Urban green land was the important component of urban ecological system and occupied a decisive position in ameliorating urban ecological environment. By using GIS, the author analyzed the image data of Quick Bird sat...Urban green land was the important component of urban ecological system and occupied a decisive position in ameliorating urban ecological environment. By using GIS, the author analyzed the image data of Quick Bird satellite, interpreted remote sensing images, and extracted patch space attribute information of urban green land. The author also obtained highly-precise attribute information and map of urban green space of Jinghong City, through establishing and compiling of geographic data, drawing of maps and measuring of area. And the survey on garden plants' species, quantity, distribution, growth and establishment of artificial plants community had been carried out, so as to analyze the basic characteristics of urban green land in Jinghong City. It could be known from the survey result that each green land index had reached state standard for garden city. It could be concluded that the characteristics of urban green land in Jinghong City were:diversified urban green land types, unique character of park green land, remarkable maintenance effect of green land, rich garden plants species, garden plants with distinguish national culture and widespread application of native plants.展开更多
With the acceleration of urbanization,urban development poses a growing demand for land.China's national conditions of a large population with relatively little arable land require us to intensively use land,and m...With the acceleration of urbanization,urban development poses a growing demand for land.China's national conditions of a large population with relatively little arable land require us to intensively use land,and more and more departments have been aware of the importance of intensive urban land use.The study on the current land use in the urban area of Ma'anshan City,is not only conducive to adjustment of land use layout and structure as well as urban ecological construction,but also of guiding significance to the economical and intensive land use in Ma'anshan City.This paper first describes the natural,social and economic situation of Ma'anshan's urban area,then analyzes the land use structure,layout and problems,and finally puts forth the recommendations for improving current land use situation in the urban area of Ma'anshan City.展开更多
Human induced land degradation refers to decline or loss of biological or economic productivity resulting from a process or combination of processes, including displacement of soil matreial, terrain deformation and l...Human induced land degradation refers to decline or loss of biological or economic productivity resulting from a process or combination of processes, including displacement of soil matreial, terrain deformation and loss of nutrients and/or orgnic matter through wind erosion, water erosion, secondary salinization and pollution. Wind erosion is a major problem in the dry land of China and the area of sandy desertified land caused by wind erosion has reached 371,000 km 2. Water erosion frequently occurs in hilly and mountainous areas where 1.79 million km 2 of land have been observed and degraded land area affected by secondary salinization now covers 63,000 km 2 in China. Statistical data indicated that depletion of soil nutriution is a serious problem in China. Some 460,000 km 2 of cultivated or 46 percent of the total cultivated land area is deficient in P, and 330,000 km 2 of cultivated land or one-third of nation′s total is deficient in K. Adverse human activities are recognized as a principal reason of land degradation. In northern China, 30.1 percent of land degradation caused by over grazing, 26.9 percent by over reclamation, 33.7 percent by excessive fuel collection, 9.6 percent by mis-use of water resources, as well as 0.7 percent by industrial, mining and transportation construction. In southern China, 37 percent of degraded land caused by deforestation, 35 percent by slopeland reclamation, 18 percent by improper afforestation, and 10 percent by industrial, mining and transportation construction. Following the discussion of the causes and disasters of land degradation, this paper presents the achievements gained in prevention and control of land degradation since 1949. The several control strategic measures in combating land degradation such as prompting public awareness and people's participation, strengthening national laws and policies formulation, carrying out projects on rehabilization and monitoring, are proposed by the end of this paper.展开更多
This paper is aimed to analyze the current situation and problems about land use of various karst environments via field survey,documentation and comparison methods,and to make reasonable recommendations about land us...This paper is aimed to analyze the current situation and problems about land use of various karst environments via field survey,documentation and comparison methods,and to make reasonable recommendations about land use and management for different karst types in a bid to provide theoretical and practical basis for optimization of karst land use and the comprehensive control of karst rock desertification.The results show that,①as the bare karst areas are lack of water and soil and highly vulnerable to droughts and floods,land utilization in such areas should follow the principles of soil and water conservation and ecological restoration,emphasize both the ecological benefit and the economic benefits and reasonably configure the land resources to achieve virtuous circle;②in covered karst areas,the most important task is to take measures to prevent the appearance of secondary karst rock desertification,water exhaustion and karst collapse;③the buried karst areas shall mainly focus on prevention of overlaying sand shale collapse,and possible pollution of deep karst water and the surface land resulted from exploration and exploitation of oil and gas and geothermal water.④The final conclusion is that features and problems of land utilization of the three karst types are different from each other,and that the general principle for land use in karst regions shall be based on the local conditions.展开更多
基金Supported by Key Discipline Project of State Forestry Bureau(23002802)Key Discipline Project of Yunnan Province(500017)+1 种基金Financing Project of Key Laboratory in College of Yunnan Province(057)Funds of People's Government of Jinghong City~~
文摘Urban green land was the important component of urban ecological system and occupied a decisive position in ameliorating urban ecological environment. By using GIS, the author analyzed the image data of Quick Bird satellite, interpreted remote sensing images, and extracted patch space attribute information of urban green land. The author also obtained highly-precise attribute information and map of urban green space of Jinghong City, through establishing and compiling of geographic data, drawing of maps and measuring of area. And the survey on garden plants' species, quantity, distribution, growth and establishment of artificial plants community had been carried out, so as to analyze the basic characteristics of urban green land in Jinghong City. It could be known from the survey result that each green land index had reached state standard for garden city. It could be concluded that the characteristics of urban green land in Jinghong City were:diversified urban green land types, unique character of park green land, remarkable maintenance effect of green land, rich garden plants species, garden plants with distinguish national culture and widespread application of native plants.
基金Supported by Fund Project of Ma'anshan Municipal Bureau of Land and Resources
文摘With the acceleration of urbanization,urban development poses a growing demand for land.China's national conditions of a large population with relatively little arable land require us to intensively use land,and more and more departments have been aware of the importance of intensive urban land use.The study on the current land use in the urban area of Ma'anshan City,is not only conducive to adjustment of land use layout and structure as well as urban ecological construction,but also of guiding significance to the economical and intensive land use in Ma'anshan City.This paper first describes the natural,social and economic situation of Ma'anshan's urban area,then analyzes the land use structure,layout and problems,and finally puts forth the recommendations for improving current land use situation in the urban area of Ma'anshan City.
文摘Human induced land degradation refers to decline or loss of biological or economic productivity resulting from a process or combination of processes, including displacement of soil matreial, terrain deformation and loss of nutrients and/or orgnic matter through wind erosion, water erosion, secondary salinization and pollution. Wind erosion is a major problem in the dry land of China and the area of sandy desertified land caused by wind erosion has reached 371,000 km 2. Water erosion frequently occurs in hilly and mountainous areas where 1.79 million km 2 of land have been observed and degraded land area affected by secondary salinization now covers 63,000 km 2 in China. Statistical data indicated that depletion of soil nutriution is a serious problem in China. Some 460,000 km 2 of cultivated or 46 percent of the total cultivated land area is deficient in P, and 330,000 km 2 of cultivated land or one-third of nation′s total is deficient in K. Adverse human activities are recognized as a principal reason of land degradation. In northern China, 30.1 percent of land degradation caused by over grazing, 26.9 percent by over reclamation, 33.7 percent by excessive fuel collection, 9.6 percent by mis-use of water resources, as well as 0.7 percent by industrial, mining and transportation construction. In southern China, 37 percent of degraded land caused by deforestation, 35 percent by slopeland reclamation, 18 percent by improper afforestation, and 10 percent by industrial, mining and transportation construction. Following the discussion of the causes and disasters of land degradation, this paper presents the achievements gained in prevention and control of land degradation since 1949. The several control strategic measures in combating land degradation such as prompting public awareness and people's participation, strengthening national laws and policies formulation, carrying out projects on rehabilization and monitoring, are proposed by the end of this paper.
基金Supported by the Fundamental Research Funds for the Central Universities(XDJK2011C048)
文摘This paper is aimed to analyze the current situation and problems about land use of various karst environments via field survey,documentation and comparison methods,and to make reasonable recommendations about land use and management for different karst types in a bid to provide theoretical and practical basis for optimization of karst land use and the comprehensive control of karst rock desertification.The results show that,①as the bare karst areas are lack of water and soil and highly vulnerable to droughts and floods,land utilization in such areas should follow the principles of soil and water conservation and ecological restoration,emphasize both the ecological benefit and the economic benefits and reasonably configure the land resources to achieve virtuous circle;②in covered karst areas,the most important task is to take measures to prevent the appearance of secondary karst rock desertification,water exhaustion and karst collapse;③the buried karst areas shall mainly focus on prevention of overlaying sand shale collapse,and possible pollution of deep karst water and the surface land resulted from exploration and exploitation of oil and gas and geothermal water.④The final conclusion is that features and problems of land utilization of the three karst types are different from each other,and that the general principle for land use in karst regions shall be based on the local conditions.
