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    Chen Guojie
    SCIENTIA GEOGRAPHICA SINICA    1997, 17 (1): 1-7.   DOI: 10.13249/j.cnki.sgs.1997.01.1
    Abstract1601)      PDF (544KB)(783)      
    The formation and enlarging of economic development gaps between the east, centre and west in China resulted from long time evolution by comprehensive effects consisting of historical, natural and social factors. Contemporary unbalance of regional economic development enlarges the gap of economic grades in the three parts of China. It is a good way for the western China to carry out the strategy of overall opening to outside world, but it should emphasize to connect with the Pacific Area and the eastern and central parts of China. Meantime, it is not negligent for the western part to accelerate the construction of trafic trunk connecting the west with the east.
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    Cited: Baidu(76) CSCD(24)
    Huang Peihua, R. F. Diffendal, Jr., Yang Mingqin, P. E. Helland
    SCIENTIA GEOGRAPHICA SINICA    1998, 18 (5): 401-408.   DOI: 10.13249/j.cnki.sgs.1998.05.401
    Abstract380)      PDF (1302KB)(215)      

    Huangshan (Yellow Mountain) is located in south part of the lower reaches of the Yangtze River, 30°31′N and 118°11′E. It is composed of the Huangshan granite and its highest Lotus Flower Peak is 1864 m above sea level. It is one of the World Natural and Cultural Heritage List by UNESCO in 1990. Intrusive age of the Huangshan granite was dated 120-125 Ma, in Cretaceous. The granitic pluton uplifted and formed granitic mountains in the first episode of Himalayan movement, about 50 Ma. The mountains were eroded a denudation surface with low hills and shallow valley of late mature stage, this erosive stage is called Bright Summit Stage, about 30 Ma, the first dedudation surface at the mountain top is 1600-1800 m above sea level now. The second denudation surface was a lower mountain and wide valleys of mature stage after the second episode of Himalayan movement (about 20 Ma). The formation stage of the second denudation surface is called Old Man Peak Stage, about 5 Ma. Its height is 1100-1500 m above sea level now. The Huangshan granitic pluton with its first and second paleo denudation surfaces was uplifted by the Late Himalayan Movement along the mountain front fault zones in the Quaternary. It was eroded by streams to form deep canyons and middle mountains at present. The piedmont belt of Huangshan was a humid forest environment of subtropics in the Middle Pleistocene. At valley mouth of the southeastern piedmont belt distribute some pluvial fans which consist of red boulder clay in the Middle Pleistocene. The top of Huangshan was a cold frozen active environment in the last cold stage of the Late Pleistocene, the stage corresponded to the last Dali glaciation in western China, about 20 ka. The granitic mass of the mountain top part was degradeted and dilapidated along joints and crevices due to frost work, not glaciation, and formed beautiful peaks and fascinating rocks. Porf. Lee has proposed that the “confirmatory evidence of Pleistocene glaciation from Huangshan” is questionable and the “glacial evidence” is also discussed in this paper.

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    Artificial Neural Network Evaluation of Nutrient States of South Lake Water in Changchun
    LU Wen-xi, ZHU Ting-cheng
    SCIENTIA GEOGRAPHICA SINICA    1999, 19 (5): 462-465.   DOI: 10.13249/j.cnki.sgs.1999.05.462
    Abstract416)      PDF (160KB)(44)      
    Artificial neural network was developed to evaluate the nutrient states of South Lake water in Changchun in this paper. Taking Chemical Oxygen Demand, Tolal Nitrogen and Total Phosphorus as evaluation parameters and after repeating attempts, the four-layer structural Error Back Propagation network was established to evaluate lake nutrient states.There are three neural units in input layer, four in both hidden layers, and one in output layer. Taking the evaluation criterion of lake nutrient states as sample pattern, the network was trained in the light of learning rule of Error Back Propagation network. After 39?925 tries, the network reached the convergence standard given in advance. The operation process of the network is simple and convenient, and the results indicate that South Lake water in Changchun is, on the whole, in the state of extreme eutrophication.
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    Cited: Baidu(12)
    Li Wenbo, Zhai Guihua, Su Hongshi, Hu Xingda, Wang Tongyan, Du Zhaozhong, Song Zichun, Zhao Limin
    SCIENTIA GEOGRAPHICA SINICA    1998, 18 (1): 80-87.   DOI: 10.13249/j.cnki.sgs.1998.01.80
    Abstract503)      PDF (908KB)(124)      
    This article makes a detailed study of changes in geomorphologic landscape with the guide of air pollution meteorology. The article discusses changes in the area of city for surface roughness. That leads to changes in atmospheric boundary layer that form special wind field and temperature field in the districts of the city. The phenomenon of thermal is land and calm has changed the districts of atmospheric environmental capacity for pollutants. There is a trend of worse pollution in some districts. All these provide a scientific basis and aim at policy for making plans of city’s development and measures aginst air pollution in the future.
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    Cited: Baidu(7) CSCD(3)