Please wait a minute...

当期目录

    1993年, 第3卷, 第3期 刊出日期:1993-09-20 上一期    下一期
    全选选: 隐藏/显示图片
    论文
    THE SPREAD OF AGRICULTURE IN CHINA
    赵松乔
    1993 (3):  194-202. 
    摘要 ( 685 )   PDF(2611KB) ( 766 )  

    At pressent, China has about 100 million ha of farmland and 1.1 billion inhabitants, of which, about 80% are still engaged in agriculture. In geographical distribution, primitive shifting cultivation was at first mainly scattered in small patches in Eastern Monsoon China, especially concentrated in the middle and lower reaches of the Huanghe (Yellow) River and the Changjiang (Yangtze) River. The ratio of agriculture to industry in production value changed from 7:3 in the early 1950s to 3:7 in the middle 1980s. Agricultural Regionalization is based upon agricultural development as well as physical regionalization in China. Seven first-level agricultural regions might be identified.

    相关文章 | 计量指标
    POPULATION EXPANSION IN CHINA'S METROPOLISES AND ITS SCALE-CONTROL
    何兴刚
    1993 (3):  203-213. 
    摘要 ( 670 )   PDF(2714KB) ( 873 )  

    Metropolises are centers of politics, economy, culture and information, and also economic growth poles in comparatively large areas. After 1949, China's urban structure have changed greatly, from original "pyramid" shape into "upside -down pyramid" shape, that is, more megalopolises and metropolises, fewer medium-sized and small cities. The most distinguishing feature of urban population growth was the remarkable increase of population in megalopolises and metropolises. The key reason for urban population expansion is to want to obtain the benefits of scale -agglomeration economy of metropolises. The number of urban functions directly determines the quality and quantity of urban population. Metropolises appeal not only agricultural population but also the population of medium-sized and small cities, which put much more population pressure on metropolises. The ideal goals of scale-control of metropolitan population are discussed in terms of economy, society and ecollogy. In order to control the metropolitan population expansion, the following measures should be taken: developing medium-sized and small cities, and satillite cities establishing rationally regional urban system, reasonably distributing industrial enterprises, and greatly developing township enterprises.

    相关文章 | 计量指标
    NEW DEVELOPMENT PATTERN AND COORDINATION WITH ENVIRONMENT FOR GREAT SHANGHAI
    姚士谋, 帅江平, 侯晓虹
    1993 (3):  214-225. 
    摘要 ( 726 )   PDF(2729KB) ( 679 )  

    The urban construction of Shanghai will come into a new area since China has deciared to exploit and open Pudong. Based on the analysis on economic development of China and the world, the developmental strategy for Shanghai should take the following contents into consideration: 1) Shanghai should be built into one of the most important intemational and modern supercity in Asian-Pacifie Region. 2) Shanghai should keep the position of the largest economic center of China and important port city for international trade. 3) Shanghai should be taken as growth pole of the Changjiang River Delta. According to the considderations mentioned above, the spatial distribution patten and the management of environment are discassed.

    相关文章 | 计量指标
    PRIMARY ANALYSIS OF DROUGHT AND WATERLOGGING LAW IN NORTH CHINA
    阐贵生, 孙荣强, 耿雷华
    1993 (3):  226-237. 
    摘要 ( 548 )   PDF(2711KB) ( 768 )  

    According to the drought and waterlogging disaster statistics over the last 30 years (1950-1979), the annual average area suffering from drought was about 300 million mu (1 mu= 1/ 15 ha) in the whole country, among which about 100 million mu were disastrous areas where the output reduced more than 30%. and the annual lost grains totalled about 5 billion kg. The waterlogging disaster was less than drought disaster. The area suffering from waterlogging was about 100 million mu, among which 60 million mu were disastrous. Drought and waterlogging disasters affect directly the development of the national economy. So it is important to study drought and waterlogging variations, especially the drought and waterlogging variation laws of the areas where the disasters frequently occur.The historical literatures and recent observation data reveal the fact that there existed drought and waterlogging variations. For example, the occurrence frequency of the outstanding and severe drought years in north China is higher than that of the Loess Plateau. The analysis of the annual rainfall variations of Beijing Station shows that the period of 1914-1948 was low-water in this region, the frequency and length of the negative-run were more than those of the period of 1949-1986, the most negative-run length was 6 years, and the frequency of positive-run was only 1 (2 years). The period of 1949-1986 was plentiful water period in ths region. The frequency of positive-run was 3 times, lasting 3 years for the longest. The variatons of annual runoff are similar to the variations of annual rainfall on the whole. In addition, the climatic factors affecting the drought and waterlogging variations are analyzed. The long -term obsreved data of rainfall and runoff in North China are fully collected, and the temporal and spatial variation laws of drought and waterlogging are analyzed by Markov's autoregressive equation and run -theory, and quantitative indexes are given.

    相关文章 | 计量指标
    THE MIRE IN NORTHEAST OF CHINA
    张养贞, 牛焕光
    1993 (3):  238-246. 
    摘要 ( 1020 )   PDF(440KB) ( 978 )  

    The northeast region is one of the principal mire distribution regions in China. According to the process of peat formation and accumulation , middle geomorphology type controlling water source supplement and the plant cover, 2 types, 10 subtypes and 27 mire bodies are divided. The mire area decreases gradually from north to south. There is more peat mire in the mountain and there is mainly gley mire without peat in the plain. The paper also explains the mire types in the principal mire distribution region and the utilization of mire in the fields of agriculture, forest, animal husbandry. The mire is a wetland ecosystem. It can reserve a lot of water, adjust rivers, humidify air. Thereby , attention must be paid to protecting ecological balance in the process of reclaiming mire and the mire protection.

    相关文章 | 计量指标
    THE DISCOVERED DEEP BURIED LAKE ICE IN SOURCE REGION OF THE HUANGHE RIVER
    王绍令, 李位乾
    1993 (3):  247-254. 
    摘要 ( 813 )   PDF(385KB) ( 826 )  

    The 4.45 m-thick pure ice lens have been discovered firstly at depth from 19.81 -24.26 m in the bore No.6, which locates in north bank of the Ngoring Lake. In source region of the Huanghe (Yellow) River, 14C dating, X -ray diffraction, pollen analysis, micropalaeontology, chemical components, environmental isotope 2H, 3H, 18O and freezing point of the ice and water samples from the bore have been tested and microorganism in the ice have been also appraised with microscope. Combined with the research on geomorphy and Quaternary around the lake, the ice lens are determined as a kind of deep-buried lake ice, formed in 35,030-45,209 yr.B.P., and annual mean air temperature was about -10℃ during that time.

    相关文章 | 计量指标
    INDUSTRIAL LINKAGES AND RURAL INDUSTRIALIZATION: A CASE STUDY OF HENAN PROVINCE, CHINA
    李小建
    1993 (3):  255-263. 
    摘要 ( 746 )   PDF(431KB) ( 824 )  

    The fast growth of rural industry in China has generated regional development of large rural areas. What role does industrial linkages play in Chinese rural industrialization? This is a same question as the relation between industrial linkages and regional development which has been discussed for decades and no final conclusion reached. The paper pursues the discussion and focuses on rural areas in China with special reference to Henan Province. On the basis of data from an investigation on nearly 200 industrial enterprises, this study emphasizes that the linkages play a very important role in spreading development of industry in rural areas. It is recommended that the national policies should prompt industrial linkages to upgrade the technological level of rural industry and to integrate rural industry with urban industry.

    相关文章 | 计量指标
    THE BACKGROUND VALUES OF RARE EARTH AND RADIOACTIVE ELEMENTS IN WATER SYSTEM OF SOURCE AREA OF THE CHANG JIANG RIVER
    张立诚, 周克俊, 钱杏珍, 李岫霞
    1993 (3):  264-275. 
    摘要 ( 627 )   PDF(2626KB) ( 735 )  

    Using neutron activation analysis method we determined contents of rare-earth and radioactive elements (La, Ce, Nd, Sm, Eu, Tb, Yb, Lu, Cs, Rb, Sb, Sc, Sr, Ba, U, Th) in source water system of the Changjiang (Yangtze) River, which is mainly composed of the Tuotuo River, the Chumaer River, and the Buqu River. The contents of these elements in the unflltered water have a great variation and a close correlation with the water turbidity. The contents of these elements in filtered water only have a little variation and are lower than those in the unflltered water. The variations in contents of these elements in sediments are also very little. These elements in the unifiltered water are in geometric distribution, except Sc. Most of the elements in sediments are in arithmetic distribution, but Cs, Sb, Th, are in deviation distribution. The contents of most of these elements in the river source area correspond to the contents of fresh water of the earth. Most of these elements have a little variation in their contents in sediments. The variation coefficients of most of these elements are less than 30%. There are remarkable correlations between the contents of rare elements in sediments.

    相关文章 | 计量指标
    THE CATASTROPHE FORECAST OF THE ANNUAL SIDEMENT TRANSPORT BY DEBRIS FLOW IN JIANGJIA GULLY,YUNNAN PROVINCE, CHINA
    刘希林
    1993 (3):  276-283. 
    摘要 ( 1008 )   PDF(338KB) ( 774 )  

    On the basis of the observational data on the annual sediment transport by debris flow in recent 8 years, appling the catastrophe forecast method of Grey System Theory, this study has established the catastrophe model of the annual sediment transport by debris flow in Jiangjia Gully. It has forecasted the next potential catastrophic year in which the annual sediment transport will be over the catastrophic. threshold 2 million m3. Furthermore, it has introduced the "equal dimension-new information model", which makes the forecast be done continuously.

    相关文章 | 计量指标
    ESR DATING OF FLUVIAL SEDIMENTS USING GE CENTER IN QUARTZ
    业渝光, 和杰, 刁少波, 高钧成
    1993 (3):  284-288. 
    摘要 ( 703 )   PDF(271KB) ( 728 )  

    Using the Ge centers of quartz sediments, the buried ages of fluvial sediments were determined by ESR technique. The ESR ages obtained from Ge centers are consistent with the TL ages, correspond with their horizons, accord with the geological background, and every ESR age is available. In this paper, determination of total dose of natural radiation (TD) and the reliability of ESR age using Ge center are also discussed.

    相关文章 | 计量指标