Based on the remote sensing images of urban land use of Chongqing City Proper in the last 30years(from 1978 to 2011),The paper focuses on the impact of urban spatial expansion on urban ecosystem service.The charactere...Based on the remote sensing images of urban land use of Chongqing City Proper in the last 30years(from 1978 to 2011),The paper focuses on the impact of urban spatial expansion on urban ecosystem service.The charactereristics of urban spatial expansion pattern are expressed by Landscape Expansion Index and Index of Fractal Dimension.Taking advantage of calculation of these two indices,changes of the ecological service values in the main urban area of Chongqing caused by the variation of urban expansion patterns are evaluated and the interrelationship is analyzed.The main conclusions and results are as follows;in Chongqing City Proper,the ecological service value decreased rapidly from 1978 to 2011,especially in the period of 2002-2011.Urban spatial expansion pattern has exerted significant impact on urban ecosystem service value.Edge-expansion pattern broke into a great deal of urban enclaves and caused the disadvantage effect of the function of urban ecological system.At the same time,negative correlation existed between the indices of fractal dimension and the ecosystem service value.展开更多
Central Asia features an arid and semi-arid climate,and the region is undergoing urbanization in the context of a fragile eco-environment.The influence of specific historical events in this region also persists on thi...Central Asia features an arid and semi-arid climate,and the region is undergoing urbanization in the context of a fragile eco-environment.The influence of specific historical events in this region also persists on this ongoing urbanization.This study examines the mechanism of interaction between urbanization and the resource environment in Central Asia.The following results were obtained.(1)In different periods-Russian colonization,the era of the Soviet Union,and Central Asian countries as independent-the interactions between urbanization and the resource environment varied.(2)Variations in land use within 50 km of major cities of the region reflect both the trend of urbanization and that of variations in the eco-environment.In Kyrgyzstan and Tajikistan,where urbanization has been slow,the supportive effect of the eco-environment for urbanization was clear.In Uzbekistan and Turkmenistan,where freshwater resources are scarce,a close relationship was noted between urbanization and variations in the eco-environment.In Kazakhstan,fast urbanization has had a significant impact on the availability of water,grassland,and woodland in the relevant areas.(3)The efficiency of utilization of land and water resources is generally low.The compactness of the urban land of 47 major cities in Central Asia decreased from 0.44 in 1990 to 0.31 in 2015.Of them,31 cities decreased in compactness,including all national capitals.Regardless of the level of urbanization,water consumption was high across the region.(4)The mechanisms of interaction between urbanization and the resource environment in Central Asia in the three stages were formulated to illustrate their specific temporal conductivity and spatial relevance.展开更多
基金Supported by the Key Technologies R&D Program(No.2012 BAJ23B05)the National Natural Science Foundation of China(No.40701179)
文摘Based on the remote sensing images of urban land use of Chongqing City Proper in the last 30years(from 1978 to 2011),The paper focuses on the impact of urban spatial expansion on urban ecosystem service.The charactereristics of urban spatial expansion pattern are expressed by Landscape Expansion Index and Index of Fractal Dimension.Taking advantage of calculation of these two indices,changes of the ecological service values in the main urban area of Chongqing caused by the variation of urban expansion patterns are evaluated and the interrelationship is analyzed.The main conclusions and results are as follows;in Chongqing City Proper,the ecological service value decreased rapidly from 1978 to 2011,especially in the period of 2002-2011.Urban spatial expansion pattern has exerted significant impact on urban ecosystem service value.Edge-expansion pattern broke into a great deal of urban enclaves and caused the disadvantage effect of the function of urban ecological system.At the same time,negative correlation existed between the indices of fractal dimension and the ecosystem service value.
基金The Strategic Priority Research Program of Chinese Academy of Sciences,No.XDA20040402,No.XDA20030101。
文摘Central Asia features an arid and semi-arid climate,and the region is undergoing urbanization in the context of a fragile eco-environment.The influence of specific historical events in this region also persists on this ongoing urbanization.This study examines the mechanism of interaction between urbanization and the resource environment in Central Asia.The following results were obtained.(1)In different periods-Russian colonization,the era of the Soviet Union,and Central Asian countries as independent-the interactions between urbanization and the resource environment varied.(2)Variations in land use within 50 km of major cities of the region reflect both the trend of urbanization and that of variations in the eco-environment.In Kyrgyzstan and Tajikistan,where urbanization has been slow,the supportive effect of the eco-environment for urbanization was clear.In Uzbekistan and Turkmenistan,where freshwater resources are scarce,a close relationship was noted between urbanization and variations in the eco-environment.In Kazakhstan,fast urbanization has had a significant impact on the availability of water,grassland,and woodland in the relevant areas.(3)The efficiency of utilization of land and water resources is generally low.The compactness of the urban land of 47 major cities in Central Asia decreased from 0.44 in 1990 to 0.31 in 2015.Of them,31 cities decreased in compactness,including all national capitals.Regardless of the level of urbanization,water consumption was high across the region.(4)The mechanisms of interaction between urbanization and the resource environment in Central Asia in the three stages were formulated to illustrate their specific temporal conductivity and spatial relevance.
