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  • 1989 Volume 9 Issue 4
    Published: 20 July 1989
      
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  • INTEGRATED EVALUATION AND REGIONALIZATION OF AGRICULTURAL NATURAL RESOURCES IN HAINAN ISLAND
    Deng Honghai
    1989, 9(4): 293-305,387. https://doi.org/10.13249/j.cnki.sgs.1989.04.293
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    Taking Hainan Island as an example, using the software package including principal components analysis, factor analysis and cluster analysis, and a M-350 S computer, the data about agricutural natural resources 93 of geographical units of the island over the past 30 years are processed. The integrated evaluation and regionalization of agricultural natural resources of the island was carried on in three steps: 1) the integrated evaluation and regionalization of climate esources; 2) the integrated evaluation and regionalization of climate, water and soil resources; 3) the integrated evaluation and regionalizafion of climate, water, soil and crops resources. Three Characteristics of applying this approach are: 1) the qualitative and quantitative analysis and systematic synthesis are combined, the overlapping method is replaced by the systematic synthesis; 2) the monomial and integrated regionalization are combined; and 3) the manual operation is replaced by the computer operation,
  • ON THE ENVIRONMENT AND THE "COLD TROUGH" DURING THE QUATERNARY ICE AGE IN EAST CHINA
    Yang Dayuan
    1989, 9(4): 306-310,387. https://doi.org/10.13249/j.cnki.sgs.1989.04.306
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    A cold trough existed in east China during the Pleistocene ice age, which is a new theory advanced by Prof.Yang Huairen (1980). The theory explains successifully the greatest horizontal and vertical displacement of the climatic belts in east China during the Quaternary ice age and the particularity of paleo-environmental pattern, The causal mechanism of the "cold trough" is the rising of high mountains and high plateaus in west China since the Pliocene epoch and the weakening of the summer monsoon in east China during the Quaternary ice age. The author considers that the new theory greatly contributes the international academic circles.
  • DIVISION AND COMPREHENSIVE UTILIZATION OF BUSH GRASS-SLOPES IN SOUTH CHINA
    Li Wan, Zhang Zhonglan, Miao Junming
    1989, 9(4): 311-316,387. https://doi.org/10.13249/j.cnki.sgs.1989.04.311
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    Bush grass-slopes are basically the product of counter succession of forests, which are secondary and unstable. Only grasslands improved,can most of them have economic efficiency. The direction of exploitation and utilization should take the way to combine grass, bush and trees, in order to obtain good results in economy and ecology. Bush grass-slopes in south China can be divided into 7 areas: Siehuan basin Wuling karst bald-mountain, hills and mountains in south of the Changjiang River, hills along coasts, the Yunnan Plateau, the Hengduan Mountain,and vallys in south Yunnan. The geographical conditions, grass-slope characteristics and utilization of each area are expounded.
  • STUDY ON THE FORMATION AND EVOLUTION OF HORQIN SANDY LAND
    Qiu Shanwen
    1989, 9(4): 317-328,387. https://doi.org/10.13249/j.cnki.sgs.1989.04.317
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    The basic characteristics of Horqin sandy land are that sand dunes cover on alluvial plains,fixed and semi-fixed sand dunes are dominant, with few moving ones. Horqin sandy land was formed in the Middle Pleistocene. Thicker loess was deposited in the southern and eastern parts of the sandy land. By the Late Pleistocene, the Horqin sandy land had been experiencing some positive and negative desert processes. Influenced by human activities, Horqin sandy land is going worse. Accordingly, the sandy land should be improved and managed.
  • A PRIMARY STUDY ON THE INFLUENCE OF NORTH ATLANTIC OCEAN SURFACE TEMPERATURE ON THE PLENTY OR DEFICIENCY OF DISCHARGE IN SPRING IN NORTH XINJIANG REGION
    Zhang Xinping
    1989, 9(4): 329-335,387. https://doi.org/10.13249/j.cnki.sgs.1989.04.329
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    The paper reveals the effect of anomalous sea surface temperature (SST) districution over the North Atlantic Ocean on the trough and ridge in westerlies, as well as the connection between anomalous SST distribution and plenty or deficiency of discharge in spring in north Xinjiang region, At last, the paper puts forward a possible mechanism through which the SST of the North AtlanticOcean affects the discharge in spring in north Xinjiang, and provides a possible physical basis for long-range hydrologic forecast of the region,
  • MATHEMATICAL APPROACH TO THE EFFECT OF CHANGE OF RIVER CAUSED BY THE LONGITUDINAL AND UPSTREAM DEPOSITION IN THE LOWER REACHES OF THE HUANGHE RIVER
    Li Qiang, Lu Zhongchen
    1989, 9(4): 336-345,387. https://doi.org/10.13249/j.cnki.sgs.1989.04.336
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    The effect of longitudinal deposition together with the upstream deposition causes the adjustment of longitudinal profile in the lower reaches of the Huanghe River. Upstream deposition depends on the change of base level. From mathematical model, the effect and scope of upstream deposition are dealt with,and longitudinal and upstream deposition exist conjugate relalion. Generally, percentage of depth of upstream deposition in total deposition depth is 48% in Yuwa, 33% in Lijin, 5% in Luokou, and 0% in Aishan in the lower reaches of the Huanghe River. The end point of upstream deposition does not exceed the Aishan at most. Besides,the authors make use of the concept of longitudinal wave and upstream wave to analyze the numerical results and receive the satisfactory conclusions.
  • VERTICAL ZONES OF VEGETATION IN LUYA MOUNTAIN IN SHANXI PROVINCE
    Zhang Jintun
    1989, 9(4): 346-353,388. https://doi.org/10.13249/j.cnki.sgs.1989.04.346
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    The Luya Mountain (38°36’-39°02N, 111°46’-112°54’E) is located on the Shanxi Plateau (a part of the Loess Plateau). The highest peak goes up to 2772 m and the natural conditions vary greatly with elevation. There are 72 families, 201 genera and 309 species of seed plants in the Luya Mountain area. Temperate plants are absolutely dominant in this area. The vertical zones of vegetation in the Luya Mountain are divided as follows: forest-steppe zone (1300-1500m); deciduous broadleaf forest zone Platycladus orientalis forest subzone (1350-1550m), Pinus-Quercus forest subzone (1550-1700m); coniferous and braodlcaf mixed forest zone (1700-1850m); cold-temperate coniferous forest zone(1750-2600m); subalpine scrub and grassland zone (2450-2772m), The characteristics of each zone are expounded.
  • THE STUDY ON VEGETATION COVERING OF THE CHANGBAI MOUNTAIN BY REMOTE SENSING INFORMATION
    Wan Enpu, Lu Xianguo, Wang Yeqiao, Bo Liqun
    1989, 9(4): 354-361,388. https://doi.org/10.13249/j.cnki.sgs.1989.04.354
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    The Changbai Mountain is rich in natural resources and complicated in ecological structure.With the Changbai Mountain Natural Conservation of the MAB Program of UNESCO, the region becomes a very important scientific research base. It is the first time to do the dynamic analysis of vegetation covering in the region by means of remote sensing. The classification of LANDSAT TM images of the Changbai Mountain was digitally processed. Combined with multitemporal LANDSAT images, DTM information and field investigation, the dynamic change and current situation of vegetation covering of the mountain are analyzed. The vegetation distribution feature of the Changbai Mountain is: taking the highest peak in the mountain range as the axis, presenting a ring-like belt distribution. Up 700 meters above sea level is primeval forest. From top to bottom, it is divided into four zones:alpine tundra zone, erman birch forest zone; coniferous forest zone and broadleaf-Korean pine forest zone. Below 700 meters is overcutting area. The forest covering appeared an obviously decreasing trend. In the past 30 years, it decreased by almost 20%. On the other hand, the quality of the forest is also decreased. The proportion of secondarly forest is increasing. It causes the ecological environment worse, and the forest ecological system function decreasing. The strategic decision for reasonable utilization and management of natural resources of the Changbai Mountain is also forwarded.
  • A STUDY ON THE METHOD FOR ECOLOGICAL DIVISION OF CITRUS IN A COUNTY: TAKING JIANGSHAN COUNTY AS AN EXAMPLE
    Huang Shoubo
    1989, 9(4): 362-368,388. https://doi.org/10.13249/j.cnki.sgs.1989.04.362
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    Citrus trees (Citrus Linn) are important economic craps for south China. They must grow in warm and humid cimate. Freeze injury in winter is the main weather calamity of the northern fringe of citrus trees growing region of China. It affects the normal growth, development, output and quality of citrus.The method for ecological division of citrus trees in a county is discussed. Citrus trees are one of the typical frost tender plants in subtropical zone. Jiangshan County is a new citrus growing area of Zhejiang Province. It is situated at the northern fringe of citrus growing region. This county can be divided into four ecological areas of cultivating mandarin (Citurus reticulata) according to the major ecological factors (topography, climate, and soil), namely: near suitabe (Ⅰ), poor suitable (Ⅱ), possible growing (Ⅲ), and non-growing (Ⅳ), and nine sub-areas according to the condition of citrus freeze injury in winter and citrus dry damage in summer. Ecological conditions of area Ⅰ are basically suitable for mandarin growing.
  • FORMATION AND EVOLUTION OF TAIHU LAKE
    Jing Cunyi
    1989, 9(4): 378-385,388. https://doi.org/10.13249/j.cnki.sgs.1989.04.378
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    Taihu Lake is situated in the Taihu Plain, south of the Changjiang River. It covers an area of 2338.1 square kilometres,and is one of the five large freshwater lakes in China. It is proved that the Taihu Plain was not transgressed extensively when there appeared a high sea level in the Middle Holocenc by the continental deposit on the Taihu Plain, many remains of ancient culture of the early and middle Neolithic period and the peat-buried sites 5000-6500 years ago. Taihu Lake was formed by river silting up and water confluence. Taihu Lake has a large area and shallow water. Disturbed by storm, the deposit at the bottom of the lake was very thin. Wave and lake current made the west and south banks on the lake in the shape of are. The area of the lake has been expanding since its formation. The peak period of expansion appeared in the warm time of the Sui and Tang dynasties.