Study On The Temporal And Spatial Variation Characteristics Of Ecosystem Health In Hunan Province

Ecosystem health is a necessary condition for human survival and development.With the development of regional economy and society,the ecological environment is neglected,and the relationship between regional development and ecological environment must be reconsidered.The study of ecosystem health can provide new ideas,thinking and scientific methods and ways for sustainable environmental management and ecosystem management,and ecosystem health is also the ultimate desire of environmental management.This paper systematically discusses the research progress of ecosystem health,including theoretical foundation,evaluation model and method and case evaluation.Taking Hunan province as the evaluation object,combining economic,social and natural system to construct ecosystem Health Evaluation Index System(including 28 indexes),using entropy weight method to determine each index weight,using Set pair analysis method to evaluate the health status of ecosystem in Hunan Province,and analyze its temporal and spatial change characteristics.The research results show that:(1)The characteristics of the time change of ecosystem health in Hunan Province,from 2006 to 2015,the value of the ecosystem health and the best evaluation in the city states increased from 0.116(Xiangxi)in 2006 to 0.909 in 2015(Changsha).The specific development stage is:Slowly improve stage,rapid increase stage and fluctuation rise stage,showing the trend of rising speed first slow and then rise quickly then fluctuation.(2)The characteristics of the spatial change of ecosystem health in Hunan Province are Chang-zhu-tan urban agglomeration,Yueyang and the central region of Hengyang and Changde and other cities than the western edge of Zhangjiajie,Xiangxi and other regions,Yongzhou,Loudi,Yiyang,Huaihua and other areas of the ecosystem health status in the middle level.The close degree of the health status and the optimal evaluation set of the ecosystem in Hunan Province shows the distribution pattern which is higher than the west in the east and gradually tilted from east to west.(3)The temporal and spatial characteristics of ecosystem health coordination degree in Hunan Province are generally the change trend in time from low to High,2008 to 2009 was the best,and gradually decreased from the high.Spatial distribution and the spatial distribution of each subsystem are different and changing,from the same spatial distribution of economic subsystem to the spatial distribution of economic subsystem.