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  • 1993 Volume 48 Issue 4
    Published: 15 July 1993
      
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  • REGIONAL DIFFERENTIATION OF CRITICAL CONCENTRA-TION AND ENVIRONMENTAL CAPACITY OF SOME HEAVY METALS FOR THE MAIN SOIL TYPES IN CHINA
    Xia Zenglu
    1993, 48(4): 297-303. https://doi.org/10.11821/xb199304001
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    According to the results of a 8 year comparation study，the distribution of critical concentra-lion and environmental capacity of Cd，Pb.Cu，As in laterite.crimson earth.red earth，purplish soil .yellow brown earth .brown earth .black soil，dark soil and sierozem soil in China is discussed. The results show that for most of heavy metals.the critical concentration and environmental ca- pacity differ considenrable in different soil types which distribute from the south to the north and from the east to the west。and have a zonal differentiation. For Cd, Cu they are increased from the south to the north and from the east to the west，and for As they are decreased from the southto the north and from the east to the west.
  • A PRELIMINARY STUDY ON VARIATIONS OF THE DISTRIBUTION OF ZHANG-DISEASE FOR THE PAST 2000 YEARS IN CHINA
    Gong Shengsheng
    1993, 48(4): 304-316. https://doi.org/10.11821/xb199304002
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    Zhang一disease（瘴），which is an epidemic in the southern part of China in the historical pe-rinds ,is a kind of pernicious malarias .This paper discusses preliminarily the links between this disease and geographical environment。the variations of its distribution and its influence on the so-ciety and economy in the region affected by Zhang一disease. The followings conclusions have been obtained: (1) Zhang一disease is an epidemic which occurs under hot and wet climatic conditions in summer and autumn. (2)In the past 2000 years，the disease was moved slowly to the South. The Northern bound-ary of the region affected by Zhang一disease was Qinlin Mountain and Huaihe River in the War-ring States Period and in the Western Han Dynasty(770BC一AD23)，Daiba Mountain and Changjing River in the sui and Tang Dynasties (AD581一960)，and Nanlin Mountain in the Ming and Qing Dynasties (AD1368一1911).At the present time. Zhang一disease is an epidemic only in the Yunnan Province. One of the main causes the movement of Zhang一desease is the population migration from North to south .Another reason is the change of climate to colder and drier. (3)Zhang一disease influences the society in the region affected in three aspects:population growth，production mode and economic development. These influences resulted in the fact that the northern parts of ancient China were exploited prior to the southern parts.
  • THE STUDY OF THE URBAN FRINGES IN CHINESE MEGALOPOLISES
    Gu Chaolin, Chen Tian, Ding Jinhong, Yu Wei
    1993, 48(4): 317-328. https://doi.org/10.11821/xb199304003
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    The authors made a survey of the current situation of Chinese megalopolises.such as Beijing，Shanghai,Guangzhou,and Nanjing,and found that changes of the urban fringes in these cities are more and more important because the urban economic made a great progress since the reforming and opening of China .This paper focused on the study of the urban fringe's specific properties in the Chinese megalopolises. Firstly，this paper discusssed the division of the urban fringe on the base of the survey of Guangahou city. The urban fringe consists of two parts,i e，the inner fringe and the outer fringe. The urban-rural continuum is only one part of the inner fringe. Secondly， this paper expounded in details the characteristics of the urban fringe in Chinese Megalopolises,in- eluding:(1)the density of population and the population structure; (2) the community structure， sociometry and social problems;(3)the economic structure and patterns of the diversified econo- my and(4)the impact of urban expansion on agricultural Land. Finally .this paper discussed also the evolution laws of the spatial expansion in the urban fringe，such as the Beijing model，the Shanghai model,the Wuxi model and the Guangzhou model.
  • A CASE STUDY ON ECONOMIC DEVELOPMENT IMPEDED BY ADMINISTRATIVE REGIONALIZATION—TAKE TAIZHOU AND ITS RELEVANT PORT—GAOGANG AS AN EXAMPLE
    Chen Chuankang, Deng Zhongquan
    1993, 48(4): 329-336. https://doi.org/10.11821/xb199304004
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    In a protracted developing course of regional economy , Taizhou city becomes a central city of Taizhou Economic Region in the middle part of the lower reaches of Yangtze River. It is a city in which the economy is growing in the middle part of Jiangsu Province. Because there was not enough time to do demonstration of regional planning when the administrative system in which cities administer counties was tried，original Yangzhou prefecture，which vast land and a large population，was simply changed to be an area under Yangzhou City's jurisdiction. The quality and effect of Taizhou City has not been clearly understood ,and the administrative regionalization suit-able for the cevelopment of economic region has not been defined. Taizhou City is separated from its hinterland in the administrative system. The central city and its exporting port , Gaogang , is also separated. As a result，Taizhou City，was regarded as a "suburbs town"under the Yangzhou City Government,and its ability of comprehensive service has been decreased. Taizhou Economic Re- gion can not coordinate and strengthen its regional basic installations effectively. The improve- ment of its investing environment is slow ,and the capability of economic competition is weak. The difference in developing rates between Taizhou and other economic regions in Jiangsu Province a- long the Yangtze River is increasing. The irrational administrative regionalization makes it diffi-cult for Taizhou，the regional central city，and Gaogang，one of the key ports along the Yangtze River，to expand. Taizhou-Gaogang phenomenon that restricts development of regional economy has been formed.
  • COMPARATIVE STUDY OF NEW ZEALAND LOESS WITH CHINA LOESS
    Xia Zhengkai, Bruce JG, Crozier MJ
    1993, 48(4): 337-347. https://doi.org/10.11821/xb199304005
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    The term loess，used in New Zealand,is applied to any fine一textured deposit of eolian origin other than sand dunes. It has been under investigation for over one hundred years and a variety of interesting results has occurred. based on the morphologic,sedimentologic，mineralogic , chemical，and paleopedologic analyses of 12 samples from 8 cropping loesa field.
  • AN ANALYSIS ON COLD/WARM AND DRY/WET IN SHANDONG PROVINCE DURING HISTORICAL TIMES
    Zheng Jingyun, Zheng Sizhong
    1993, 48(4): 348-357. https://doi.org/10.11821/xb199304006
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    In this paper .the series of winter temperature index for each decade and seasonal dry wet in-dex arc reconstructed，the characteristics of cold warm and dryness/wetness variation in Shandong Province during historical times are analysed.
  • A STUDY ON THE EFFECTS OF THE HEAT AND WET ISLAND IN THE CITY OF CHONGQING DURING WINTERTIME
    Li Zihua, Tang Bin, Ren Qifu
    1993, 48(4): 358-366. https://doi.org/10.11821/xb199304007
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    By using the observational data obtained in the city of Chongqing about the boundary layer meteorology in the period from Dec. 15，1989 to Jan. 15，1990,analysis is made on the horizontal distribution vertical structure of the urban heat island ,and the factors affecting its intensity. The wet island accompanying with the city's heat island is also analyzed. The Results indicate that af- ter 20：00 the center of the city and the Changjiang River wcrc shrouded in an arched layer of warm and humid airs. The air temperature and specific humidity at the heights of 200一300m above the river surface were considerably higher than those in the suburban areas. With the shift of mountain wind to valley wind , the structures of the heat and wet islands disappear at 14:00 of the next day.
  • Evolution and Pissipative Structure in the Drainage-geomorphic system
    Ma Xin Zhong
    1993, 48(4): 367-376. https://doi.org/10.11821/xb199304008
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    In this paper .the concepts of entropy ,flux and force in the drainage-geomorphic system have been introduced ,and an equation for the entropy production and super-entropy production has al-so been conducted，According to this concept,dynamic mechanism in the drainge-geomorphic sys-tem is analysed ,and an evolutional model for the development the drainage-geomorphic system in a hill-gully area on the loess plateau is developed. The model is suitable for the entire process of drainage-geomorphic system. By using this model the erosional cycle in the hill-gully area can be divided into three stages. By quantitatively analysing the Erosional Cycle Theory of Davis and dif-ferent soil erosions at the different stages，non一uniform erosional properties of a drainage-geo-morphic system in space is also founded.