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    1992年, 第2卷, 第1期 刊出日期:1992-03-20 上一期    下一期
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    论文
    CHANGE OF REGIONAL ECONOMIC DEVELOPMENT POLICY IN CHINA
    查彦玉
    1992 (1):  1-9. 
    摘要 ( 573 )   PDF(411KB) ( 862 )  

    After 40 years of painstaking work, much improvement has been made in regional difference. The road of that development, however, is by no means a smooth one, full of setbacks and failure. The past forty years may be roughly divided into four stages: 1.a stage of rehabilitation and large scale transition towards the interior(1949-1959),2. the dispersion stage with an emphasis on the construction of the interior (1960-1977),3. a stage of moving back to the coastland and relative concentration of constructions of large scale industries (1978-1980), and 4. a stage of taking the coastland as the focal point for regional development (since 1981). Since the late 1970s, China began to carry out what is known as the Open-door policy. Great changes have taken place in regional development policy.

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    LAND RESTORATION IN CHINA
    郭焕成, 吴登茹, 朱鸿兴
    1992 (1):  10-17. 
    摘要 ( 922 )   PDF(340KB) ( 744 )  

    China has a land area of 9.6 million km2, 65% of the total land area of the world. Only 14.2% is cultivated at present, 0.5% is under fruit trees, 34.8% is in grazing. 17.2% is under forests, 2.6% is used for industry, communication and urban purposes, and 3.5% is covered by water. Of the remaining 27.2%, much is high and barren desert, or under permanent snowfields, or not yet used, or unable to be used with available technologies. Land resources have not been properly developed in some parts of China, owing to the pressure from population growth and other socioeconomic problems. For China as a whole, land restoration has made great progress. One solution is to increase the crop land area through reclamation.

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    ALFISOLS AND CLOSELY RELATED SOILS IN CHINA
    肖笃宁
    1992 (1):  18-29. 
    摘要 ( 596 )   PDF(2594KB) ( 727 )  

    Alfisols are important soils in China. They occupy about 1.25 million km2, or about 13% of the land area. In the current Chinese system of soil classification, burozem, yellow-brown earths, Baijiang (Planosol) soils and parts of drab soils. They are mostly forested soils with an estimated 5-13 t/ha·yr of organic matter returned to the soils from temperate mixed conifer and broad-leaved forest. In terms of elemental bio-cycling, Ca is prominent.In a comparison of 30 profiles the average ratio of clay (B/A) was 1.47 for Cryoboralfs and Eutroboralfs; 1.88 for Hapludaifs and 2.53 for Paleudalfs. From Eutroboralfs to Paleudalfs the average gain (or loss) in clay during soil development is about a factor of seven.The moisture regimes vary considerably between Hapludaifs, Cryoboralfs, and associated Cryaquepts, but the amount of water is always enough to cause significant leaching. In the weathering, and pedogenesis processes TiO2, MgO and Fe2O3 are accumulated, respectively, in both AΔ and BΔ horizons;but SiO2 and Al2O3 tend to be leached from the solum.

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    IMPACTS OF FUTURE SEA LEVEL RISE ON SALT WATER INTRUSION IN THE CHANGJIANG RIVER ESTUARY
    杨桂山
    1992 (1):  30-41. 
    摘要 ( 857 )   PDF(516KB) ( 788 )  

    Sea level rise could increase the salinity of an estuary by altering the balance between fresh water and salt water. The implications of sea level rise for increasing salinity have been examined in the Changjiang (Yangtze) River estuary. By correlative analysis of chlorinity, discharge and tidal level and calculation of two-dimensional chlorinity, distribution of the Changjiang River estuary, the changes of the intensity and lasting hours of salt water intrusion at Wusong Station and the changes of chlorinity distribution in the South Branch of the Changjiang River estuary have been estimated when future sea level rises 50-100 cm. The intensity of salt water intrusion in the future will be far more serious than current trend.

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    THE RESEARCH ON THE DISTRIBUTION AND FORMS OF HEAVY METALS IN THE XIANGJIANG RIVER SEDIMENTS
    董文江, 张立成, 章申
    1992 (1):  42-55. 
    摘要 ( 666 )   PDF(2711KB) ( 791 )  

    In this paper, the contents and various forms of Cd, Cu, Zn and Pb in the sediments of the Xiangjiang River have been investigated. The presentation of this paper focuses on the various forms and characteristics of the heavy metals in the column sediments at Xiawan Port of Zhuzhou, which has been severely polluted by a metallurgical plant.The forms of the heavy metals discussed in this paper are: The concentration of the exchangeable forms of Cd, Cu, Zn and Pb, in the forms of carbonates and Fe/ Mn oxide in water, the combination of Cu with organic matter and form, and the proportion of the residue form at each section have been studied.

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    COMPREHENSIVE DEVELOPMENT OF AGRICULTURE IN THE LOESS PLATEAU AREA
    李柱臣
    1992 (1):  56-63. 
    摘要 ( 530 )   PDF(2386KB) ( 843 )  

    The Loess Plateau is one of China s developing areas where socio-econ-omy is backward, ecological environment deteriorated and people's life difficult.The purpose of carrying out comprehensive development of the area's agriculture is, in essence, to open up new fields of agro-production, to intensify the utilization of related resources, to raise productivity and to win bigger output. The decision is important, as by so doing, the physical landscape could be tranformed, the local economy could be flourished, and the people's standard of living could be improved, and moreover the national development strategy of "depending on the East and shifting to the West" and building Shanxi Province into an energy and chemical industrial base could be realized.Based on field investigations in recent years, the auther proposed the purpose, target, principles, steps, tactics and strategies for the comprehensive development of the are's agriculture.

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    THE TROPICAL RAINFOREST VEGETATION IN XISHUANGBANNA
    朱华
    1992 (1):  64-73. 
    摘要 ( 655 )   PDF(2547KB) ( 777 )  

    The tropical rainforest in Xishuangbanna, Yunnan Province of China, is introduced in detail in this paper. Situated at the northern margin of tropical mainland SE Asia and controlled by monsoon climate, the region has been climatically at the lower limits for tropical rainforests, however true tropical rainforests exist and develop luxuriantly in the region. The reasons for this are discussed. In general phytocoenological characteristics such as vertical stratification, life form spectrum, species riches etc. the tropical rainforest in Xishuangbanna is very similar to the typical tropical rainforest in equatorial region, but it is characterized by a clear change of physiognomy between different season. As occurred at the latitudinal and altitudinal limits of tropical rainforest, the flora of the rainforest is endowed with the nature of northern margin of tropical zone of SE Asia and is transitional toward the flora of subtropical forest of China. In recent years the region has been opened up to use in a large scale and primary forests, especially rainforests, have been severely destroyed. The conservation and research to the tropical rainforest are very urgent and have to be done at once.

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    THE PROTECTION OF THE ECOLOGIC ENVIRONMENT OF THE GREEN CORRIDOR IN THE LOWER REACHES OF THE TARIM RIVER
    程其畴
    1992 (1):  74-79. 
    摘要 ( 578 )   PDF(2364KB) ( 637 )  

    The Green Corridor in the lower reaches of the Tarim River is not only a unique natural landscape in desert but also an important passageway. Nowadays, the ecologic environment of the corridor is getting worse and worse due to man's economic activities and the lack of knowledge of the importance of the environment, which is one of is the three environment problems in Xinjiang. The corridor is in great need of planning and managing.

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    RESEARCH ON THE COASTAL DEVELOPMENT STRATEGY IN CHINA:TAKE SHANDONG PROVINCE AS AN EXAMPLE
    李兴弟
    1992 (1):  80-86. 
    摘要 ( 742 )   PDF(2427KB) ( 704 )  

    Nowadays in China, the coastal development strategy (CDS) aims to make the region (with population 160 million) ahead of developing export-oriented economy and to promote the inland economic prosperity at the same time.The paper analyzes the CDS based on the background of coastal area and the situation at home and abroad, and mainly discusses the relevant tactics in Shandong Province, China.

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    THE STUDIES ON WATERLOGGING DAMAGE IN JIANGHAN PLAIN USING DEM
    喻光明
    1992 (1):  87-93. 
    摘要 ( 765 )   PDF(2342KB) ( 825 )  

    The waterlogging damage is the pit to agriculture in plain and lake region. This damage is related to the groundwater, ancient lakes, soil, land use and negative landforms, the conventional technique is adopted to the study of this damage. In this paper, we suggest a new technical method, the technique is based on DEM, to study this problem. The DEM is developed on the ECLIPSE MV/ 10000 AOS/ VS system, and the estimation model of waterlogging loss is built on the historical data of the test region in Jianghan Plain. and then, the rice waterlogging loss of test region is estimated by them.

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