Temporal And Spatial Correlation Analysis Between Ecosystem Services And Human Activity Intensity In Dongting Lake Ecological Economic Zone

Dongting Lake is the second largest freshwater lake in China.The stability of ecosystem services in Dongting Lake eco-economic zone is very important to the ecological security of the Yangtze River Basin.In recent 30 years,with the rapid growth of population and the continuous acceleration of urbanization,the problems of ecological function degradation and resource constraint in Dongting Lake ecological economic zone have become increasingly apparent.Based on the data of land use status in 1990,2000,2010 and2018,this study analyzed land use change and used the human activity intensity assessment model to measure the value of human activity intensity.By In VEST model to assess the dongting lake ecological economic zone water conservation,soil conservation,carbon storage and maintenance of biological diversity four ecosystem services,and weighted comprehensive ecosystem services value,human activity intensity by Geo DA software and integrated ecosystem services bivariate spatial autocorrelation analysis,In order to provide reference for regional ecological sustainable and coordinated development of man-land.The main conclusions can be drawn as follows:(1)Arable land and forest land are the most in the study area;During the period,construction land increased significantly,while forest land,arable land,grassland and wetland decreased.The intensity of human activities increased year by year,and showed a spatial pattern of "high in the middle,low around".(2)Water conservation and soil conservation were significantly affected by annual precipitation,and showed a fluctuating trend of decreasing at first,increasing and decreasing again.Carbon storage,habitat quality and integrated ecosystem services showed a decreasing trend year by year,which were mainly affected by unreasonable human activities such as lake reclamation and deforestation.All ecosystem services and integrated ecosystem services showed a spatial pattern of "higher in the east and lower in the middle",which was mainly related to the greater distribution of forest land in the east and west of the study area.(3)Moran’s I was-0.503,-0.495,-0.538 and-0.526,respectively,showing a significant negative correlation between human activity intensity and integrated ecosystem services.In terms of clustering types,high-low clustering and low-high clustering are the main ones.The high-low cluster was mainly distributed in the central region,while the low-high cluster was mainly distributed in the northwest,southwest and southeast.The results showed that with the increasing intensity of human activities,the ecosystem services were weakened.(4)In view of different cluster types and existing problems,suggestions were put forward to optimize land use structure,rationally plan human activities,control soil and water loss,carry out ecological source and ecological corridor construction,and improve people’s awareness of ecological protection.