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Table of Content

    15 December 1989, Volume 8 Issue 4 Previous Issue    Next Issue
    TURTHER OBSERVATIONS ON SOUTH CHINA SLOPELAND UTILIZATION AND AMELIORATION
    Huang Bingwei
    1989, 8 (4):  1-8.  doi: 10.11821/yj1989040001
    Abstract ( 835 )   PDF (2631KB) ( 467 )   Save
    The problem under consideration is further discussed under three sections.In the first section,the economic significance of slopelands in South Chins is re-examined in the light of additional information.Special reference is made to the possible reduction of arable laad resulting from the rise of sealevel that may occur as a consequence of global warming.The present productivity of land on the slopes of hills and mountains is very low.Higher productivity will no doubt lead to a decrea.se of CO2 in the atmosphere.As the slopes are mostly well drained,the generation of other "greenhouse" gases can be easily kept to a minimum.
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    A MODEL OF PORTCITY DEVELOPMENT
    Wu Chuanjun, Gao Xiaozhen
    1989, 8 (4):  9-15.  doi: 10.11821/yj1989040002
    Abstract ( 532 )   PDF (570KB) ( 573 )   Save
    The development of portcity has been paid much attention to in China since 1978,but most of the researchers studied ports and portcities separately.However,this paper tries to link them together,studying the economic development of portcity on the basis of portcity interaction theory,The author believes that the three driving forces which play an important role in the urban development are.portcity direct linkage,portcity indirect linkage and the self-growing process of portcity.The analysis of the characteristics of driving forces indicates that there are distinctly different periods in the movements of driving forces combination.Because of the evolution of driving forces combination,the developing process of portcity appears to be composed of three stages,the stage of primary commercial economy,the stage of port-industrial economy and the stage of multiple economy.Having studied the history of seaports and portcities in North China,the paper discusses factors affecting the direction and the speed of the development of portcities,The universality and applicability of portcity development model are also discussed in the article.
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    AN ESTIMATION OF CROPS’ PRIMARY PRODUCTIVE POTENTIALITIES AND POPULATION-CARRYING CAPACITY OF LAND OF THE GUANZHONG AREA, SHANXI PROVINCE
    Liu Lihua
    1989, 8 (4):  16-27.  doi: 10.11821/yj1989040003
    Abstract ( 660 )   PDF (818KB) ( 978 )   Save
    In this paper,the methods of estimating crops' primary productive potentialities and population-carrying capacity of land are demonstrated,considering factual case of the studied area.Based on land type classification and land resource evaluation of Guan-zhong area,as well as the definition of kinds of crops and their cultivated system,food crops'primary productive potentialities and population-carrying capacity of land of different natural districts (the lowest level of physico-comprehensive regionalized units) are estimated.In addition,the results of estimation of different natural districts are analysed and compared with each other
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    EXPERIMENTAL STUDY OF RAINSPLASH EROSION PROCESS BY MULTIVARIATE ORTHOGONAL DESIGN
    Cai Qiangguo, Chen Hao
    1989, 8 (4):  28-36.  doi: 10.11821/yj1989040004
    Abstract ( 766 )   PDF (653KB) ( 928 )   Save
    Laboratory investigation of rainsplash erosion on Malan Loess has been conducted based on a multivariate orthogonal design.Five factors including rainfall intensity (I),cover density (V),rainfall duration (T),antecedent soil moisture content (C),and slope angle (A)were considered.In total,three replicates of 27 sets of experiments,each representating a different combination of the factors selected,were conducted.Regression equations using rainsplash detachment and rainsplash transport as dependent variables and derivatives of the five selected factors as independent variables were computed:What is significant is the inclusion of six and four interaction terms in the equation for splash detachmet Y and splash transport Z respectively.The analysis of results obtained from two equations shows that the interaction effects among some of the controlling factors of rainsplash erosion are of paramount importance.
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    ANALYSIS ON THE LOCAL CLIMATIC CHARACTERISTICS OF THE HONGSHUIHE-QIANJIANG-XUNJIANG RIVER BASINS
    Huang Hongfeng, Yan Qin
    1989, 8 (4):  37-44.  doi: 10.11821/yj1989040005
    Abstract ( 661 )   PDF (569KB) ( 578 )   Save
    Hongshuihe-Qianjiang-Xunjiang river traverses the middle part of Guangxi Basin The river basins have rich hydroelectric resources and mineral resources.Based on the climatic data during the period of 1951-1930 in the river basins at 33 stations and the microclimatic observations from 1985-1987 at the relative river segments,the main climate conditions and the microclimate produced by the river are analysed in detail.The results in this paper provide a scientific basis for exploiting and utilizing the resources in the river basins.Two processes through which the effects of river on local climate are formed,one produced by advective transport and the other caused by the river-land thermal circulation,are presented in.this paper,to expound the mechanism of the river effects on local climate.
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    SEDIMENTARY CHARACTERISTICS IN THE MODERN YELLOW RIVER DELTA
    Li Shuanke
    1989, 8 (4):  45-55.  doi: 10.11821/yj1989040006
    Abstract ( 724 )   PDF (811KB) ( 501 )   Save
    This article studies the quantity,grain size,and distribution characteristics of the deltaic sedimentary,also sedimentary structure and construction of the delta.The following conclusions are obtained.(1) In every subdeltaic construction,the thickness,velocity and land sedimentary ration are in relation to their living time and abandoned pattern.There is a maximum in every subdeltaic sedimentary.(2) The coarsest grained-grad is 0.25mm,and principal composition is salt sand and clay.There is nonrolling components of sedimentary.(3) The sedimentary structures are in relation to the hydrodynamics and grain size of sediments.The distribution and construction of the deltaic sedimentary is a reflection of the characters of the deltaic development.
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    THE RELATIONSHIP BETWEEN THE TECTONIC LANDFORMS AND STRUCTURES IN THE WEIHE RIVER BASIN
    Hu Mengchun
    1989, 8 (4):  56-64.  doi: 10.11821/yj1989040007
    Abstract ( 1209 )   PDF (643KB) ( 748 )   Save
    The Weihe River Basin stands where the four tectonic systems of Qilu,Qin-ling,latitudinal direction,cathaysian and Longxi roll-up intersect,such tectonic characteristics lay a basis for the formation of tectonic landforms of the basin.According to the tectonic structures and formation causes,the tectonic land-forms in the Weihe River Basin can be classified into eight types and each type can be divided further into correspondent based on neotectonic movement characteristics.These geomorphic sequences,which stretch into belts in east-west direction,have lomologous features in north-south direction and possess terracing spatial variations,Under the control of major tectonic systems in the Weihe River Basin,the graben structure with its own features serves as main cause for estabishment of the landform spatial arrangement.The development of tectonic landforms in the Weihe River Basin underwent three stages,namely,preparation stage of Mesozoicera,Tertiary establishment stage and Quaternary completion stage.
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    A HISTORICAL GEOGRAPHICAL STUDY ON THE VIOLET BAMBOO SHOOT TEA OF GUZHU, CHANGXIN COUNTY, ZHEJIANG PROVINCE
    Chen Liangwen
    1989, 8 (4):  65-71.  doi: 10.11821/yj1989040008
    Abstract ( 656 )   PDF (484KB) ( 617 )   Save
    The Violet Bamboo Shoot Tea of Guzhu,Changxin county,Zhejiang Province has been famous ever since middle Tang Dynasty (760A.D.),it was required to pay tribute,together with the Golden Sand Spring flowing out of the tea garden,to the Chinese emperors.Through present geographical study,it shows that the biochemical compositions of both of them are fine indeed,besides their very good prestige in Chinese history; therefore,the tea garden and the spring source should be well protected,exploited and utilized today.Morerer,in the future,the expansion of the Violet Bamboo Shoot Tea production is possible in the Changxin areas.
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    THE PALEOENVIRONMENT OF THE COASTAL REGION, SOUTH CHINA DURING THE LAST GLACIAL MAXIMUM OF LATE PLEISTOCENE
    Yang Dayuan, Feng Wenke, Chen Junren
    1989, 8 (4):  72-77.  doi: 10.11821/yj1989040009
    Abstract ( 839 )   PDF (478KB) ( 542 )   Save
    In this paper,mainly based on the studies for some time past,the authors summarized the paleoenvironmental features of the coastal region of South China during the full-glacial period of Late Pleistocene.They estimated the difference in the environment conditions between modern a.d LGM as follows.(1) On the average,the winter temperature of the land was lowered 11-15℃ or so.(2) The paleochannel bottom reached a depth of -62m or so at the present debouch of the Zhujiang delta,(3) The paleo-coastline was situated at 150m or so below the present sea-level.(4) The February temperature of the upper water in the northern part of South China Sea was lowered about 4.6-2.2℃ The above-mentioned features resulted from increasing of winter monsoon in the coastal region of South China and from increasing of north-east monsoon drift in the northern part of South Chins Sea during the last glacial maximum of Late Pleistocene
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    STUDY ABOUT THE CONSEQUENCE FOR RUNOFF AND INFLUENT BY SLOPE’ S VEGETATION
    Man Kaiyan, Lin Zhuoying
    1989, 8 (4):  78-85.  doi: 10.11821/yj1989040010
    Abstract ( 648 )   PDF (516KB) ( 746 )   Save
    This article dissertates about the consequence for runoff and influent by slope's vegetation and determines the relation of vegetation coverage density with watercourse on lamina,vegetation coverage density with influent on slope,precipitation intensity with influent on slope.The outcome of study allestes that flow of water on lamina and influent on slope sensibly increases vegetation coverage density or precipitation intensity.The flow on lamina is 25-30% of all precipitation when vegetation coverage density attains 95%.Vegetation reduces slope erosion by precipitation,increases the influent,raises the content of water in soil,has effects on the keeping the soil and water on slope.
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    A STUDY OF THE SOILS ON THE NORTHERN SLOPE OF THE NANSHAN MOUNTAINS IN THE QINGSHUI RIVER WATERSHED
    Wu Yuezhao
    1989, 8 (4):  86-95.  doi: 10.11821/yj1989040011
    Abstract ( 599 )   PDF (724KB) ( 546 )   Save
    This paper describes the physical geographical conditions for the soil formation of the Nanshan Mountains in the Qingshui river watershed.On the basis of field observations and chemical analyses in the laboratory,the profile features,physical and chemical properties,and the vertical distribution regularities of the major soils of the region(the calcic drab soil,the typical drab soil,the leached drab soil,the typical burozem,and the herbaceous burozem) have been carefully studied and summarized.At last,the spectrum of vertical soil zones on the northern slope of the Nanshan Mountains is established which points out that the base soil zone the region is constituted by the calcic drab soil and that the soil distributing at the upper most part is the herbacceus burozem
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    GEOGRAPHIC VARIATIONS OF THE COMPOSITIONS OF SUSPENDED MATTER IN THE YELLOW RIVER
    Qu Cuihui, Yan Rune
    1989, 8 (4):  96-105.  doi: 10.11821/yj1989040012
    Abstract ( 589 )   PDF (729KB) ( 570 )   Save
    Huanghe is located in semidry and semi-humid areas and temperate climate zone.The soil formation processes have been disturbed by extremely serious soil erosion.The compositions of suspended matter in the Huanghe (Yellow River) were controlled by physical weathering.This was indicated by the following observations.1) Most of the suspended matter,no matter from upper,middle or lower reaches,was products of physical breakdown of existing crystals,such as quartz,feldspar,mica and chlorite,2) The differences in grain size distribution between the suspended matter in middle reach and loess may be only due to deposition of coarse particles during transport by water,3) Correspondingly,the quartz content,which makes up the major part of coarse particles,is lower than that in loess,and the contents of feldspar and mica are higher.
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