2000 Vol. 10, No. 4
Display Method:
2000, 10(4): 289-295.
Abstract:
Based on analysis of the change of land use and related social- economic factors in karst mountain areas of southwestern China, the index system characterizing land use change and its human driving forces in county scale is put forward. Then the relationship of land use change and the driving forces is studied by statistic analysis to identify quantitatively the contribution of human forces and their differences in driving land use change. Moreover, taking the Luodian County as the case, a model simulating the annual change of cultivated land area under the driving of human forces is built. Result of the study will supply reference for the management of the relationship of man and land in karst mountain areas of southern- western China, and accumulate research experience for further study on land use/cover change.
Based on analysis of the change of land use and related social- economic factors in karst mountain areas of southwestern China, the index system characterizing land use change and its human driving forces in county scale is put forward. Then the relationship of land use change and the driving forces is studied by statistic analysis to identify quantitatively the contribution of human forces and their differences in driving land use change. Moreover, taking the Luodian County as the case, a model simulating the annual change of cultivated land area under the driving of human forces is built. Result of the study will supply reference for the management of the relationship of man and land in karst mountain areas of southern- western China, and accumulate research experience for further study on land use/cover change.
2000, 10(4): 296-301.
Abstract:
The estimated total area of wetland in China is more than 25.9 million hectares including about 11.9 million hectares of marshes and bogs, 9.1 million hectares of lake and about 2.2 million hectares of coastal salt marshes and mudflats. The area of wetland is equivalent to 2.7% of the land surface. China also has 2.7 million hectares of shallow sea water (less 5m in depth at low tide). Marshes and bogs are equivalent 1.3% of the land surface. Only three provinces(regions)— Qinghai, Xizang (Tibet)and Heilongjiang— have a larger total area of marsh and bog. According to the structure, type and development of wetland in different river basins, wetland can be classified nine main regions. The experiments indicate that the coefficient of the marsh to regulate flood is similar to that of lakes. Wetlands occupy 17.8% of the Sanjiang Plain area, the annual carbon contribution is 0.78× 104t. Carbon released from marsh soil return into atmosphere is 3.95× 106t/a. At present there is a sharp contradiction between population growth and natural resources shortage, causing wetland to be exerted with huge pressures and serious threats.
The estimated total area of wetland in China is more than 25.9 million hectares including about 11.9 million hectares of marshes and bogs, 9.1 million hectares of lake and about 2.2 million hectares of coastal salt marshes and mudflats. The area of wetland is equivalent to 2.7% of the land surface. China also has 2.7 million hectares of shallow sea water (less 5m in depth at low tide). Marshes and bogs are equivalent 1.3% of the land surface. Only three provinces(regions)— Qinghai, Xizang (Tibet)and Heilongjiang— have a larger total area of marsh and bog. According to the structure, type and development of wetland in different river basins, wetland can be classified nine main regions. The experiments indicate that the coefficient of the marsh to regulate flood is similar to that of lakes. Wetlands occupy 17.8% of the Sanjiang Plain area, the annual carbon contribution is 0.78× 104t. Carbon released from marsh soil return into atmosphere is 3.95× 106t/a. At present there is a sharp contradiction between population growth and natural resources shortage, causing wetland to be exerted with huge pressures and serious threats.
2000, 10(4): 302-308.
Abstract:
Water samples were collected and analyzed in high water season (July 1997) and in middle water season (October, 1997) from two main lower reach gauge stations of the Zhujiang (Pearl) River, namely Hekou and Makou, respectively. Content of particulate organic carbon is always higher than that of dissolved organic carbon in both seasons, which is obviously different from the global average pattern, i.e. dissolved organic carbon is the dominant component of the transported riverine organic carbon. The content of dissolved and particulate organic carbon changes with the water levels in a direct ratio. The percentage of organic carbon in total suspended substance changes with the content of total suspended substance in an inverse ratio. The more intense is the soil erosion in the drainage, the more concentrated is the riverine organic carbon in the river. The contribution of autochthonous organic carbon is larger in high water season than in middle water season.
Water samples were collected and analyzed in high water season (July 1997) and in middle water season (October, 1997) from two main lower reach gauge stations of the Zhujiang (Pearl) River, namely Hekou and Makou, respectively. Content of particulate organic carbon is always higher than that of dissolved organic carbon in both seasons, which is obviously different from the global average pattern, i.e. dissolved organic carbon is the dominant component of the transported riverine organic carbon. The content of dissolved and particulate organic carbon changes with the water levels in a direct ratio. The percentage of organic carbon in total suspended substance changes with the content of total suspended substance in an inverse ratio. The more intense is the soil erosion in the drainage, the more concentrated is the riverine organic carbon in the river. The contribution of autochthonous organic carbon is larger in high water season than in middle water season.
2000, 10(4): 309-318.
Abstract:
Located in the headwater upstream of the Taihu Lake region, which is a densely populated and economically develaped area in China, the West Tiaoxi River catchment is a frequently flood-hit area due to its nature and climatic characteristics. During the last several decades, more than ten catastrophic floods happened in this area, causing huge economic losses. Since 1990, due to the increasing property vulnerability to flood hazard, the disasters were even more serious than before, and economic losses increased year by year. Thus, there have great importance to study flood behaviors, flood risks and their consequences. In this paper the hydrologic/hydraulic modelling is presented firstly. It is the method to study the relationship between rainfall and runoff and the flood propagation process. Secondly, the author gives the summary of the current study methods for flood risk assessment. The West Tiaoxi River catchment has a farmlands have been protected against floods. So the long history cnmhinatinn of the construction of polders and hydraulic engineering methd has been 71 Sed used to nhtain the real risk area. The Most results have been obtained by using this method, which, the authors think, will be used in disaster preparedness, property Insnranee etc.
Located in the headwater upstream of the Taihu Lake region, which is a densely populated and economically develaped area in China, the West Tiaoxi River catchment is a frequently flood-hit area due to its nature and climatic characteristics. During the last several decades, more than ten catastrophic floods happened in this area, causing huge economic losses. Since 1990, due to the increasing property vulnerability to flood hazard, the disasters were even more serious than before, and economic losses increased year by year. Thus, there have great importance to study flood behaviors, flood risks and their consequences. In this paper the hydrologic/hydraulic modelling is presented firstly. It is the method to study the relationship between rainfall and runoff and the flood propagation process. Secondly, the author gives the summary of the current study methods for flood risk assessment. The West Tiaoxi River catchment has a farmlands have been protected against floods. So the long history cnmhinatinn of the construction of polders and hydraulic engineering methd has been 71 Sed used to nhtain the real risk area. The Most results have been obtained by using this method, which, the authors think, will be used in disaster preparedness, property Insnranee etc.
2000, 10(4): 319-325.
Abstract:
Since 1978, many changes have happened on the background of urban regional structure in China, such as the economy system restructuring, the social transforming including the population flow accelerating and social demand diversifying and individualizing, the political and economic systems reforms, the rise of the real estate market and the changing relationship between human and nature. From the macroscopic view, these changes make the national urban system to be a newer pattern with a widening gap among the cities in spite of the rising of the cities as a whole. At the same, the urban land use structures are changing with both the trends of intensification and diversification, and the trends of the regional diversification and the economic integration. Besides, urban structures with multiple centers are emerging in several metropolitan areas in China. These changes and trends mentioned above are confirmed by a case study of Nanjing City, a growing metropolitan area in east China. The case study also points out some problems in urban regional structure reforming, especially the poor social and ecological considerations. We should pay more attention to some ideas like balance of intensification and decentralization, development of suburban centers and a reasonable mixing of the functional activities to develop a sustainable urban regional structure.
Since 1978, many changes have happened on the background of urban regional structure in China, such as the economy system restructuring, the social transforming including the population flow accelerating and social demand diversifying and individualizing, the political and economic systems reforms, the rise of the real estate market and the changing relationship between human and nature. From the macroscopic view, these changes make the national urban system to be a newer pattern with a widening gap among the cities in spite of the rising of the cities as a whole. At the same, the urban land use structures are changing with both the trends of intensification and diversification, and the trends of the regional diversification and the economic integration. Besides, urban structures with multiple centers are emerging in several metropolitan areas in China. These changes and trends mentioned above are confirmed by a case study of Nanjing City, a growing metropolitan area in east China. The case study also points out some problems in urban regional structure reforming, especially the poor social and ecological considerations. We should pay more attention to some ideas like balance of intensification and decentralization, development of suburban centers and a reasonable mixing of the functional activities to develop a sustainable urban regional structure.
2000, 10(4): 326-334.
Abstract:
Twenty years'economic reform and open door practice have made China not only an important host nation to foreign direct investment (FDI), but also the largest FDI home nation among the developing countries. In fact, since the late 1980s, the Chinese government has not simply put its effort into exporting "made-in-China" products to earn foreign currency or into encouraging foreign inward capital, but also actively encouraged its manufacturers to invest overseas. This paper examines China's outward FDI and poses the question to what degree China is expected to follow the other East Asian economies or will it forge its own particular patterns. The first section of this paper reviews the characteristics of FDI of China's neighbors and then it turns to examine the spatial patterns of and motivations for China's FDI. Finally, this paper looks at potential of China's outward investment in the near future. It concludes that China is not Japan but its potential for further outward FDI is huge. With its WTO membership and growing economy, China will become the second to Japan or USA. It will also use its financial power to further contain Taiwan's independence.
Twenty years'economic reform and open door practice have made China not only an important host nation to foreign direct investment (FDI), but also the largest FDI home nation among the developing countries. In fact, since the late 1980s, the Chinese government has not simply put its effort into exporting "made-in-China" products to earn foreign currency or into encouraging foreign inward capital, but also actively encouraged its manufacturers to invest overseas. This paper examines China's outward FDI and poses the question to what degree China is expected to follow the other East Asian economies or will it forge its own particular patterns. The first section of this paper reviews the characteristics of FDI of China's neighbors and then it turns to examine the spatial patterns of and motivations for China's FDI. Finally, this paper looks at potential of China's outward investment in the near future. It concludes that China is not Japan but its potential for further outward FDI is huge. With its WTO membership and growing economy, China will become the second to Japan or USA. It will also use its financial power to further contain Taiwan's independence.
2000, 10(4): 335-342.
Abstract:
The Xijiang River is an important link between Guangdong Province and the Guangxi Zhuang Autonomous Region, and a tie between its basin and the world. The zone which consists of 12 cities backing onto the main channel, including Guangzhou, Shenzhen, Nanning and Bose, etc., is an economic growing point and industry spreading origin of all the river basin. According to the nonagricultural population scale, these cities are divided into four grades. By analyzing seven indexes (GDP, nonagricultural population, gross values of industrial output, postal and telecommunication service scales, social commodity total volume of retail sales,resident saving balance, student sum in college), these cities are divided into four kinds of growing points, which show the different radiating function in different regions. The 12 cities, which have differed obviously in industry structure and the scale of the secondary &tertiary industry, are divided into three industry steps. By studying the difference of urban industrial function specialization in the 12 cities, the problems have been revealed in the urban industry structure developing. They are about the lower levels of the three industries, the lack of coordination with city status in the development of specialized departments, the similarity of the industry structure and the specialized departments, and so on. Based on the pattern of urban industry structure developing and the theory of regional economic step transferring, some suggestions have been discussed. They include the trends of cities'industry developing, the change and improvement of the percentage of the three industries, the adjustment and amendment of the region and industry structure, and the labor division and location of cities manufacture.
The Xijiang River is an important link between Guangdong Province and the Guangxi Zhuang Autonomous Region, and a tie between its basin and the world. The zone which consists of 12 cities backing onto the main channel, including Guangzhou, Shenzhen, Nanning and Bose, etc., is an economic growing point and industry spreading origin of all the river basin. According to the nonagricultural population scale, these cities are divided into four grades. By analyzing seven indexes (GDP, nonagricultural population, gross values of industrial output, postal and telecommunication service scales, social commodity total volume of retail sales,resident saving balance, student sum in college), these cities are divided into four kinds of growing points, which show the different radiating function in different regions. The 12 cities, which have differed obviously in industry structure and the scale of the secondary &tertiary industry, are divided into three industry steps. By studying the difference of urban industrial function specialization in the 12 cities, the problems have been revealed in the urban industry structure developing. They are about the lower levels of the three industries, the lack of coordination with city status in the development of specialized departments, the similarity of the industry structure and the specialized departments, and so on. Based on the pattern of urban industry structure developing and the theory of regional economic step transferring, some suggestions have been discussed. They include the trends of cities'industry developing, the change and improvement of the percentage of the three industries, the adjustment and amendment of the region and industry structure, and the labor division and location of cities manufacture.
2000, 10(4): 343-347.
Abstract:
The exploitation and protection of natural and environmental resources have posed a growing challenge to cross-border regions. In this paper, a methodological study in relation to the sustainable development of cross-border regions is conducted. Our particular interest focuses on the locational characteristics of cross-border regions as well as their economic implications to the cross-border governments. Based on a sustainable development model from which the optimal outputs of different kinds of border-regions can be derived, we try to methodologically help cross-border governments to reach a final agreement of sustainable development of natural and environmental resources.It is concluded that the methods by which the net benefits among the sub-regions can be redistributed may be: 1) to equalize the absolute values of net benefit among all sub-regions concerned; and 2) to equalize the relative values of net benefit among all sub-regions concerned.
The exploitation and protection of natural and environmental resources have posed a growing challenge to cross-border regions. In this paper, a methodological study in relation to the sustainable development of cross-border regions is conducted. Our particular interest focuses on the locational characteristics of cross-border regions as well as their economic implications to the cross-border governments. Based on a sustainable development model from which the optimal outputs of different kinds of border-regions can be derived, we try to methodologically help cross-border governments to reach a final agreement of sustainable development of natural and environmental resources.It is concluded that the methods by which the net benefits among the sub-regions can be redistributed may be: 1) to equalize the absolute values of net benefit among all sub-regions concerned; and 2) to equalize the relative values of net benefit among all sub-regions concerned.
2000, 10(4): 348-355.
Abstract:
The"ring-morphostructures"(RM) are the object of this study. They are one of the most significant element of lineament's structure and unknown for the majority of investigations. RM are numerous to lineament's zone:they have different size (from 10-20km to 500-800km in diameter), structure, age, geological history and have been divided into several classes on the most important signs. They have a spatial-genetic connection Amur-Songhua-Huanghe lineament (ASHL) and had been developed simultaneously with it. The RM exerted an essential influence on the geologic-geomorphological structure, evolution and geodynamics of lineament. The main factor of evolution of lineament is a long geological process of extension of the earth's crust which is a result of the expanding earth.
The"ring-morphostructures"(RM) are the object of this study. They are one of the most significant element of lineament's structure and unknown for the majority of investigations. RM are numerous to lineament's zone:they have different size (from 10-20km to 500-800km in diameter), structure, age, geological history and have been divided into several classes on the most important signs. They have a spatial-genetic connection Amur-Songhua-Huanghe lineament (ASHL) and had been developed simultaneously with it. The RM exerted an essential influence on the geologic-geomorphological structure, evolution and geodynamics of lineament. The main factor of evolution of lineament is a long geological process of extension of the earth's crust which is a result of the expanding earth.
2000, 10(4): 356-365.
Abstract:
China is a country with a vast marine territory whose area covers one third of the total land territory area. With the exploitation of marine resources and the development of marine economy, marine economic regions have been formed gradually. We shouldn't ignore them when we divide economic regions throughout the whole nation,especially in our country. In this paper, we'll expand division principles, practice and methods of .marine comprehensive economic region. Liaoning Province,facing the Yellow Sea and the Bohai sea, is not only a part of Round-the-Bohai Sea Economic Region, but a part of national marine econemic region. Through evaluating marine resources of Liaoning, and analyzing development of marine economy, composition of marine industries and distributional characteristic of marine economy, Liaoning marine region is divided into Bohai Sea marine economic region and Yellow Sea marine economic region based on differences of marine economy. Thereby we go further into the formation of regional marine economic region and distributional mechanism of regional marine economy.
China is a country with a vast marine territory whose area covers one third of the total land territory area. With the exploitation of marine resources and the development of marine economy, marine economic regions have been formed gradually. We shouldn't ignore them when we divide economic regions throughout the whole nation,especially in our country. In this paper, we'll expand division principles, practice and methods of .marine comprehensive economic region. Liaoning Province,facing the Yellow Sea and the Bohai sea, is not only a part of Round-the-Bohai Sea Economic Region, but a part of national marine econemic region. Through evaluating marine resources of Liaoning, and analyzing development of marine economy, composition of marine industries and distributional characteristic of marine economy, Liaoning marine region is divided into Bohai Sea marine economic region and Yellow Sea marine economic region based on differences of marine economy. Thereby we go further into the formation of regional marine economic region and distributional mechanism of regional marine economy.
2000, 10(4): 366-370.
Abstract:
The lake groups in the Songnen Plain are low plain lake groups, which are located in the temperate semihumid area in China. They are characterized by small area, shallow basin, thick density and various types. In the try for classifying comprehensively the lake groups, a classification system is developed based on three main factors, i.e. forming cause, water quantity and water quality. The most internal character can be concisely grasped through three principal indexes and three auxiliary indexes of three main factors. A sample of complicated changeable path is put forward for further analyzing and outlining these basic types, in the meantime, it's linking up easily with the classification system of the single factor. According to the regional environment, the regional differences of the type composition and the principal types, the lake groups in the Songnen Plain can be divided into 6 sub-regions.
The lake groups in the Songnen Plain are low plain lake groups, which are located in the temperate semihumid area in China. They are characterized by small area, shallow basin, thick density and various types. In the try for classifying comprehensively the lake groups, a classification system is developed based on three main factors, i.e. forming cause, water quantity and water quality. The most internal character can be concisely grasped through three principal indexes and three auxiliary indexes of three main factors. A sample of complicated changeable path is put forward for further analyzing and outlining these basic types, in the meantime, it's linking up easily with the classification system of the single factor. According to the regional environment, the regional differences of the type composition and the principal types, the lake groups in the Songnen Plain can be divided into 6 sub-regions.
2000, 10(4): 371-376.
Abstract:
Assessment on wetland values is being payed more and more attention by researchers, administrators and public. This question is related to human's sustainable development in biosphere. This article analyses the commonweal values of wetlands and establishes an index system by Analytical Hierarchy Process, then assigns quantitatively the system through calculating matrix eigenvalue and characteristic vector, at last, sets up an integral way of commonweal value assessment .This paper takes Zhalong Wetland and Xianghai Wetland as study cases, the assessment results show that the both wetlands belong to the first grade importance protective wetland, which validates the method's practicability, scientific nature and rationality.
Assessment on wetland values is being payed more and more attention by researchers, administrators and public. This question is related to human's sustainable development in biosphere. This article analyses the commonweal values of wetlands and establishes an index system by Analytical Hierarchy Process, then assigns quantitatively the system through calculating matrix eigenvalue and characteristic vector, at last, sets up an integral way of commonweal value assessment .This paper takes Zhalong Wetland and Xianghai Wetland as study cases, the assessment results show that the both wetlands belong to the first grade importance protective wetland, which validates the method's practicability, scientific nature and rationality.
CHEMICAL CHARACTERISTICS OF WATER ENVIRONMENT IN LIMNIC WETLANDS IN THE WESTERN SONGNEN PLAIN, CHINA
2000, 10(4): 377-382.
Abstract:
In the western Songnen Plain in China, the alkalization degree of water bodies is high in the limnic wetlands. Generally, pH is above 8.0, and the hydrochemical types belong to HCO32--Na+ . Through analysis on the basic saline variables such as CO32-, HCO32-, Cl-, Ca2+, Mg2+, SO42-, Na+ etc. and the composed variables such as (Cl-+ SO42-）/ HCO32-and Na+ /(Ca2+ + Mg2+), the relationships between different variables were found, and the discriminant function and critical region map based on the pH value are obtained, and the function could be applied as one of the significant study methods on the investigation of saline-alkaline water-body. The relative analysis shows that the correlations are different among different salt variables, and some of them reaches significant level (α =0.01). Specially, in the western Songnen Plain, the lithofacies material of soil is mainly formed by the weathering of basalt and granite, and they are deposited inside the plain through running water transportation, so the NaAlO2, Na2SiO3 and NaHSiO3 in them can react with water and carbonate to form soda, which leads to the high correlations between Na+ and CO32-, HCO32-, Cl-, SO42-, and the correlation between Na+ and Na+ /(Ca2+ + Mg2+) is the highest. Moreover, because of high evaporation, the salts that are in the groundwater is congregated on the earth's surface, the dissoluble salts (Cl-,SO42-) turn into lake, which accounts for the reason for the high correlation between Cl-and SO42-.
In the western Songnen Plain in China, the alkalization degree of water bodies is high in the limnic wetlands. Generally, pH is above 8.0, and the hydrochemical types belong to HCO32--Na+ . Through analysis on the basic saline variables such as CO32-, HCO32-, Cl-, Ca2+, Mg2+, SO42-, Na+ etc. and the composed variables such as (Cl-+ SO42-）/ HCO32-and Na+ /(Ca2+ + Mg2+), the relationships between different variables were found, and the discriminant function and critical region map based on the pH value are obtained, and the function could be applied as one of the significant study methods on the investigation of saline-alkaline water-body. The relative analysis shows that the correlations are different among different salt variables, and some of them reaches significant level (α =0.01). Specially, in the western Songnen Plain, the lithofacies material of soil is mainly formed by the weathering of basalt and granite, and they are deposited inside the plain through running water transportation, so the NaAlO2, Na2SiO3 and NaHSiO3 in them can react with water and carbonate to form soda, which leads to the high correlations between Na+ and CO32-, HCO32-, Cl-, SO42-, and the correlation between Na+ and Na+ /(Ca2+ + Mg2+) is the highest. Moreover, because of high evaporation, the salts that are in the groundwater is congregated on the earth's surface, the dissoluble salts (Cl-,SO42-) turn into lake, which accounts for the reason for the high correlation between Cl-and SO42-.
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