Response Analysis Of Construction Land Expansion And Eco-environmental Quality Change In Ganzhou District

The most direct manifestation of rapid urbanization is the swift expansion of urban space,which is done by squeezing the surrounding agricultural and ecological space.Scientific organization of territory development planning is crucial to solving the contradiction between urban space,agricultural space and ecological space,promoting the ecological civilization and building a beautiful China.Therefore,it is of great significance to clarify the relationship between the expansion of construction land and the change of ecological environment quality for territory development planning and regional sustainable development.Based on Landsat remote sensing images of Ganzhou District from 1991 to 2020,we first analyze the expansion of construction land and the change of ecological environment quality in Ganzhou District from time and space.Then we combine two dimensions and do a response analysis on the scale of construction land and ecological environment quality from three dimensions（urban,oasis and global scale）.We further explore the impact of the expansion area,expansion mode and expansion occupation of construction land on the ecological environment.The relationship between the expansion of construction land and the change in ecological environment quality has been clarified.The suggestions for the organization of territory development planning in Ganzhou District have been proposed based on the goals of improving and protecting the ecological environment.Finally,we get four main conclusions from the following aspects:（1）The response between the scale of construction land and the quality of the ecological environment.At the urban scale,there is a strong negative correlation between the scale of construction land and the quality of the ecological environment.At the oasis scale,the correlation between the two indicators gradually changes from weak positive to weak negative correlation.The two indicators show a weak positive correlation on the global scale,and the correlation gradually diminishes.（2）The impact of construction land expansion on ecological environment quality.The expansion of urban construction land leads to the apparent decrease in urban ecological environment quality.It has no evident impact on the change of ecological environment quality at the oasis and global scale.The expansion of oasis construction land leads to decreased oasis ecological environment quality,and it has no evident impact on the change of ecological environment quality on a global scale.The expansion of construction land on a global scale has no evident impact on the change of ecological environment quality on a global scale.（3）At the urban scale,the enclave or marginal expansion of construction land and the occupation of cultivated land have resulted in a significant decrease in ecological environment quality.The filling expansion of construction land and the development of unused land have improved ecological environment quality to a certain extent.（4）At the global scale,the enclave expansion of construction land and the development of unused land have no significant impacts on ecological environment quality unchanged or slightly improved.The marginal expansion of construction land and the occupation of cultivated land or forest and grassland have resulted in the degradation of ecological environment quality.