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  • 1989 Volume 9 Issue 3
    Published: 20 May 1989
      
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  • ON FEATURES OF TOWN DEVELOPMENT IN ZHUJIANG RIVER DELTA SINCE 1978
    Xu Xueqiang, Huang Danna
    1989, 9(3): 197-203,291. https://doi.org/10.13249/j.cnki.sgs.1989.03.197
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    Since 1978,rural urbanization has been accelerated owing to the rapid development of commodity agriculture,industrialization and tertiary industry in the Zhujiang River Delta.The population in towns increased naturally before now is mainly increasing mechanically.The towns have been turned from traditional central places into those with various functions,particularly industrial ones. In the Zhujiang River Delta,the density of population and the level of economic changes are high in the core regions,and low in the peripheries; and town population increases slowly in the core regions and fast in the peripheries.In the core regions more industrial towns emerge.The gap has been reduced greatly.The reform of the space construction of the region′s economy the improvement of transportation,the adjustment of the standard of town setting have promoted the space distribution of the towns in the Zhujiang River Delta from being centralized to balanced.
  • A STUDY ON DEPENDENCE PROPERTY IN TIME FOR ANNUAL FLOW SERIES IN THE UPSTREAM OF THE CHANGJIANG RIVER
    Deng Yuren, Ding Jing
    1989, 9(3): 204-212,291. https://doi.org/10.13249/j.cnki.sgs.1989.03.204
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    The study on dependence properties in time for annual flow series is greatly important in both theory and practice.The paper deals with the regional properties of annual flow dependence in time for main rivers in the upstream of the Changjiang River.Some stochastic models used to describe the sequential variation of annual flow on different conditions are also indicated.
  • COMPARATIVE ANALYSIS OF STRONG AND WEAK SUMMER MONSOON YEARS IN MIDSUMMER IN NORTH CHINA
    Wu Yonglian, Tu Meizhen, Wu Baojun
    1989, 9(3): 213-220,291. https://doi.org/10.13249/j.cnki.sgs.1989.03.213
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    This paper,using the high altitude data from 45 stations and the surface data from 100 stations,makes a comparison between strong monsoon year(1973)and weak monsoon year(1972)in North China,and calculates wet static energy,vertical structure of wind of high-and low-level flow fields,the contents and transport of water vapour,the income and export of water an vapour,and water cycle,etc.in strong and weak monsoon years respectively. The following conclusions have been drawn: 1.There was a distinct occluded high energy tongue in the strong monsoon year and a low energy tongue in the weak monsoon year. 2.In the strong monsoon year,western Pacific subtropical high was strong, a wet and warm south air-flow from it met with the drier westerlies nearby 41°N and there were two water vapour transport air-flows.In the weak monsoon year,subtropical high was weak,a wet and warm south air-flow met with westerlies nearby 35°N and there was only one water vapour transport air-flow. 3.The water vapour content of the whole layer in North China in midsummer was 20—40mm and water vapour content was distributed along northeastsouthwest in the strong monsoon year and along latitude in the weak monsoon year. 4.There was a net income of about 95×108m3/month in the strong monsoon year and a deficiency of about 345×108m3/month in the weak monsoon year. 5.Rainfall in North China in midsummer relies mainly on external water vapour supply in both strong and weak monsoon years.
  • ENVIRONMENTAL GEOMORPHOLOGY AND URBAN CONSTRUCTION OF CHANGCHUN CITY
    Xiao Ronghuan, Li Tiecheng, Qiao Na
    1989, 9(3): 221-231,291. https://doi.org/10.13249/j.cnki.sgs.1989.03.221
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    Taking Changchun City as an example,this paper approaches some aspects of urban environmental geomorphology researches in the plain region of the semi-humid temperate zone.The features of the landforms and the regional textures are analysed with the terrain slope map,the topographic complex degree map and the urban geomorphic regional map.Meanwhile,the urban surface materials and their properties on engineering are studied.It′s concluded that disastrous geomorphological processes are seldom found except tne overflow of the Yitong River.After discussing the relations of geomorphy of Changchun City and the urban historical development,the layout of building areas,road construction,water supply and sewerage network and afforestation,the paper poins out that developing afforestation is the important measure to improve the environment in the city propers,suburbs and their contiguous areas.
  • THE STUDY ON TRANSFORMATION PRINCIPLE OF NITROGEN AND THE CAPACITY OF NITROGEN POLLUTION IN THE SONGHUA RIVER
    Yang Ji, Jiang Shuchun
    1989, 9(3): 232-241,291. https://doi.org/10.13249/j.cnki.sgs.1989.03.232
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    On the basis of studying the transformation principle of nitrogen in the middle-stream of the Songhua River the authors found that the change of real measured concentration of ammonianitrogen did not conform to the graded dynamic model adopted extensively under low water temperature(especially in freezing phase).The real concentration of ammonianitrogen is mainly affected by the speed of transforming organonitrogen into ammonianitrogen and the speed attenuation of ammonianitrogen.And the authors advance that the water quality of model of the Songhua River should be set up with the theory of chemical dynamic successive reaction and estimate the environmental capacity of ammonianitrogen pollution in the Songhua River.
  • RESEARCH ON ION FLOW AND CHEMICAL DENUDATION IN RIVER SYSTEM OF DONGTING LAKE
    Li Jingbao
    1989, 9(3): 242-251,291. https://doi.org/10.13249/j.cnki.sgs.1989.03.242
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    The average value of mineralization degree of water in river system of Dongting Lake is 160 mg/L(the highest is 260mg/L,the lowest is less than 50mg/L).The mineralization degree in rivers of this system presents a decreasing trend from the northwest and southwest of the system and hills north to the Nanling Mountain,to the northeast outlet of Dongting Lake,due to the differences in climate and hydrology,as well as the differences in association of geology,geomorphology and soil.The ion flow in rivers and lakes of this system has an obvious seasonal change. The river system is a strong chemical denudation region.The main factors to influence chemical denudation are precipitation,runoff and soluble and non-soluble substances,and geomorphology and vegetation as well.
  • THE INFLUENCE OF SLOPE DIRECTIONS ON PRECIPITATION DISTRIBUTION IN THE CHANGBAI MOUNTAIN AREA
    Ma Shuqing
    1989, 9(3): 252-258,292. https://doi.org/10.13249/j.cnki.sgs.1989.03.252
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    According to the topographic and climatic characteristics and long-sequence precipitation data of the Changbai Mountain,the distributive charcteristics of coefficients of relative precipitationin in different slope directions of the main ridges in a year and from May to September are analyzed,and the relation functions between relative precipitation and slope direction angles are established.The order of precipitation in different slope directionsins on various ridges is SW & gt;S & gt;W & gt;N & gt;E & gt;NE,their corresponding relative Precipitation coefficients are 1.083,1.071,1.060,0.917,0.913,0.912 in a year,and 1.071, 1.059,1.050,0.933,0.933,0.922 from May to September.The precipitation is highest in windward slopes and lowest in leeward slopes,and the former is 20.5%more than the latter.The effect of slope is great in the Panling, Weihuling Yingerling ridges and Dunhua basin.The effect of slope on precipitation depends on the interception of slope to air current.
  • OPTIMUM PRODUCTION QUOTA OF MA’ANSHAN IRON AND STEEL COMPANY AND ADJUSTMENT OF REGIONAL ECONOMIC STRUCTURE
    Fang Jueshu, Ge Benzhong, Wu Peilin, Su Qin
    1989, 9(3): 259-266,292. https://doi.org/10.13249/j.cnki.sgs.1989.03.259
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    The article deals with the history,distribution characteristics and optimum production quota of Ma′anshan Iron and Steel Company,as well as the consequent adjustment of regional economic structure,based on the tendency of increasing demand for steel and iron in our country.
  • THE PROSPECT FOR SUPPLY AND DEMAND OF WATER IN BEIJING-TIANJIN-TANGSHAN AREA AND THE PRELIMINARY STUDY ON THE WAY OF WATER SUPPLY OF JIDONG STEEL PLANT
    Gao Guangsheng
    1989, 9(3): 267-273,292. https://doi.org/10.13249/j.cnki.sgs.1989.03.267
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    The paper deals with the way and condition of water supply at different sites of Jidong Steel Plant on the basis of prospect for supply and demand of water in Beijing-Tianjin-Tangshan area.The conclusions are as follows: 1.Jidong Steel Plant should be built in Jidong district because the district is the only are a which can supply water in Beijing-Tianjin-Tang-shan area. 2.Water supply is convenient and assured if the plant built on the lower reaches of the Luanhe River. 3.The plant can be built in Wangtan,Xuzhuang or Niezhuang because there is a favourable condition of using seawater and saving fresh water.
  • CHANGES OF VEGETATION AND CLIMATE IN QIAN’ AN COUNTY,JILIN PROVINCE SINCE LATE TERTIARY
    Jia Cuihua, Yu Li, Du Naiqiu, Kong Zhaochen
    1989, 9(3): 274-282,292. https://doi.org/10.13249/j.cnki.sgs.1989.03.274
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    Based on the information of the sporo-pollen assemblages of 117 samples obtained from the Zk-16 core near Xuezijing,Qian’an County,seven pollen zones are divided in ascending order.Pollen zones 1--3 belong to the Late Tertiary,dominated by arboreal pollen,mainly consisting of Pinus,Tsuga, Jutlans,Ulmus,Quercus,Castanea,Carya,Liquidamer,Symplocos and little Abies and Picea,indicating that the area was covered by mixed conifer and broadleaf deciduous forest,climate was humid and warm.Pollen zone 4 is represented by herbaceous and semi-shrub plants,such as Graminene, Chenopodiaceae,Artemisia and Humulus,indicating it was covered by cool-temperate grassland or desert,with cold-temperate climate.According to the temperature decreasing at this zone,the Late Tertiary-Early Pleistocene boundary shound be about 2.4 million years ago.In the Zk-16 core lower boundary of the Pleistocene is in the depth of about 113 meters.
  • AN APPROACH TO PLANT RESIDUES OF PEAT IN THE SANJIANG PLAIN REGION
    Zheng Xuanfeng
    1989, 9(3): 283-288,292. https://doi.org/10.13249/j.cnki.sgs.1989.03.283
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    The Sanjiang Plain region situated Jn the northeastern end of China is one of the concentrated distribution areas of mire in the country.This region has 11192 km of marsh,of which peat moor is 242km2.Peat is a special product of mire.Plant residues are important components in peat.Plant residues provide the scientific basis for peat classification and utilization.Therefore, the study on plant residues has both production practice value and theoretical significane. The paper discusses peat distribution and emphasizes the main types and characteristics of plant residuesas,as well as the relationship between plant residues and peat.The plant composition and vegetation types of mires are closely related to plant residues.