Analysis of spatio-temporal heterogeneity of ecological environment quality in Xianyou County based on GEE
Based on the Google Earth Engine platform,a remote sensing ecological index(RSEI)was constructed to evalu-ate the ecological environment status of Xianyou County in Fujian Province from 2000 to 2020.And the RSEI in 2000,2010,and 2020 were first classified into five levels:poor,fair,moderate,good,and excellent.The RSEI for 20 years was also divided into two research stages:2000-2010 and 2010-2020 for difference detection,to explore the spatio-temporal distribution characteristics of ecological environment quality.Then the spatial distribution pattern and clustering pattern of RSEI were revealed using spatial autocorrelation analysis tools.Finally,land use data was combined to analyze the impact of land use changes on ecological environment quality.The results showed that the overall RSEI of Xianyou County in 2000,2010,and 2020 were mainly at good and excellent grades,accounting for 76.09％,73.70％,and 89.94％,respectively.They were mainly distributed in the northern region,while poor and fair grades were distributed in the central and southern regions.In both research periods,the improved area was greater than the degraded area,indicating the ecological environ-ment quality gradually improving.The spatial distribution of RSEI was mainly characterized by high-high clustering and low-low clustering.High-high clustering was mainly distributed in the northwest direction,while low-low clustering was mainly distributed near the Mulan River basin.From 2000 to 2010,the proportion of land converted from construction land to other land types was the highest at 27.21％,while the proportion of land converted from forest land to other land types was the lowest at 3.41％;From 2010 to 2020,the area transformation from water bodies to other land types accounted for the high-est proportion at 69.64％,while the area from forest land to other land types accounted for the lowest proportion at 7.85％.During the conversion process,the ecological environment quality of cultivated land and forest land has been greatly im-proved,and the proportion of degradation from cultivated land to construction land was 5.53％and 6.78％,respectively,as the most obvious type of ecological grade degradation.
RSEIEcological environmentSpatio-temporal distributionSpatial autocorrelationXianyou County
NETL
NSTL
万方数据
