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    Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    AN APPROACH TO SOME PROBLEMS OF THE TERRITORIAL MANAGEMENT IN THE LOESS PLATEAU
    Chen Yongzong
    1988, 3(1): 1-8. https://doi.org/10.11849/zrzyxb.1988.01.001
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    Four problems are discussed in this paper.(1) The area of the Loess Plateau is 39.1×104 km2 instead of 56×104km2 or 43×106 km2, in which the area of the loess plateau in the middle reaches of the Huanghe River is 31.9×104 km2.(2) The control and exploitation of the Loess Plateau should be combined closely together. The exploitation should be carried out in the course of the control, and the former pormotes the latter. It is incorrect to put undue emphasis on one of them.(3) In the first place, water loss should be avoided, so as to reduce the soil loss. The measure for water conservation is to ameliorate the soil in order to enhance the ability of water storage of soil.(4) Since 1971 the sediment load of the Huanghe River has reduced 36% in which the sedement yield reduction by water-soil conservation occupies 48%. It is thus proved that the idea of the "water-soli conservation is the basis of harnessing the Huanghe River" is correct.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    ON THE BOUNDARY OF THE LOESS PLATEAU
    Yang Qinye, Zhang Baiping, Zheng Du
    1988, 3(1): 9-15. https://doi.org/10.11849/zrzyxb.1988.01.002
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    The Loess Plateau is a unique physico-geographic unit in China. There are some divergence of concept about it's boundary. This paper points out, that such divergence is due to different understanding of natural characteristics of the regions which are the transition from the Loess Plateau to surrounding natural regions.In the paper, several different concepts are reviewed, such as the Loess, the distributional region of the Loess, the Loess Plateau and the neighbouring distributional region of the Loess, the Loess Plateau, and the typical loess geomorphological region; all these concepts should not be confused. Finally, criteria and index for dividing the boundary of the Loess Plateau are discussed. Based on field investigation and landsat image interpretation, the boundary of the Loess Plateau is delimited.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    ALKALINE METAL ELEMENTS OF THE REHAI GEOTHERMAL FIELD IN YUNNAN PROVINCE
    Zheng Yaxin, Zhang Mingtao, Zhu Bingqiu, Zhu Lixin
    1988, 3(1): 16-27. https://doi.org/10.11849/zrzyxb.1988.01.003
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    Li and Rb values in 131 soil samples collected from 1982 to 1983 within an area of 60 km2 in the known hydrothermal active areas and their vicinity in Tengchong, Yunnan Province have been determined. The Li and Rb anomali es delineate two known hydrothermal active areas, rather consistent with the anomalies of the known geochemical indicator elements, including Hg As Sb Bi and B, and further confirm their prospects. At the same time Na and K values in hot waters of this field have also been determined and interpreted.Correlation analyses of Li, Rb and the known geochemical indicators are made. There exists a certain linkage between fossil geothermal systems and salt lakes. It is concluded that the presence of Li and Rb in soil could well be used to delineate geothermal fields, and geothermal systems could be exploited not only as energy resources, but also as mineral resources.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    ECOLOGICAL AND ECONOMIC COST-BENEFIT ANALYSES OF THE LAND RECLAIMED FROM LAKE
    Zhang Jiayu
    1988, 3(1): 28-36. https://doi.org/10.11849/zrzyxb.1988.01.004
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    In the early 1970's guided by the policy of "Grain must be taken as the key link in agriculture", people in Hubei and some other provinces in China started a "land reclaimed from lake" upsurge, which however incurred some knotty problems in the reclaimed areas. Ecological and economic cost-benefit analyses are made in this paper based on the data obtained from the reclaimed lake regions. It is concluded that land-reclamation should be regarded as a kind of disadvantageous action because of its adverse impacts on agricultural ecology, fishery, navigation and the climate in the reclaimed areas, which has been shown in recent years despite its limited benefits in grain production and in the elimination of oncomelania, the host of blood fluke.This paper points out that only by exploiting and utilizing lake resources properly can lakes be well manayed and protected, and can those renewable and valuable resources be constantly available for human beings.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    THE RESOURCES OF TIDAL FLAT SOILS OF LINGDING BAY IN THE ZHUJIANG RIVER MOUTH
    Zhang Xiran
    1988, 3(1): 37-46. https://doi.org/10.11849/zrzyxb.1988.01.005
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    The Lingding Bay, 2110km2 in erea, is situated in the northestern part of the zhujiang River mouth in Guangdong Province. The area abounds in resources of tidal flat soils. Through centuries the inhabitants of the area have built dikes around it and brought it under cultivation. The main crops are rice and sugar cane.The present paper discusses the physico-chemical properties of the soils. Its texture is medium clay. The salt and organic matter contents are generally 0.2-1.5% and 1.5-2.2%, respectively. They are mostly neutral-alkaline in reaction with pH value (between, 6.5-8.0). The natural fertility of the soils is high. The soil data are very useful for the area development, especially for the rational production system of agriculture and fishery. The development prospect of this area is very promising.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    WIND-ERODED AND SANDIFIED LAND AND ITS CONTROL IN STEPPE REGION OF ORDOS
    Chen Longhen
    1988, 3(1): 47-58. https://doi.org/10.11849/zrzyxb.1988.01.006
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    Steppe region of Ordos in China is the most serious area suffered from wind erosion and sandification. The processes of wind-erosion and sandification of land and its recovery is in progress alternately.The processes in occurrence and development of wind-erosion and sandification of land may be divided into four historical periods: (1) ecological balance was destroied and land came to be wind-eroded and sandified in the late Surpleistocene Epoch of Quaternary Period; (2) ecosystem balanced, wind erosion reduced and shifting dunes fixed naturally in Holocene Epoch of Quaternary Period; (3) ecological balance was destroyed again, wind erosion developed and shifting dunes recovred after 500 A. D.; (4) ecological balance has been destroyed seriously and the area of wind erosion and sandification have expanded rapidly since 19th century A. D.Modern processes of wind erosion and sandification can be divided into three main types in the light of main land differentiation, that is, ridgeland, fixed sandyland and hollowland. Each type can be divided into four stages according to the degree of wind erosion and sand cover, i.e. slight, moderate, severe and ultra-severe.To adopt measures of artificial sand-fixation and growing grass by closing sands can rapidly make the recovery of vegetation and soil on the wind-eroded and sandified land in the Ordos steppe region, and the shifting dunes could be fixed and semifixed in about ten years.Rational use of land is the effective measure to control wind erosion and sandification and to mantain ecological balance beneficial for mankind.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    DYNAMIC CLUSTER ANALYSIS OF FOREST CLIMATE IN WESTERN PART OF THE LOESS PLATEAU
    Yuan Jiazu, Chen Jiwei
    1988, 3(1): 59-68. https://doi.org/10.11849/zrzyxb.1988.01.007
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    Poplar is one of the major tree species in the Loess Plateau. According to the analysis of degree of correlation between increment data of analytic Poplar stem measured under different site conditions and the climatic data in the same period, 8 climatic factors whose degrees of correlation are higher were selected as the cluster factors, and then the weight of each factor was obtained based on the value of degree of correlation. The climatic data were collected from 68 meteorological stations in the western part of the Loess Plateau (1951-1980). After these data were standardised and by using dynamic cluster analysis, western Loess Plateau were divided into different forest climate zones.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    USE ARC/INFO FOR EVALUATION OF LAND RESOURCES FOR CULTIVATION
    Dai Xu
    1988, 3(1): 69-77. https://doi.org/10.11849/zrzyxb.1988.01.008
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    Integrated Terrain Unit Map (ITUM) with several overlays of land elements is being developed in the world. The ITUM is a new computer mapping system. The project of Tengchong, land resource evaluation, was supported by software-ARC/INFO. After ITUM was digitized, it was used as base for land resource evaluation in Tengchong.Two models for evaluation, TT = VI* (V2 + V3 + V4)/3* 0.01 and TT2 = V1*V2*V3*V4* 0.000001, were designed. It was borne out that the first model was better than the second one by comparing output maps of evaluation with land-use map of Tengchong.By use of statistic analysis for data, four classes of land were divided:Class 1, Lands in class 1 have few limitations that restrict their use.Class 2, Lands in class 2 have some limitations that reduce the choice of plants or requiremoderate conservation practices.Class 3, Lands in class 3 have severe limitations that reduce the choice of plants or require special conservation practices.Class 4, Lands in class 4 have severe limitations that make them generally unsuited to cultivate.Area of 541.91 sq. km is suitable to farm in Tengchong. It is onely 29.52 per cent of whole area. But now, area of 534.94 sq. km has been cultivated and a few arable virgin in Tengchong can be cultivated.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    CONDITIONS ANALYSIS OF RURAL NATURAL RESOURCES OF SHANDONG PROVINCE AND THE STUDY OF ITS RATIONAL EXPLOITATION AND UTILIZATION
    Ji Mingchuan
    1988, 3(1): 78-85. https://doi.org/10.11849/zrzyxb.1988.01.009
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    Based upon the conalyses of favourable conditions, unfavourable factors and the existing problems of the rural natural resources of Shandong Province, the anthor, from macroscopic angle, determines the basic leading thinking and steps for the rural development of Shandong Province, and puts forward the magor strategic measures for the rational exploitation and utilization of rural natural resources.
  • Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    SEVERAL PROBLEMS TO STUDY THE POPULATION SUPPORTING CAPACITY OF LAND
    Mei Chengrui
    1988, 3(1): 86-94. https://doi.org/10.11849/zrzyxb.1988.01.010
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    <> has been an important strategic study on harmonious development in China.This paper discussed the population supporting capacity of land in relation to the quantity and quality of land resources, ecosystem and technological economics. Undoubted, It is the nucleus in the study.1. The quantity and quality of land resources is the foundation and essential reliance to study the population supporting capacity of land. But should also pay special attent to the capacity and exploitable condition of preparing arable land resources.2. The land ecosytem is the basic arena of human activity. Its balance should be regulated and controled with artificial method to maintain continuous increase in productive forces. The regulation of ecosytem includes mainly the macrostructure effect on rational exploitation and utilization of land; the balance of input and output in land ecosystem; and the relationship between ecologic and economics efficiency.3. The development of agro-technical economics inevitably has an effect on the quality and range of land utilization and also the population supporting capacity. It must be fully consider the economic efficiency of different use way of land and the technical systems of regional agro-modernization effect on raising productive forces of land.In view of the balance among the population increase, resources capacity and productive development, it is suggested that the population supporting capacity must rationly coordinate with the speed of social development in a certain period.