RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2021, Vol. 30 >> Issue (3): 654-666.doi: 10.11870/cjlyzyyhj202103013

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Spatiotemporal Change and Correlation Analysis of Ecosystem Service Values and Ecological Risk in Three Gorges Reservoir Area in the Past 30 Years

LI Hui 1,2,ZHOU Qi-gang 1,LI Bin 3 ,GUO Hong-lei 4 ,WANG Fu-hai 1,2,HE Chang-hua 1,2   

  1. (1.Chongqing Key Laboratory of Spatial Information Data Mining and Big Data Integration of Ecological Environment,Chongqing 401320,China;
    2.Chongqing Finence and Economics College,Chongqing 401320,China;3.Public Administration School of Chongqing Technology
     and Business University, Chongqing 400067, China;4.Key Laboratory of Virtual Geographic Environment
    (Nanjing Normal University),Ministry of Education,Nanjing 210023,China)
  • Online:2021-03-20 Published:2021-04-07

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Abstract: A large number of ecological land use has been transformed to non-ecological land use, and the key ecological conservation sources in the regional landscape pattern have been shrinking, and the function of ecological services has been weakening, which makes ecological security face new challenges.With the agglomeration of spatial elements and the rapid development of economy.This paper calculates the spatial and temporal differentiation characteristics of ecosystem service value and ecological risk index in the Three Gorges Reservoir area in the past 30 years and their correlation,based on the Landsat TM/Landsat 8OLI images of the Three Gorges Reservoir area in 1986, 1995, 2000, 2007, 2010 and 2018, and based on the 5 km*5 km evaluation cell.The results show that:(1)The total value of ecosystem services in the Three Gorges Reservoir area continued to increase from 1 639.56*108 yuan to 1 662.01*108 yuan, with an overall increase of 1.37%.The proportion of high-level ecological risk levels showed a slow decreasing trend, with an overall decline of 10.89%, and the ecological situation of the study area improved from 1986 to 2018;(2)There is a certain negative correlation between ecosystem service value and ecological risk index per unit area in the Three Gorges Reservoir Area, and there is also a certain negative correlation in space;(3)The value of ecosystem services and ecological risk index are not synchronized in the change rate.The value of ecosystem services corresponding to the high-risk index region has a greater possibility of reduction, which needs special attention.The purpose of the study is to provide reference for the safe operation of the Three Gorges Project and the sustainable development and utilization of the Three Gorges Reservoir Area.

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