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    25 December 1994, Volume 9 Issue 4 Previous Issue    Next Issue
    Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS
    THE IMPACT OF GLOBAL CHANGE ON DESERTIFICATION IN CHINA
    Ci Longjun
    1994, 9 (4):  289-303.  doi: 10.11849/zrzyxb.1994.04.001
    Abstract ( )   PDF (915KB) ( )   Save
    The impact of global change on China's desertification discussed here is based on the following premises: ①According to general acknowledgoment of the most international researchers, if the current industral structure will remain unchanged, CO2 concentration will be doubled until 2030 and mean annual temperature will be increasing for 1. 5-4.5℃ then; ②"Desertification" caused by irrational human activities and climatic change is referred to the land degradation in arid, semi-arid and dry sub-humid areas. The analysis of China's desertification adopts UNEP's aridity index (ratio of annual precipitation to potential evapotranspiration) which ranges from 0. 05 to 0.65 excluding arctic and sub-arctic regions. The potential evapotranspiration is abtained from Thornthwaite's formula. 30 year's data of more than 700 climatological station in China have been used for calculation. The result of the analysis is as follows:(1)Under the impact of the global Change, China's arid zones will be expanded and land desertification will be developed. Currenty, China's arid, semi-arid and dry sub-humid areas cover 2.976 million square km plus extreme arid area 697 thousands square km. the total area of arid and extreme arid areas is 3.673 million square km of 38.3% of China's total area, including 2. 08 million square km of desertificated land area. After CO2 doubled and mean annual temperature increased to 4℃, China's arid area will be expanded to 4.63 million square km or 48.3% of China's total area, including 2. 67 million square km of desertification land area. The increasing rate of land desertification will be 6941 km2/year.(2) Under the impact of global change, China's arid zone, will become warmer and drier. According to the date of more than 160 climatological stations in China for 40 years. During the period of 1951-1991, the 10 years running mean temperature of arid (semi-arid and dry sub-humid) areas shows an increasing tendency since the 70ties. The 10 years running precipitation also increased since 70ties, but slowly. But, the annual mean temperature of China's arid area increased insignificantly, its winter temperature increased obviously, but the summer temperature decreased. The annual precipitation of arid area has a prominent increasing after the 70ties. The semi-arid area of China has showed a different pattern of climatic variation, its temperature increased significantly since 70ties, especially in the winter, but its precipitation reduced obviously than the 50 and 60ties.
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    THE INSPIRATIONS OF RESOURCE STRATEGY IMPLEMENTATION IN DIFFERENT KINDS OF COUNTRIES AND THE SELECTION OF RESOURCE STRATEGY IN CHINA
    Wang Limao; Lang Yihuan
    1994, 9 (4):  304-312.  doi: 10.11849/zrzyxb.1994.04.002
    Abstract ( )   PDF (674KB) ( )   Save
    Resource strategy is an important integral part of the economic development strategy. Different countries have different resource strategies, and of course, have different results. On the basis of the analysis of resource strategies of different countries, this paper obtains three useful inspirations: ① The mutual dependence in international economic development becomes more and more strong. ② The selection of resource strategy should suit the reality of the country concerned. ③ The economic structure should be diversified.This paper also analyses deeply the causes of the formation of the highconsumption and low-efficiency resource strategy of China and points out the four main aspects of selecting the resource strategy:①Diversity is the starting point of the resource strategy of China. ② Fully utilizing the domestic resources and actively utilizing the resources abroad are the core of resource strategy of China. ③Protecting the resources and environment is an important integral part of the resource strategy of China. ④Establishing a resources-thrift type of national economic system is the target of China's resource strategy.
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    A STUDY OF THE ALTERNANT-MODE MODEL OF THE WATER RESOURCES EXPLOITATION AND UTILIZATION AND THE COORDINATIVE MANAGEMENT OF REGIONAL ECONOMY
    Zhu Wenbin
    1994, 9 (4):  313-321.  doi: 10.11849/zrzyxb.1994.04.003
    Abstract ( )   PDF (498KB) ( )   Save
    The water resources system consists mainly of surface and ground water. In this paper, the water resources system is resolved into the surface water system and the ground water system, according to the theory of the multi-level optimal control of a large-scale system. A multiple-objective management model is given for the surface water system, and an economic management model is developed for the ground water system. Then a coordinative function is designed in order to coordinate the surface and ground water systems. So, the total water resources system is operated by the optimal strategy. Various agricultural, industrial and life demand departments are considered in the regional economy. A decomposition-coordination optimal management model is developed for the demand water system. Finally,the total coordinated function is designed in order to coordinate the supply water system and the demand water system. So, the optimal operational strategy is provided for the total water resources system and the regional economic system.
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    THE GUARANTEE DEGREE OF WATER RESOURCES AND WATER SUPPLY MEASURES OF THE ENERGY BASE CONSTRUCTION IN YULIN REGION
    Tang Qingwei; Su Renqiong
    1994, 9 (4):  322-332.  doi: 10.11849/zrzyxb.1994.04.004
    Abstract ( )   PDF (601KB) ( )   Save
    Yulin Region is an important energy base of China, but it is poor in water resources.This restricting factor has important impact on local industrial development. This article has made analyses on the water resources, the conditions for utilization and development and the supply-demand balance. The conclusions are that the water resources within the region can basically meet the water demand of economic development in the near future through construction of reservoirs, runoff regulation, enhancement of waste water treatment and enlargement of regional water supply capability.
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    EVALUATION OF THE WETLAND ECOSYSTEM OF THE POYANG LAKE NATIONAL NATURE RESERVE IN JIANGXI PROVINCE
    Wu Jiangtian
    1994, 9 (4):  333-340.  doi: 10.11849/zrzyxb.1994.04.005
    Abstract ( )   PDF (509KB) ( )   Save
    In this paper, the characteristics of the wetland ecosystem of the Poyang Lake national nature reserve are discussed through considerations of the hydrography, soil, biological composition and system function. On the basis of the discussion, the classification and evaluation of the wetland ecosystem are conducted. In the end, four suggestions are made for the future development of the reserve.
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    FERTILITY EVALUATION OF THE PADDY SOIL IN THE RED SOIL REGION OF SOUTH CHINA
    Zhai Yushun, Zhang Xigu
    1994, 9 (4):  341-349.  doi: 10.11849/zrzyxb.1994.04.006
    Abstract ( )   PDF (502KB) ( )   Save
    On the Basis of the systematic analysis of soil fertility structure, the integrated fertility index(IFI)that reflects the fertility of paddy soil is proposed by using the fuzzy subordinate function and the principal component analysis theories and methods in this paper. In accordance with the values of IFI, the fertility levels of 43 species (genus)of paddy soil in Linchuan County, Jiangxi Province, are analysed and evaluated, the fertility grades of paddy soil are determincd, and the fertility index of each paddy soil of different fertility grades is examined.
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    VERTICAL DISTRIBUTION OF AGRO-CLIMATIC RESOURCES AND THE RATIONAL ALLOCATION OF AGRICULTURE IN THE QINLING AND DABA MOUNTAINOUS REGION
    Zhu Lin
    1994, 9 (4):  350-358.  doi: 10.11849/zrzyxb.1994.04.007
    Abstract ( )   PDF (491KB) ( )   Save
    Based on the climatic observational data of three longitudinal sections in the Qinling and Daba Mountainous Region during 1988-1989, the author firstly established some vertical distribution climatic models, with which the values of each factor were calculated in different heights. Then, according to the above-mentioned calculated results, the agro-climatic belts were divided in each section. Finally, the author analysed the climatic adaptivity to cash crops and plants in each belt and put forward some strategies for the rational distribution of agriculture in this region.
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    A STUDY ON THE PHYSIOLOGICAL CHARACTERISTICS OF FOUR MAIN KINDS OF GRASS IN THE GRASSLAND OF INNER MONGOLIA
    Wang Shuqiang
    1994, 9 (4):  359-364.  doi: 10.11849/zrzyxb.1994.04.008
    Abstract ( )   PDF (342KB) ( )   Save
    The four kinds of grass, namely Bromus inermis, Agropyron cristatum, Elymus sibiricus and Elymus tangutotum,are most important in the grassland in Inner Mongolia. The transpiration intensity, the photosynthesis intensity and the chlorophyll content of these grasses are measured and analysed in this study. The results show that in a day the maximum transpiration intensity of the grasses appears between 12:00 and 14:30 p.m.and it rises a little again at 4:00 p. m. The photosynthesis intensity of the grasses reaches the top in the reproductive stage. There is a linear relationship between the relative humidity of the air and the water content of the grass leaves. The correlation coefficient is 0.993.
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    RESEARCH ON THE METHODS OF QUANTITATIVE ESTIMATE OF THE GRASS OUTPUT OF A VAST GRASSLAND BY USING THE REMOTE SENSING DATA OF NOAA/AVHRR
    Li Jing, Chen Jin, Yuan Qing
    1994, 9 (4):  365-368.  doi: 10.11849/zrzyxb.1994.04.009
    Abstract ( )   PDF (416KB) ( )   Save
    In this paper, the Advanced Very High Resolution Radiometer (AVHRR) data from the NOAA Meteorological Saterllite are used to estimate the grass output of a vast grassland. Xilingele League of Inner Mongolia is selected as a test area, which is a typical grassland in North China. From the aspects of estimate principles, vegetation index selection and landscape ecological regionalization, the feasibility and approaches of using the NOAA/ AVHRR data to estimate and monitor the grass output of a vast grassland are discussed. Some new methods, including atmospheric correction, geometric correction and so on, are tried in data preprocess. The GIS technology also is applied in the research. It can be concluded that suitable landscape ecological regionalization and essencial data preprocess are the basis of improving the accuracy of output estimate.
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    ^AN INVESTIGATION OF SOME PROBLEMS IN THE USE OF SALINE WATER
    Zhang Li
    1994, 9 (4):  375-378.  doi: 10.11849/zrzyxb.1994.04.010
    Abstract ( )   PDF (170KB) ( )   Save
    Fresh water resources are very deficient in the HeiLongGang region of east Hebei Province. But where there are large quantities of saline water and slightly salinized water, tests and practices show that the slightly salinized water of 2-3g/1 can be used; besides, under suitable conditions, the saline water of 4-6g/1 can be used as well. This opens a new road to solve the problems of inadequate water resources of the region.
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