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  • 1992 Volume 12 Issue 3
    Published: 30 July 1992
      

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  • Deng xiamrui, Liu Weidong
    1992, 12(3): 195-201.
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    In this paper, the relation between comprehensive physical regionalization and land type is discussed.It is pointed out that land type is the basis of physical regionalization from lower to upper level, and it can make the delimitation more accurate, landscape comparison structure, spatial arranging atructure and temporal succession structure of land type as well as the basic principles of physical regionalization are analysed for exploring the law of the origin and development of the natural evironment and areal differentiation.A quantitative method of physical regionalization from lower to upper level, namely the cluster analysis technique, is suggested and the authors consider that it surely can greatly increase the objectivity in physical regionalization as less affected by man-made factors.
  • Pan Mao, Yun Zukeng, Ma Mingliu, Zheng Chunjiang, Mo Dingxin
    1992, 12(3): 202-209.
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    The Quaternary strata along the main reaches of the Beijiang River in Guangdong Province are poorly developed and less studied.The main characters can be summarized as being;(1) discontinuity in spatial distribution;(2) incompletion in time distribution;(3) small thickness;(4)lack of fossils.Through detailed field surveying,mainly by means of geomorphological correlation(terraces and caves),sediment analyses,14C and U-series timing,combined with drilling,a division scheme of the Quaternary strata in this region is put forward. 1.The red-clayey conglomerates on the third terrace in Shaoguan Basin may have been formed in Early Pleistocene(Q1) or earlier,while in Yingde Basin,the third terrace is under-developed,only developed the first and second tarraces, which can be correlated with their counterparts in Shaoguan Basin.The conglomerates on the second terrace were formed earlier than Maba Man fauna and later than Early Mid-Pleistocene(Q21).The yellow clayey silts on the first terrace were formed in Early Holocene(later than 18000-19000 a B.P.).2.Qingyuan Basin is significantly different from Shaoguan and Yingde Basins.There is no statum of Lower or Middle Pleistocene,Only a thin cover of late Pleistocene fluvial sediments(Q33)overlying on the weathering mantle of basic rocks.The Holocene strata of this basin developed well,whose thickness being 20-30 m,and geomorphologically being a wide fluvial plain.From bottom to top,the Holocene strata can be subdivided into four formations: Sanjiao Formation,Henglan Formation,Wanqinshan Formation and Denglongsha Formation.The time of each formation is respectively 7500~12000 a B.P.,5000-7000 a B.P.,2500-5000 a B.P.and 2500 a B.P.The sands and gravels at the bottom of Sanjiao Formation may belong to Upper Pleistocene.
  • Li Siping
    1992, 12(3): 210-213.
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    The landslide in weathering granite crust as a type of soil erosion is widely distributed in soil erosion regions of Guangdong Province, and its forming process is of special Law.The characteristics of landslide in weathering granite crust of Guangdong as well as its internal forming mechanism and environmental factors are analysed in this paper.It is considered that the subtropical wet climate of Guangdong contributes to the formation of landslide,the failure of slope is directly related with the angle and direction of slope,conditions of plant and precipitation.Landslide should be controlled by the measures of afforestation and drainage.
  • Cai Renqun
    1992, 12(3): 214-220.
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    Five issues of the infrastructure construction in the Zhujiang Delta,including Guangzhou international airport,the key ports of South.China,Guangzhou-Zhuhai-Macao railway,large thermal power plants, and the water diversion works from west to east,are discussed in this paper.The author considers that(1)Although there are airports in Shenzhen,Foshan and Huizhou,Guangzhou(Baiyun) airport,one of the three largest international airports in China, will be saturated before 2000,and it should be replaced by a new large international airport.(2) Guangzhou port as the centre,and Shenzhen port(including Yantian and other ports in west Shenzhen) and Gaolan port of Zhuhai as two wings,should cooperatively undertake the task of the key ports of South China.(3) Guangzhou-Zhuhai-Macao railway should be built, as it will promote the regional economic development.(9) As the existing large thermal power plants are concentrated unduly near Humen,the new ones should be distributed along the coast of the Zhujiang Delta,cooperating the port projects.(5)It may be necessary to construct water diversion storks from west to east so as to thoroughly solve the problem of water supply for Guangzhou City proper and the coastal areas of the Zhujiang Mouth,including Shenzhen,Bao-an,Daya Bay and Hongkong.
  • Zhong Gongfu, Huang Fuxiang
    1992, 12(3): 221-227.
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    There are about 58,667hm2(1hm2=15mu) of low-lying land in Zhaoqing Municipality of Guangdong.At the beginning of the 1980 s,the dike-pong system was introduced into the municipality,and up till now some 6,667 hm2 of low-lying land have been transformed into dike-pond systems.The systems produce per year 150 million yuan of gross value of agricultural output for the municipality and 25:100 t of pondfish as well as a large quantity of fruits,duck eggs and pork supplied to market.From the practice,the local farmers have broadened the application field of the theory of dike-pond system.For example,they change the shallow bays of a reservoir into dike-pond system.Good benefits have been achieved in the last ten years,but there are still some problems,such as lack in funds for completing the system.Some suggestions to solve the problems are put forward.
  • Peng Yong'an
    1992, 12(3): 228-233.
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    The conditions for opening Dehong port of Yunnan are analysed:advantageous international environment,good locaton,broad market,rich internal and external resources,long trading history and stable borders.But there are also some disadvantages; undeveloped economy, small scale of towns and poor infrastruture.Dehong port is of special regional benefits and its orientation is different from that of coastal ports.The author suggests that(1)make mufti-level development of the port,(2)set up a continental bridge to South Asia,(3)open up southwest international trading passage,(9)construct inland export processing base and develop export-orientated economy in boundary minority nationality regions.
  • Xu Qingfeng
    1992, 12(3): 234-240.
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    In this paper, an index system for judging the urbanization level is advanced,which is composed of five indices and can be used in a district no smaller than a county.The five indices are:percentage of urban population,urban and town density,spatial distribution form of cities and towns, urban system,and urban population distribution.In an example analysis, the index sysytem is used to comprehensively judge the urbanization level of the suburban district of Shanghai, and to analyse the problems in the process of urban development in the district.For solution of the problems,some suggestions are raised.
  • Liao Jinxiong
    1992, 12(3): 241-247.
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    Situated in the Zhenjiang basin of Guangdong,Shixing was once a hub of communications between the South and North of the Nanling Mountains and played an important role in exploitation of ancient South China.During the Spring and Autumn Period,merchants traded with each other by way of Shixing.During the Qin and f-Ian Dynasty,it became a strategic point, an example was the famous Hengpu Pass in the Zhenjiang basin,which was built in the Qin Dynasty.In Chinese history,a great many people from North China moved into South China by way of Shixing.In the sixth Yong-an year(A.D.263) of Wu Kingdom,the culture and economy in Shixing were further developed with the county administrative system being set up.So Shixing is one of the most ancient counties in Guangdong.
  • Mao Zhengdan
    1992, 12(3): 248-255.
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    On the basis of the formula of Ellis etc.(1971):Tnef=0.492T.+0.19e.+6.47 using the monthly mean air temperature and the water vapour presure, the values of the new effective temperature are figured and then the climate comfort belts are delimitated.The conclusion is that latitude,landform,the positions of sea and land and atomospheric circulation are the basic elements which decide the distribution of new effective temperature,and each of them is of different actions in different seasons.The climate comfort belts are indicated by the new effetive temperature of 12.5-20.5℃.The results of the figures show that the distribution of the belts in China are of obvious regional distinction and seasonal variation.1n winter, the new effective temperature is generally lower,the north part of the Nanling Mountains is in a state of cold.In January the isopleth of 12.5℃ is distributed along the line of twenty-five degrees north latitude or the ridge of the Naming Mountains, and the comfort belt is confined to the south of the mountains.In April,because the 12.5℃ isopleth has moved to the north,the isopleth of 12.5℃ in January is replaced by that of 20℃,so the plain regions of East China belong to comfort belt basically.In July,except the north marginal areas and the Chinghai-Tibet plateau,most parts of China belong to heat-uncomfortable range.In October the 20.0℃ isopleth moves to the Nanling Mountains and the heat-uncomfortable range shrinks back to South China, and 12.5℃ isopleth moves southwards, then North China and the Chinghai-Tibet Plateau return to cold-uncomfortable again.
  • Wu Chisheng, Yang Pingzhang
    1992, 12(3): 256-263.
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    By using EOF(Empirical Orthogonal Function)method,the principal compqnents of the monthly mean geopotential height field at 100 hpa an and 500 hpa levels in May are obtained.The relations between the principal components and the rainfall in Guangdong during summer season are analysed.It is found that the first eigenvectyr represents mean climatic circulation and there are connections between the drought and flood in summer of Guangdong and the variation of the time coefficients of the 2nd,3rd and 9th eigenvectyr.Especially the variation tendency of the drought and flood in time scale of decade has good correlation with the variation of the time coefficients of the 9 th eigenvectyr at 100 hpa level and the 3rd eigenvectyr at 500 hpa level, and the correlation coefficients reach 0.86 and -0.74 respectively(reliability a<0.001).These correlations between the atmospheric circulation feature in early summer and the drought and flood in summer provide important leads for the climatic diagnosis and forecast of the drought and flood variation tendency in summer of Guangdong.
  • He Dong, Tan Weirui, Qiu Shitian
    1992, 12(3): 264-271.
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    Yangshan County is one of the areas in Guangdong where hail occurs more frequenfly.It hails one or two times per year in average.The hailstone appears mostly in spring and in the afternoon within a day.The Weather types of hail can be incorporated into three:frontal low type,shear line type and subtropical high type.The origin,path and intensity of hail are affected directly by geographical environments.Based on the analysis of hail damage in different places, the whole county can be divided into heavy damage region,medium damage region and light damage region.Some suggestions for reduction and prevention of hail damage are put forward.
  • Chen Jingsheng, Chen Mei
    1992, 12(3): 272-281.
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    According to water chemistry data from 1959 to 1989,the chemical characteristics and genesis of major ions of the rivers in Hainan Island are discussed.The annual mean content of dissolved solid in the rivers of Hainan Island(about 78 mg/l)is less than that in the large rivers of mainland China(140-400 mg/l),whereas contents of Cl- and H4SiO4 in the rivers of the island are evidently higher than that in most rivers of the mainland.Cl- are from ocean aerosols and H4SiO4 from weathering rocks.The major ionic composition in the river of Hainan Island is dominated by the weathering of aluminosilicates and the input of ocean aerosols, whlle that in most rivers of the mainland is influenced by the carbonates and evaporites.