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    Development Causes of the Qingyijiang River on the Northern Piedmont of the Huangshan Mountain and Its Relationship with the Channelization of the Yangtze River
    Hu Chunsheng, Tian Jingmei, He Chengbang, Zhou Yingqiu, Xu Guanglai
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1862-1872.   DOI: 10.13249/j.cnki.sgs.2021.10.018
    Abstract2705)   HTML58)    PDF (2045KB)(284)      

    The Qingyijiang River which rises on the Huangshan Mountain, flows northward through the northern piedmont of the Huangshan Mountain and eventually discharges into the Yangtze River at Wuhu City, Anhui Province, the eastern China. As the longest right-bank tributary of the lower reaches of the Yangtze River, the Qingyijiang River is a typical representative of the small and medium rivers in the Eastern monsoon area of China, providing a typical case for studying the developmental history of the small and middle rivers. Based on the results of previous studies and the analyses of external environmental factors, the development causes of the Qingyijiang River and its relationship with the channelization of the Yangtze River were emphatically analyzed and discussed. The research results showed that: 1) The Kunlun-Huanghe Movement might affect the middle and lower reaches of the Yangtze River and result in the activations of regional faults and larger regional block uplift movements on the northern piedmont of the Huangshan Mountain. This regional uplift further provided the downcutting driving force and thus drove the development of the Qingyijiang River. Therefore, the regional tectonic responses to the Kunlun-Huanghe Movement might drive the development of the Qingyijiang River; 2) The East Asian summer monsoon experienced two significant stepwise weakening events at approximately 1.3 Ma and approximately 0.9 Ma which led to the remarkable increase of regional precipitation within the study area. This increase of regional rainfall further provided the incision media and sustained water, and finally initiated the development of the Qingyijiang River. Therefore, the stepwise weakening events of the East Asian summer monsoon might control the development age of the Qingyijiang River; 3) Both the development of the Qingyijiang River and the channelization of the Yangtze River might be a combined result of the regional tectonic responses to the Kunlun-Huanghe movement and the stepwise weakening events of the East Asian summer monsoon intensity. In addition, a new local base level of erosion served by the Yangtze River after its channelization might also promote the development of the Qingyijiang River. Therefore, the development age of the Qingyijiang River which could reflect the channelization age of the Yangtze River to a certain degree supported the viewpoint that the Yangtze River had been established during the period from the late Early Pleistocene to the early Middle Pleistocene. This study provides a case and reference for the studies of the small and medium river development in the Eastern monsoon area of China.

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    Spatio-temporal Variation of Cold-season Snowfall in the South and North of the Qinling Mountains During 1970-2018
    Li Shuangshuang, Duan Keqin, Wang Ting, He Jinping, Yan Junping
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (1): 163-173.   DOI: 10.13249/j.cnki.sgs.2022.01.016
    Abstract1042)   HTML63)    PDF (29900KB)(555)      

    Snowfall in China has significant uncertainty and spatial differences, and its response to climate change is complex. Therefore, it is of great scientific significance to analyze the characteristics of snowfall along the north-south transition zone of the Qinling Mountains. Based on the daily meteorological data of 72 stations, we analyzed the type of snowfall (rain, snow, and sleet) along the northern and southern boundaries of the Qinling Mountains in the cold season (occurred from November to the following May) during 1970/1971-2018/2019. The study focuses on the spatiotemporal variation of snowfall, and the response relationship between snowfall, air temperature and wet bulb temperature was analyzed. According to the continuous change characteristics of the sea surface temperature anomaly in summer, autumn and winter Niño 3.4, we further identified the 4 types ofdifferent development El Niño-Southern Oscillation (ENSO) events to reveal that the relationships between different developing ENSO events and snowfall anomalies. The results showed that 1) Snowfall in the north and south of the Qinling Mountains showed a fluctuating deceasing trend in winter. Compared with the average snowfall in 1970-2000, there was a trend that in the south slope of the Qinling Mountains (warm temperate zone) decreased by 3.1 mm in recent 29 years, which was basically equal to the snowfall in the Guanzhong Plain (17.1 mm). 2) Considering the isoline of 1000 m as the dividing boundary, the snowfall in the low-altitude valley (<1000 m) did not show an obvious changing trend, while the snowfall in the high-altitude mountain area (>1000 m) showed a significant decrease. 3) As for the response relationship between snowfall and temperature, the air temperature or wet bulb temperature increased by 1.0℃ from November to March of the second year, and the snowfall in alpine area of the Qinling Mountains decreased by 23.1 mm and 24.3 mm respectively. However, the air temperature or wet bulb temperature increases by 1.0℃ from north to south, the snowfall decrease by 3.0 mm and 2.8 mm in zonality, respectively. 4) The analysis showed that from the perspective of disaster-forming factors, the types of ENSO events affecting the snow anomaly to the north and south of the Qinling Mountains are mainly successive El Niño events. When the successive El Niño/La Niña events occurred, anomalously more snowfall in Guanzhong Plain. When the developing La Niña events occurred, anomalously less snowfall in the Qinling and Dabashan Moutains. When the developing El Niño events occurred, the below normal snowfall in eastern of region and Guanzhong Plain.

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    Morphology and Sedimentary Characteristics of Vitex Trifolia Nebkhas in the Houtian Sandy Land of Nanchang City
    Li Xiangjie, Li Zhiwen, Du Jianhui, Zhang Huijuan, Zhan Jiangzhen, Du Lan, Sun Li, Hou Chu
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (11): 2042-2051.   DOI: 10.13249/j.cnki.sgs.2021.11.017
    Abstract836)   HTML36)    PDF (4922KB)(289)      

    In order to explore the morphology and sedimentary characteristics of the nebkhas developed around the rivers and lakes in the subtropical humid areas, the Houtian sandy land in Nanchang was used as the research area to conduct field investigations on the nebkhas formed by the dominant species Vitex trifolia, sampling and analysis of sediments to study the morphology and sedimentary characteristics of nebkhas and their relationship with vegetation characteristics. The results show that: The Vitex trifolia nebkhas in the Houtian sandy land are mostly shield-shaped, with large horizontal scale, low height, and gentle slope. The sediments of the nebkhas are mainly medium sand, with poor sorting, a coarse skewness and narrow kurtosis distribution, sediments all originate from nearby flat sandy land and inter-dune land, which are near-source deposits. The average particle size is a tendency of finer first and then coarser from the bottom of the windward slope to the leeward slope, reflecting the wind-breaking and sand-fixing function and the re-sorting of sand particles of the nebkhas. All morphological parameters of shrubs and nebkhas have high correlations (except for the height of the shrubs) (P<0.01), indicating that the morphological parameters develop in a coordinated manner during the development of nebkhas. Due to the influence of vegetation types and regional environment, different from the ellipsoid or cone-shaped nebkhas formed by upright shrubs with few branches in arid-semi-arid areas, theVitex trifolia with creeping and low height often forms low and wide range nebkhas. The subtropical humid areas are not rich in wind resources and the sand sources in Houtian sandy land are insufficient, so the sediments are all from nearby flat sandy land and inter-dune land, but the deposition law of different slope positions is similar to the arid-semi-arid areas.

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    Spatial-temporal Characteristics and Impacting Factors of Carsharing in Beijing
    Cao Kexin, Deng Yu
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1792-1801.   DOI: 10.13249/j.cnki.sgs.2021.10.011
    Abstract832)   HTML59)    PDF (10911KB)(378)      

    Taking carsharing in Beijing city as an example, we describe temporal characteristics through the coefficient of variation, characterize the spatial pattern using Moran’s I index and Getis G index, and reflect the temporal and spatial evolution through standard deviation ellipse and nuclear density analysis. On this basis, from the two dimensions of supply and demand, we selected five factors: Parking lot number, market evaluation, residence, employment activities, leisure and recreational activities, a total of 14 proxy variables, and detected the formation mechanism of space-time pattern of carsharing. The results show that: First, the distribution of carsharing has significant spatial-temporal heterogeneity, and the agglomeration centers can be divided into three types: Morning and evening gathering, daytime gathering, and even gathering. Second, the main factor of carsharing distribution is travel demand, among which leisure and entertainment places are the most important. Therefore, the government should improve the strategic position of carsharing, encourage the expansion of its scale, and distribute resources in daytime aggregation centers, leisure and entertainment places and residential areas, so as to promote the healthy development of shared transportation and provide new impetus for urban development.

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    Theoretical Basis and Methods of City Health Examination Evaluation in China
    Zhang Wenzhong
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1687-1696.   DOI: 10.13249/j.cnki.sgs.2021.10.001
    Abstract679)   HTML56)    PDF (1759KB)(323)      

    Under the new stage of urban development in China, city health examination evaluation is an important innovation in urban planning, construction and management. Not only is it an important way to promote the systematic, accurate and scientific construction of urban living environment, but also it’s an important starting point to build a healthier, safer and more livable city and provide high-quality living environment for the people. This article analyzes the theoretical basis of city health examination evaluation from the perspectives of the systematic thinking of geography, the scale economy of economics, the matching of density and space in urban planning, and the livability of cities, and puts forward the basic guidelines of city health examination evaluation. On this basis, the index design, data collection, evaluation and analysis methods and the overall technical process of city health examination evaluation are systematically constructed. And taking the dimension of convenient transportation as an example, this article makes a brief analysis of 36 pilot cities. In order to promote the high-quality development of human settlements in China, it is necessary to establish a theoretical framework and method system, and form a comprehensive and systematic evaluation system, scientific data collection means, analysis and simulation methods, diagnosis and feedback mechanism.

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    Frontier Hotspots and Development Directions of Geographical Science Research: From a Perspective of National Natural Science Foundation Application Keywords in 2021
    Gao Yang, Xiong Juhua, Wu Hao, Zhang Zhonghao, Liu Jianbao, Li Xin
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (1): 15-30.   DOI: 10.13249/j.cnki.sgs.2022.01.002
    Abstract595)   HTML41)    PDF (5188KB)(423)      

    Geographical Science is an important support for improving human understanding of the earth surface, exploring the relationship between man and land, and solving complex problems in resources, environment, development, and disasters. It is the mission and duty of the National Natural Science Foundation of China (NSFC) to lead scientific development and support the construction and cultivation of talent teams in all fields. Tracking the frontiers in the field of geographical science, optimizing the discipline layout and conducting strategic guidance are important tasks of the geographical science division of the NSFC. In this study, taking 4 479 applications in the field of geographical science of the NSFC in 2021 as samples, the word cloud analysis method was used to analyze the research hotspots of geographic science and various sub-disciplines. The results show that ‘deep learning’‘climate change’ ‘ecosystem services’‘hyperspectral remote sensing’‘Qinghai-Tibet Plateau’, and “sustainable development” are the hotspots of the research contents and methods of geographical science. In terms of intercross and fusion between sub-disciplines, the intercross of research hotspots between information geography and human geography is relatively weak, and the main common keywords are ‘spatial analysis model’ ‘geographic information system’ ‘remote sensing’, and ‘machine learning’. Hot keywords of Physical Geography and Human Geography are highly cross-integrated, and the hot common keywords include ‘ecosystem services’‘land use’‘land use change’‘sustainable development’ and ‘scenario analysis’. In the future, the NSFC-Division of Geography will start with keywords setting and interdisciplinary integration in order to further optimize the layout of Geographical Science from the strategic level, guide scientists to focus on frontier issues in Geography, and serve major national strategies such as carbon neutrality and rural revitalization.

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    The Impact of Climate Change on Grain Supply and Demand Balance in Tibet in the Future
    Ding Rui, Shi Wenjiao, Lyu Changhe, Lu Hongwei, Deng Xiangzheng, Shao Jing’an, Cui Jiaying
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (5): 772-781.   DOI: 10.13249/j.cnki.sgs.2022.05.003
    Abstract575)   HTML33)    PDF (3447KB)(176)      

    Based on the combining forecasts, production function and the author’s previous work, this article evaluated the future grain supply and demand balance of Tibet at the county scale after considering the impact of climate change. The results show that: 1) The areas with high grain production in Tibet will be concentrated in the Yarlung Zangbo River, Nyangqu River and Lhasa River Region and other river valley areas. The areas with high grain demand will be mainly in counties and cities with larger populations. Increasing meat consumption in the future will consume more feed grain. 2) The grain supply and demand balance in Tibet will have obvious geographic differences between the north and the south. It will be relatively satisfying in the south, but will be relatively terrible in the north. 3) At current status, the gain self-sufficiency ratio of Tibet is 70.58%, failing to achieve an overall balance between grain supply and demand, and it will be 62.59% and 53.55% in 2030 and 2050. Although the total grain demand cannot be completely met in the future, it can still guarantee staple grain self-sufficiency. 4) Climate change will have a positive impact on the grain self-sufficiency. It is estimated that in 2030 and 2050, climate change will increase the self-sufficiency ratio by 2.45% and 2.09% in Tibet. This study can help clarify future food security status and develop the agricultural layout in Tibet, thus ensuring food security in this border area and promoting sustainable development of the plateau agriculture.

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    The Processes of Prehistoric Human Activities in the Tibetan Plateau: Occupation, Adaptation and Permanent Settlement
    Chen Fahu, Xia Huan, Gao Yu, Zhang Dongju, Yang Xiaoyang, Dong Guanghui
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (1): 1-14.   DOI: 10.13249/j.cnki.sgs.2022.01.001
    Abstract526)   HTML68)    PDF (2098KB)(519)      

    The history of human activities on the Tibetan Plateau is crucial for understanding human adaptation to the extreme environment of cold and hypoxia. This paper systematically reviews the archaeological discoveries and studies in recent years, and provides an overview of five development stages of prehistoric human colonization of the Tibetan Plateau from the known of the earliest occupation until permanent settlement. 1) The Denisovan mandible and mitochondrial deoxyribonucleic acid (mtDNA) found in Baishiya Karst Cave (BKC), 3 280 m above sea level ( a.s.l.), on the northeastern Tibetan Plateau, indicate that the ArchaicHomo sapiens, such as Xiahe Denisovan, may have adapted to the plateau at least 190 thousand years ago (ka) during the late Middle Pleistocene and long-term existed in and around the BKC until the last Glacial period; 2) The Initial Upper Paleolithic assemblages, from excavations at Nwya Devu site (4 600 m a.s.l.), reveal that modern humans began to explore the interior region of the Tibetan Plateau as early as 40-30 ka; 3) The relatively rich microlithic sites on the plateau from last deglaciation to early-mid Holocene, show the frequent activities of microlithic hunt-gatherers during this period, especially during 0.9-0.6 ka, perhaps the results of climate warming; 4) According to the evidence of plant remains from the Neolithic sites, millet farmers have entered low-elevation regions (< 2 500 m a.s.l.) on eastern Tibetan Plateau at least 5.2 ka, and permanently settled in regions at elevation above 3 000 m a.s.l. on eastern Tibetan Plateau since 4.8 ka; 5) After 3.5 ka, the introduction and development of wheat and pastoral economy facilitated permanent human occupation in the high-altitude regions (> 3000 m a.s.l.) of the Tibetan Plateau, which is a consequence of cultural exchange in prehistoric Eurasia. These reflect the long-term physiological and cultural adaptation of prehistoric humans in the process of spreading and settling on the plateau. However, our understanding of prehistoric human activities on the plateau is still limited by the number of archaeological sites and excavated materials. Therefore, we suggest that future work should be focused on seeking more prehistoric sites, conducting the systematic study, and solving the following issues: the spatial and temporal distribution of prehistoric hunter-gatherers, farmers and herders on the plateau, their biological and behavioural adaptation to high-altitude environment and connection with prehistoric low-altitude population and modern Tibetans, and the formation and universality of alpine civilization. We expect that new discoveries and multidisciplinary endeavours will promote the understanding of these issues in the future.

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    Hazard Intensity of Rainstorm Affecting High-speed Railway Operation in China
    Li Ying, Gao Ge, Cheng Chi
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1843-1851.   DOI: 10.13249/j.cnki.sgs.2021.10.016
    Abstract502)   HTML11)    PDF (8943KB)(109)      

    Using the hourly national rain-gauge datasets over China, based on the weather conditions affecting the operation of high-speed railway, the risk of rainstorm to the operation of high-speed railway in China (excluding data of Hong Kong, Macao and Taiwan) is analyzed. Rainstorms that have adversely affected high-speed rail operations occur over a wide range of areas over China concentrating in the central and eastern China and the northeastern China, which highly overlaps the current high-speed railway network, thus leads to a high risk to its operation. From May to October, the average frequency of rainstorm which has negative impact on the high-speed railway gradually decreases from south to north or to west. It occurs frequently in South China, with 5 hours in each year in general and more than 10 hours in each year in southeast coastal and Hainan areas. The unfavorable operating conditions mainly occur in July, and the influencing domain of unfavorable weather conditions for high-speed railway operation is consistent with the prevailing movement of rain belt in China as well as the typhoon activity. In terms of diurnal variation, rainstorms with negative impacts on high-speed railway are frequent in the early morning and early evening, with the peak value at 17:00 and the widest distribution range from 14:00 to 21:00, which mainly concentrates in South China, most parts of Jiangnan, northeastern China, North China, Hainan and the western Sichuan. The unfavorable operation conditions of continuous rainstorm are common in the eastern part of China. The longest continuous adverse rainfall in history appears in the most extensive range with 3 hours. The longest continuous adverse rainfall duration is more than 6 hours in southwest Guangdong, south Guangxi and Hainan. The central and eastern parts of China are prone to medium risk in rainstorms. The eastern part of North China and most areas south of the Qinling Mountains and the lower reaches of the Yellow River are relatively high risk prone areas. Western Guangdong, Guangxi, Hainan and parts of the southeast coastal areas are high risk prone areas.

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    Spatial Distribution Characteristics and Influencing Factors of China’s Beautiful Leisure Villages
    Wang Zhaofeng, Shi Weijie
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (1): 104-114.   DOI: 10.13249/j.cnki.sgs.2022.01.010
    Abstract459)   HTML55)    PDF (3639KB)(404)      

    In this article, the average nearest neighbor and kernel density method are used to analyze the spatial layout of beautiful leisure villages. Besides, the entropy weighting method, geographic detector, and neighborhood analysis are employed to explore its influencing factors. The results show that: 1) On the national scale, the beautiful leisure villages are unevenly distributed in space, and the overall distribution is concentrated, forming the spatial characteristics of ‘two poles and multi-core’. 2) On the provincial scale, the density of beautiful leisure villages in the eastern coastal provinces is relatively high while the density in the high-latitude and high-altitude provinces of the western part is relatively low. With the exception of Qinghai and Tibet, the distribution of beautiful and leisure villages in various provinces presents small differences; the degree of agglomeration is low and tends to be evenly distributed. The beautiful leisure villages in Beijing and Tianjin have the best development in space. 3) Beautiful leisure villages are significantly influenced by human factors, such as rural basic conditions, tourism investment level, tourism market scale and national cultural resources. Its natural distribution tends to be in the warm and humid climate areas with the altitude lower than 200 m, near third-level rivers, excellent environmental quality, and close to cities or scenic spots with annual accumulated temperature higher than 3 400℃ or precipitation higher than 400 mm.

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    Spatial Dynamic Evolution Characteristics of Ecological Immigrant Community in Minning Town, Ningxia
    Zhao Duoping, Zhao Weiyi, Huang Fengping, Tian Weirong, Cao Lanzhou
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1812-1821.   DOI: 10.13249/j.cnki.sgs.2021.10.013
    Abstract449)   HTML15)    PDF (6372KB)(140)      

    Community space evolution is one of the hot topics in academic circles in recent years. In this artical, we studied the space dynamic evolution characteristics of ecological immigrant communities and influencing factors in Minning town, Ningxia by using the principle of community social dynamic evolution Clique Percolation Method, and using superposition method, questionnaire method and interview method. The results show that: 1) The main types of spatial evolution events of ecological immigrant communities are merging, growing, continuing and forming. The influencing factors include policy, natural environment, industrial development and geographical relationship. 2) The evolution characteristics are that the community space changes from scattered to concentrated, and that the spatial form changes from irregular patches to regular geometric figures. The evolution process of the community space is in a state of positive evolution and conforms to the characteristics of Chinese national distribution. 3) It indicates that the spatial evolution of ecological migration community is gradually rationalized, which is conducive to management, infrastructure construction and resource allocation. The support of national policy can make the development of ecological immigrant community more vitality and attract more immigrants. It is of great significance to the construction and development of ecological immigrant communities.

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    Spatial Evolution and Influencing Factors of Spatial Agglomeration Pattern of Air Pollution in the Yellow River Basin
    Teng Tangwei, Chen Danhua, Hu Senlin
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1852-1861.   DOI: 10.13249/j.cnki.sgs.2021.10.017
    Abstract446)   HTML38)    PDF (863KB)(408)      

    The Yellow River Basin plays a very important strategic role in China’s economic and social development and ecological security. Based on the air pollution data of industrial SO2 and PM2.5 in the Yellow River Basin from 2008 to 2017, this article firstly describes the spatial evolution pattern of industrial SO2 and PM2.5 and then uses the spatial panel Durbin model (SPDM) to compare and analyze the influencing factors of the two types of atmospheric pollutants from the direct and indirect effects. The results are as follows: 1) Both industrial SO2 and PM2.5 pollution have significant spatial agglomeration which shows a gradient decline trend from southeast to northwest direction. There is a significant positive spatial correlation between industrial SO2 and PM2.5 from the prefecture-level city scale while the spatial correlation of PM2.5 is stronger the that of industrial SO2. 2) The pollution of industrial SO2 and PM2.5 had been alleviated from 2008 to 2017. The average emission intensity of industrial SO2 decreased rapidly while the average PM2.5 decreased relatively slowly. PM2.5 is still the main air pollution source in the Yellow River Basin. 3) The optimization of the industrial structure (OIS), energy efficiency (EE), technological innovation (Inno), population (POP), economic development (pcGDP), and industrial scale (Ind) are the main factors affecting air pollution in the Yellow River Basin. However, the influencing factors of PM2.5 are more complex and diverse. The improvement of technological innovation and economic development will increase the emission intensity of local SO2 pollution while it can alleviate the pollution of industrial SO2 and PM2.5 in neighboring cities. The expansion of industrial scale aggravates air pollution both locally and in neighboring cities during the study period (2008-2017). Therefore, this article proposes policy recommendations from 3 aspects: improving the city’s innovation capability, accelerating the upgrading of the industrial structure and strengthening joint prevention and control.

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    Build the Community of Life for Man and Nature Based on Life Practice: A Case Study of Xiawu Village in Tibet
    Sun Jiuxia, Wang Yuning, Pang Zhaoling
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (5): 751-760.   DOI: 10.13249/j.cnki.sgs.2022.05.001
    Abstract444)   HTML44)    PDF (977KB)(231)      

    The relationship between human and nature is a central topic of geography, and a major problem in the development of human society. In the report of the 19th National Congress of the Communist Party of China, Xi Jinping clearly put forward the important thesis of ‘Human and Natural Life Community’. How to implement the public policy discourse into the concrete action practice depends on scholars’ empirical analysis on typical cases. The previous studies on the relationship between human and nature usually take individual or family as the analysis unit, discussing the interaction between the individual or family and the specific type of natural object. Relatively little works have been done dissecting how the relationship between human and nature in specific regions are constructed. Taking Xiawu Village in Tibet as a case study, field investigations were carried out for villagers and government workers based on qualitative methods such as semi-structured interviews and participatory observation. This paper examines the relationship between local society and nature, and analyzes how to construct the community of life for human and nature from the perspective of daily life practice. The findings are as follows: 1) When Tibetan villagers interact with highland barley (Hordeum vulgare var. coeleste) and cattle, they connect with the latter through multiple life practice strategies, such as material, emotion, space and identity transformation. Through the practice of man’s naturalization, a representational community of life for human and nature is constructed. At this time, highland barley and cattle, as instrumental nature, are the physical representation of the villagers, narrating the daily life when human actors are absent. 2) When Tibetan villagers interact with Cordyceps and Macaca, they conn-ect with the latter by means of life practice strategies such as meaning, system, and space negotiation. Through the practice of humanization of nature, a linked community of life for human and nature is constructed. At this time, Cordyceps and Macaques, as objectified nature, were constructed by society, given social life, and gradually embedded in human’s daily life.

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    High-quality Development Spatio-temporal Evolution of Industry in Urban Agglomeration of the Yellow River Basin
    Li Linshan, Zhao Hongbo, Guo Fuyou, Wang Yu
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1751-1762.   DOI: 10.13249/j.cnki.sgs.2021.10.007
    Abstract442)   HTML35)    PDF (1231KB)(283)      

    The Yellow River Basin is an important ecological barrier and an important economic zone in China, with a good industrial base and huge market potential. Taking the urban agglomeration in the Yellow River Basin as the research space unit, the article identified the connotation of high-quality development of the industry in the basin through literature review, so as to build an index system of industrial high-quality development, and analyzed the spatio-temporal process of industrial high-quality development in the urban agglomeration in the Yellow River Basin. Research shows that: 1) the overall level of industrial high-quality development of urban agglomeration in the Yellow River basin is rising, and presents obvious spatial differentiation characteristics. The closer it is to the downstream, the higher the index of high-quality industrial development will be. 2) The development indexes of each industrial dimension shows different spatial characteristics. In terms of industrial vitality and innovation efficiency, there are obvious differences between upper, middle and lower reaches. There are different industrial structural problems for different urban agglomerations. The industrial spatial connection of urban agglomeration in the upper and middle reaches is insufficient, and the gap with the middle and lower reaches urban agglomeration is expanding. The pressure of ecological environment brought by industrial development of various urban agglomerations tends to aggravate, and the urban agglomeration in the middle reaches of the Yellow River Basin has become the high value area of environmental pollution. There are greatly different in the comprehensive level of high-quality industrial development and the sub-index of various dimensions in all urban agglomerations in the Yellow River Basin. These differences are formed under the comprehensive role of different location conditions and historical bases, urban agglomeration spatial structure, industrial structure, industrial spatial connection pattern, and national and local industrial policies.

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    Effects of Urban Spatial Morphology on Urban Heat Island Effect from Multi-spatial Scales Perspectives
    Huang Qunfang
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1832-1842.   DOI: 10.13249/j.cnki.sgs.2021.10.015
    Abstract419)   HTML38)    PDF (520KB)(450)      

    With the rapid development of global urbanization, the further increased global warming and extreme high temperature events, urban heat island effect has also become an important environmental problem affecting human survival and development in the 21st century. Therefore, it is a hot and frontier cross-scientific issue in the study of human geography and climatology to clarify the spatio-temporal variations of urban heat island intensity and reveal the driving mechanism at multi-spatial scales. Urban geometry is regarded as a key factor affecting urban-rural and intra-urban air temperature variations, and the urban form manipulation provides an opportunity to mitigate the adverse effects on urban climate. Therefore, it is critical to understand the relationship between urban form and the UHI effect to guide future planning practice. This paper systematically reviews and summarizes the multi-scale affecting and coupling mechanism of urban spatial morphology on urban heat island intensity from three different spatial scale perspectives including street canyons microscale, urban block local scale, and urban macroscale. Based on the understanding of the spatial distribution and temporal evolution characteristics of urban spatial morphology on urban heat island intensity, we will characterize the specific effects of urban spatial morphology on urban heat island intensity and construct the spatial relationship analysis model to reveal the affecting mechanism of urban spatial morphology on urban heat island intensity at different temporal and spatial scales. Our knowledge and insights will provide theoretical guidance for urban planning, livable city construction and climate change response and adaptation study.

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    The Spatio-temporal Evolution and Mechanism of the Coordination Between Quality and Quantity of Economic Growth in Chinese Urban Agglomerations
    Zhang Guojun, Wang Yunzhe, Wang Juehan, Cao Yongwang, Zhou Chunshan
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (12): 2075-2086.   DOI: 10.13249/j.cnki.sgs.2021.12.001
    Abstract419)   HTML51)    PDF (1228KB)(385)      

    The aticle sets urban agglomerations which the Chinese 13th Five-year Plan outline referred to as the research objects, respectively from the economic efficiency, economic structure, economic stability, economic development potential, results distribution, resources and environment, the welfare of the people’s livelihood seven dimensions of urban agglomeration economy growth quality characterization, from growth rate of GDP and per capita GDP of two dimension depicting economic growth to build a comprehensive index system. Using the methods of entropy value method, coupling coordination model, geodetector and so on, we analyze the coupling coordination between quality and quantity of economic growth in China from 2006 to 2018 and its interaction mechanism. The results showed that: 1) As for the overall level, the coordination degree between quality and quantity of economic growth in China's urban agglomerations is low, and shows a downward trend; 2) In terms of the spatial pattern of coordination degree, the spatial pattern of the quality of economic growth with the quantity of economic growth and the speed of economic growth showed a trend of “high in the east and low in the west” and remained relatively stable, but the spatial pattern of coordination degree of the quality and scale of economic growth changed greatly; 3) In terms of coordination types, the “quantity lag” type distributed sporadically, the “scale lag” type is concentrated in the central and western regions, the “speed lag” type is expanded in the northeast, and the “quality lag” type showed diversity due to the different coordination objects; 4) The coordination among the quality of economic growth and the scale of economic growth and speed of economic growth shows a feature of not accordance; 5) The analysis of mutual coordination mechanism shows that the welfare of the people’s livelihood, economic development potential and per capita GDP have a significant and important influence on the improvement of the coordination level of economic growth quality and quantity in 19 China’s urban agglomerations; 6) It explains the key measures to be taken by different coordinated urban agglomerations, so as to help the high-quality economic development of 19 China’s urban agglomerations.

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    City Health Examination: New Response of Spatial Governance in Pattern, Methodology and Technology
    Shi Xiaodong, Yang Ming, Wang Jili
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1697-1705.   DOI: 10.13249/j.cnki.sgs.2021.10.002
    Abstract416)   HTML20)    PDF (4682KB)(224)      

    City health examination is an important policy tool to promote the improvement of spatial governance system and governance capacity. It will help to implement national development strategy, improve the level of comprehensive urban governance, and effectively respond to the needs of people’s better life. This article summarizes the experience of Beijing, holds that city health examination provides a new way of response to the improvement of spatial governance from 3 dimensions: pattern, method and technology. Pattern dimension, focusing on the establishment of regulations, has formed a closed-loop work system, a working mode contains self-evaluation, third-party-evaluation and public participation, an normalized data acquisition system, which strengthens the seriousness and authority of health examination evaluation. Methodology dimension, the research system focuses on index, task and different important issues, which is connected with the overall planning implementation mechanism process. Technology dimension, with the actively use of a multi-dimensional, multi-level, all-factor, multi-agent, speculative and verifiable diagnostic ideas, Beijing’s work constantly deepens the key technologies of city health examination. In order to optimize spatial governance, we should continuously improve the city health examination practice, including continuously strengthening its ability in institutionalization, simplification, standardization and automation. First, we should continuously improve multidimensional data acquisition and monitoring. On the basis of continuing the collection of 117 core indicators in the master plan, the evaluation should meet the requirements of the Ministry of Natural Resources and the Ministry of Housing and Urban-Rural Development for city health examination, and integrate the relevant index system into the platform. Second, we should further focus on key issues and annual key variables in urban development. “Annual health examination and five-year evaluation” has established the periodicity of work, focusing on different work priorities and forming an organic combination. Third, we should improve the intelligent analysis platform of city health examination. Focusing on the needs of supporting the whole cycle of city health examination in Beijing, an analysis platform with multi-dimensional monitoring, automatic operation and decision-making needs has been established. In the next step, we should continue to improve the construction and application of the platform, and promote more accurate response of the platform and decision-making needs.

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    The Impact of Aerosols on Daytime Urban Heat Island Intensity in Guangdong-Hong Kong-Macao Greater Bay Area
    Deng Yujiao, Wang Jiechun, Hong Yingying, Tan Haobo, Chen Jingyang, Xiang Kunlun
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (12): 2213-2221.   DOI: 10.13249/j.cnki.sgs.2021.12.015
    Abstract410)   HTML30)    PDF (9465KB)(294)      

    Both of urban heat island effect and particulate pollution are hot social issues during the construction of Guangdong-Hong Kong-Macao Greater Bay Area. Taking Guangdong-Hong Kong-Macao Greater Bay Area as an example, the article analyzed change rules of urban heat island intensity (UHII) and aerosol optical depth (AOD), and the relationship between them based on satellite remote sensing data from 2003 to 2018. Then the change of UHII with the presence and absence of aerosols were simulated based on WRF-Chem, and the influence of aerosols on UHII in daytime was quantitatively studied. The results showed that UHII in Guangdong-Hong Kong -Macao Bay area fluctuated upwardly in the past 16 years, with the seasonal maximum in summer, and the seasonal minimum in winter. The maximum months were June and July, and the minimum month was February. The AOD fluctuated downwardly in the past 16 years, with the seasonal maximum in spring and the seasonal minimum in winter. The maximum month was April, and the minimum month was November. There was a weak positive correlation between UHII and difference of AOD between urban areas and rural areas on the interannual and seasonal scales. The simulation experiments based on WRF-Chem showed that the existence of aerosols led to the decreases of downward total radiation at ground surface and land surface temperature in urban and rural areas. Because the decrease of downward total radiation at ground surface in urban areas was more than that in rural areas, the cooling effect was greater than that in rural areas, which led to the weakening of UHII. The contribution percentage of aerosols to UHII was ?2.187%, and the absolute value of contribution percentage in winter was slightly higher than that in summer.

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    Spatio-temporal Evolution and Influencing Factors of Economic Resilience in the Yellow River Basin
    Li Liangang, Zhang Pingyu, Cheng Yu, Wang Chengxin
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (4): 557-567.   DOI: 10.13249/j.cnki.sgs.2022.04.001
    Abstract400)   HTML42)    PDF (1696KB)(249)      

    The economic resilience of the Yellow River Basin in response to external shocks is the key to achieving the national strategy of ecological protection and high-quality development of the Yellow River Basin. We takes 91 cities in the Yellow River Basin as the research object and constructs an economic resilience index. The article analyzes the spatio-temporal characteristics of the economic resilience of the Yellow River Basin in the face of the 2008 international financial crisis, and explores its determinants. The results show that: 1) The resistance of the Yellow River Basin to the international financial crisis shows a significant decline over time, the economic resilience of the Yellow River Basin shows significant spatial agglomeration characteristics, and the economic resilience level of the south central part of the Yellow River Basin is relatively high; 2) There is a significant positive spatial autocorrelation in the economic resilience of the Yellow River Basin, which shows that cities with high (low) level of economic resilience are clustered in space, and the spatial autocorrelation index shows an upward trend; 3) Related variety, specialization, government control and the proportion of tertiary industry significantly promote the improvement of economic resilience in the Yellow River Basin, while the current economic development model is not conducive to the improvement of economic resilience; 4) The economic resilience of the Yellow River Basin has a significant spatial spillover effect, and the development of cities with high economic resilience level will promote the economic resilience of surrounding cities.

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    The Spatial Pattern and Distribution Dynamic Evolution of Carbon Emissions in China: Empirical Study Based on County Carbon Emission Data
    Liu Huajun, Shao Mingji, Ji Yuanmeng
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (11): 1917-1924.   DOI: 10.13249/j.cnki.sgs.2021.11.005
    Abstract390)   HTML33)    PDF (3967KB)(204)      

    Clarifying the spatial distribution, spatial differences and evolutionary trends of China’s carbon emissions has important reference value for grasping the basic situation of China’s carbon emissions and formulating a carbon peak action plan before 2030. Based on the carbon emission data of 2725 counties in China from 1997 to 2017, this paper uses standard deviation ellipse, three-stage nested inequality decomposition by Theil index and Kernel density estimation methods to comprehensively investigate the spatial pattern and dynamic evolution of China’s carbon emissions. The study found that: 1) China’s carbon emissions increased from 3.097 billion tons in 1997 to 9.308 billion tons in 2012, with an average annual growth rate of 7.86%, and then fluctuated around 9.3 billion tons, without a turning point in decline. 2) In terms of spatial distribution, China’s carbon emissions present a pattern of high in the east and low in the west, showing a trend of centripetal accumulation in the northeast-southwest direction and spatial divergence in the northwest-southeast direction. 3) In terms of spatial differences, the three-stage decomposition results of Theil index show that the overall difference in carbon emissions in China is on a downward trend, and the contribution rate of differences within prefecture-level administrative units has increased from 43% in 1997 to 49% in 2017. The main source of overall differences in China’s carbon emissions. 4) In terms of the dynamic evolution of the distribution, the carbon emissions of China’s county-level units have a spatial convergence pattern, with significant spatial positive correlation, indicating that the interaction between regions affects the future spatial distribution of China’s carbon emissions. Based on research findings, this article proposes to adjust the energy industry structure, promote the development of low-carbon industries, formulate reasonable regional joint prevention and control policies for carbon emission reduction, and establish a sound carbon trading market.

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    Theoretical Exploration of Innovative Talent Agglomeration: From the Perspective of City Selection of Global Talent Flow
    Jiang Yanpeng, Wang Xinjing, Ma Renfeng
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1802-1811.   DOI: 10.13249/j.cnki.sgs.2021.10.012
    Abstract380)   HTML19)    PDF (1066KB)(131)      

    The human-economic geography attaches great importance to the study of the location law of geographical things, and the classical location theory has shifted from industrial location to urban location, and finally to the location of innovation activities. However, People are the main body of innovation, and the research on the location of innovative talents is one of the hotspots and difficulties in the field of geography, regional science and economics, the efficiency of the flow of innovative talents and the degree of their spatial agglomeration have become important indicators to measure the global competitiveness of a country or region. To this end, this study systematically sorts out the multi-scale location selection of innovative talents and their spatial agglomeration literature in urban agglomeration, summarizes the classification of innovative talents and the theoretical targets of their heterogeneous location selection, explores the flow of global talents and full picture of urban agglomeration, and analyses the logic related to the flow of innovative talents, location selection and sustainable development of urban agglomerations, and builds an exploratory framework for the location selection and spatial agglomeration analysis of innovative talents in urban agglomerations. It reveals the influence mechanism of the location selection of innovative talents and their spatial agglomeration, and then puts forward the research prospect of innovative talents aggregation in urban agglomeration under the background of deepening division of labor and heterogeneity of talents and attempts to provide reference for China's talents policy practice.

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    Spatial Distribution and Functional Evolution of Shipping Service Industry in Shanghai
    Jiang Shuhua, Jiao Huafu, Guan Jing
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1783-1791.   DOI: 10.13249/j.cnki.sgs.2021.10.010
    Abstract379)   HTML17)    PDF (1381KB)(193)      

    The shipping service industry is not only the focus for Shanghai to build an international shipping center, but also an important industry to participate in the global city competition. Based on the data of shipping service enterprises (organization) in 1992, 2005 and 2019, this paper studies the spatial distribution and functional evolution of shipping service industry by means of weighted Kernel density analysis, nearest neighbor index and keyword co-occurance analysis. The results show that the distribution mode of the shipping service industry in Shanghai tends to aggregate as whole. The evolution of the spatial distribution has changed from the contiguous distribution along the urban rivers to the multi location and multi-core of industrial parks, ports and urban CBD. From the perspective of the functional evolution of shipping service industry, the composition of important function units is stable, and warehousing has occupied the first place. Emerging function units switch frequently, the burst strength of container transportation, e-commerce and ship techniques are high. At present, seven function unit clusters have formed, which are climbing along the value chain. Traditional port and shipping industry, financial industry and information industry are the key hub industries to connect clusters. Function diversification has a heterogeneous demand for resource bundles, and the spatial distribution of resources is not balanced. The dynamic adjustment and matching of the both is the fundamental reason for the formation of spatial distribution and functional evolution.

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    New Mechanisms and Approaches for Modernizing Urban Governance from the Perspective of City Health Examination
    Zhan Meixu, Liu Qianqian, Huang Xu, Li Wan, Wang Jianjun
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1718-1728.   DOI: 10.13249/j.cnki.sgs.2021.10.004
    Abstract372)   HTML10)    PDF (1948KB)(195)      

    As a new form of urban governance, city health examination is a product of the spatial and temporal evolution of social conflicts in an open and complex system. It uses the technical method of ‘problem diagnosis’ to evaluate and dynamically monitor the current state of urban development, and has become a grip for China’s urban planning and construction management and a platform for mobilizing public participation in urban construction. At present, the research and practice related to city health examination is still weak, and there are still problems such as inadequate understanding of the connotation, insufficient social participation, unstable indicator system, inaccurate problem diagnosis, lack of in-depth problem management and imperfect long-term mechanism. In response to these problems, this article examines new mechanisms and ways to achieve urban governance, starting from governance relationships, governance systems and governance techniques, and taking Guangzhou as a case study. It first explores a new model of city health examination governance, and specifies a standardized organizational model of city health examination that covers the vertical transmission and horizontal linkage of administrative bodies at 4 levels: ‘city→district→town/street→community’. Based on this organizational model, this article constructs a governance framework in which administrative forces lead, social forces participate, and urban self-governance forces are stimulated. Secondly, this article proposes a four-step process of ‘indicator design→consultation→selection of indicators→confirmation of indicators’ to improve the city health examination indicator system, and proposes a standardized and modularized approach to data collection. In particular, the evaluation of indicators in the city health examination should adhere to the principles of multidimensionality, variability and the combination of quantitative and qualitative aspects, and use the six-dimensional analysis method as the basis for identifying and diagnosing urban problems. On the premise of scientifically and reasonably classifying the types of urban problems, the city health examination can help to prescribe the right remedy for urban problems and apply precise measures. In addition, the public participation process of the city health examination needs to fully reflect the citizens’ right to information, participation and supervision. This is demonstrated by the need for the city government to build a regular, shared governance platform with in-depth citizen participation; the need for problem-oriented, collaborative, full-cycle systemic governance by various departments; and the promotion of a regular working mechanism for the whole society to build and share common governance. Overall, the city check-up thus reflects a high degree of consensus on governance goals, efficient and interactive governance, and optimal system construction and use capabilities, and is an important sign of modernized governance capacity.

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    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1873-1874.   DOI: 10.13249/j.cnki.sgs.2021.10.019
    Abstract372)   HTML19)    PDF (1534KB)(129)      
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    Economic Transformation Process of Old Industrial Bases from the Perspective of Regional Economic Resilience: A Case Study of Liaoning Province
    Li Liangang, Zhang Pingyu, Wang Chengxin, Cheng Yu
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1742-1750.   DOI: 10.13249/j.cnki.sgs.2021.10.006
    Abstract369)   HTML15)    PDF (1479KB)(184)      

    Regional economic resilience provides a new perspective and framework for analyzing the process and law of economic transformation of old industrial bases. The paper analyzes the economic transformation process of Liaoning old industrial base from 2003 to 2018 by constructing the economic transformation analysis framework from the perspective of regional economic resilience, and discusses the evolution process and stage characteristics of Liaoning’s economic transformation. The results show that: 1) The effect of Liaoning’s economic transformation showed an upward trend of fluctuations, with the highest level of pressure resistance but a downward trend, and the lowest level of breakthrough potential. 2) The process of Liaoning’s economic transformation shows cyclical characteristics. It is currently in the reorganization-development period, and the next stage will enter the maintenance-release period. 3) The pressure resistance level of the Liaoning old industrial base has obvious spatial differentiation between the east and the west. The dynamic adaptation level has obvious agglomeration characteristics in central area, and the eastern region has a low level of potential breakthrough. 4) The Liaoning’s economic transformation effect presents a spatial pattern of high in the middle and low on both sides, and regions with similar effects of economic transformation are clustered significantly. According to the law and characteristics of the old industrial bases economic transformation, the paper puts forward the countermeasures and suggestions for the future transformation and development.

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    Impact of Urban Population Density on Perception of Human Settlements in Hangzhou
    Xu Jingxue, Zhang Wenzhong, Chen Li
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (2): 208-218.   DOI: 10.13249/j.cnki.sgs.2022.02.003
    Abstract369)   HTML29)    PDF (700KB)(177)      

    The study of the nonlinear relationship between population density and human settlement environment perception is of great practical significance for the rational control of the size of big cities, the formulation of appropriate population density control standards and the scientific development of urbanization. Taking Hangzhou as a case city, based on the results of the social satisfaction questionnaire of “city health examination” of the Ministry of housing and urban rural development in 2020 and the spatial data of Hangzhou urban built environment, this paper analyzes the nonlinear relationship between population density and residents’ perception of ecological livability, health and comfort, and transportation convenience by using three-stage stepwise regression model and intermediary effect test, It also analyzes the influence path of population density on the perception of human settlements in different dimensions. The results show that: there is a significant inverted U-shaped correlation between population density and residents’ perception of ecological livability, health and comfort, and transportation convenience. When the population density is between 15 000 persons/km2 and 20 000 persons /km2, residents’ perception of these three dimensions is the best; In the aspect of impact path, the impact path of population density on Residents’ perception of ecological livability is partial intermediary, and the impact path of population density on Residents’ perception of health and comfort and traffic convenience is complete intermediary. The research can not only deepen the understanding of compact city theory, but also provide the corresponding decision-making basis for Hangzhou urban planning, and promote the healthy and orderly development of new urbanization.

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    Reconstructing the Theory of Cross-border Governance: Taking the Yangtze River Delta as a Case
    Ye Chao, Zhao Jiangnan, Zhang Qingyuan, Yu Jie
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (3): 363-372.   DOI: 10.13249/j.cnki.sgs.2022.03.001
    Abstract365)   HTML289)    PDF (6909KB)(276)      

    The world has entered an era of hypermobility and instability. National and social governance is facing enormous new challenges. With the rapid urbanization, the free flow of factors frequently cross borders. Governance needs to transform instability into stability, which highlights the importance of cross-border governance. The interweaving of global, regional and local scales has brought new issues of cross-border governance. Cross-border governance mainly refers to the process of making multiple subjects participate in and jointly govern public affairs through cross-region, cross-department, cross-level and cross-field. By sorting out the relevant theories of cross-border governance, this article redefines the “border”, reconstructs the theoretical logic of cross-border governance, and proposes that cross-border governance mainly involves three pairs of key categories of three scales: Heterogenization and homogenization at the local scale; deborderlization and borderlization at the regional scale; decentralization and centralization at the global scale. Taking the Yangtze River Delta as a case study, this article empirically analyzes the logic of cross-border governance at regional scale.

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    Dynamic Regional Manufacturing Agglomeration in the Yangtze River Delta Region
    Kang Jiangjiang, Xu Wei, Ning Yuemin
    SCIENTIA GEOGRAPHICA SINICA    2021, 41 (10): 1773-1782.   DOI: 10.13249/j.cnki.sgs.2021.10.009
    Abstract360)   HTML19)    PDF (1238KB)(189)      

    This article proposes a theoretical framework composed of the effects of localization, urbanization and globalization to explain the evolution of regional manufacturing agglomeration in the Yangtze River Delta region. Further, based on the micro firm-level data from industrial enterprise database in China, using regional manufacturing agglomeration index as a measure index, this paper first described the spatial characters of manufacturing at the county level in the Yangtze River Delta region from 2000 to 2013, and then using the panel data model to measure the effects of localization, urbanization and globalization on manufacturing industry agglomeration. The results are as follows. Firstly, the manufacturing industry is highly concentrated at the region of South Jiangsu, Shanghai and Hangzhou-Shaoxing-Ningbo and changes little over time, and the manufacturing industry status in the north of Jiangsu and south west of Zhejiang has been improved. Secondly, the variables of wage and industrial development zones have a significant positive effect on the manufacturing agglomeration, while the variable of land price has a significant negative effect, and the effect of market and transportation are inconclusive. The urbanization factors, such as city size, urbanization rate, migration and urban manufacturing diversification, all show significant positive promoting effects, indicating that the urbanization will promote the level of manufacturing agglomeration in the Yangtze River Delta region. Globalization shows different directions, which FDI has a significant negative impact on the manufacturing agglomeration, and the variable of foreign capital is also negative, indicating that foreign investment is not conducive to the improvement of the manufacturing agglomeration level. Exports show a positive effect, but it is inconclusive.

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    Organic Integration and Application of Multi-source Data in City Health Examination: A Case of Beijing
    He Ju, Zhang Wenzhong, Cao Jing, Chen Li
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (2): 185-197.   DOI: 10.13249/j.cnki.sgs.2022.02.001
    Abstract358)   HTML45)    PDF (9734KB)(157)      

    Multi-source data is an important foundation and support for city research in the current information age. It is also a key research direction of geography and urban planning. City Health Examination is a new proposition under the background of high-quality city development. The organic fusion and scientific application of multi-source data in city health examination are crucial for the in-depth analysis of city problems and the exploration of their impact mechanisms. Starting from combing the application of subjective and objective data in existing city research, it combines the national city health examination in 2019 and 2020 and the practical work of Beijing city health examination in 2018, 2019 and 2020. And explores the application of multi-source data in different spatial scales (city-district-street-community), different time scales (year-month-day-hour) and different city health examination dimensions (convenient, inclusive, healthy, orderly, characteristic, safe, livable and dynamic). It points out the scientificity, timeliness, dynamics and refinement of objective data, and recognizes the advantages of strong sample representativeness, strong pertinence and easy processing of subjective data. Finally, this paper proposes the organic integration of multi-source data represented by objective data and subjective data, and shows the case of "urban parking problem in Beijing", which empirically shows the complementarity and combination of different types of data in city health examination research. This paper hopes to provide suggestions for the improvement of data application methods in city health examination, and provide ideas for the research and development of city health examination.

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    Spatial and Temporal Characteristics of Water Bodies Occupied by Global Urban Land Expansion from 1986 to 2015 Based on GEE and Remote Sensing Big Data
    Feng Kaidong, Mao Dehua, Wang Zongming, Pu Haiguang, Du Baojia, Qiu Zhiqiang
    SCIENTIA GEOGRAPHICA SINICA    2022, 42 (1): 143-151.   DOI: 10.13249/j.cnki.sgs.2022.01.014
    Abstract353)   HTML35)    PDF (4012KB)(275)      

    Due to the increase of global population and economic development, the water body inside of the cities and its surroundings has been continuously occupied since the 1970s, causing serious damage to ecological environment. Thus, it is very important to estimate the condition of water body occupied by urban land expansion around the world. With the data processing and analysis functions of the Google Earth Engine cloud platform (GEE), we explored the temporal and spatial characteristics of permanent and seasonal water body occupied by global urban land expansion from 1986 to 2015 using the dataset of global annual urban dynamics (GAUD) and global surface water (GSW). Our objective can be characterized by: 1) Describing the spatial distribution pattern of water body occupied by urban land expansion on a global scale; 2) Analyzing the characteristics of changes in the water area occupied by urban land expansion over time on global, continental, and national scales; 3) Discussing the potential ecological effects of water body occupied by urban land expansion and the suggestions to solve this problem in China. We find that water areas occupied by global urban land expansion increase firstly but decrease then, representing 1033.2 km2 over 30 years, in which the seasonal water body is 711.7 km2 and the permanent water body is 321.5 km2. Asia is the most significant continent with urban land expansion among the six continents, followed by North America and Europe, which accounts for 799.4 km2, 122.5 km2 and 61.1 km2 respectively. Meanwhile, Europe is the only continent which mainly dominates by permanent water body while Russia and Algeria are the counties dominating by that. Especially, China, the United States and India are the countries with the most serious water body occupied by urban land expansion, amounting to 573.1 km2, 109.6 km2 and 24 km2 respectively. Many ecological and environmental issues can be attributed to the occupation of water body generated by urban land expansion, including: declining of wetland quality, increasing the risk of sandstorms, threatening the safety of drinking water and aggravating the urban heat island effect, etc. Although countries have made great efforts to protect water resources, the results of this study show that the problem of water bodies being occupied by urban expansion is still serious. Under the special national conditions and policy background, this problem appears to be particularly serious in China. To prevent more water bodies from being encroached by urban land expansion, feasible suggestions China could adopt are as follows: 1) Continuously paying attention to the expansion of urban land across the country; 2) Scientifically planning the layout of land use; and 3) Actively promoting wider international cooperation.

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