Assessment of ecological environment in arid region based on the improved remote sensing ecological index:A case study of Wuchuan County,Inner Mongolia at the northern foot of Yin Mountains
Real-time assessment of ecological environment quality in arid and semi-arid regions is crucial for the sustainable development of ecological environments in China.In this study,we constructed a topsoil remote sensing ecological index(TRSEI)by coupling five indicators,greenness,wetness,dryness,topsoil grain size,and heat,with the Google Earth Engine(GEE).With the index,we evaluated the ecological environment quality of Wuchuan County from 1990 to 2020,and examined the spatio-temporal variations of ecological environment quality and its driving factors by using univariate linear regression,multiple regression residual analysis,and Hurst index.Results showed that the first principal component of the TRSEI in the study area contributed over 70％ ,with a mean eigen-value of 0.148,indicating the effective integration of various ecological indicators by TRSEI.The topsoil grain size index was essential for the assessment of ecological environment quality in arid and semi-arid regions.From 1990 to 2020,the fluctuation range of TRSEI in the study area was between 0.289 and 0.458,showing an overall slight de-terioration trend.The ecological environment quality of cropland and de-farming region had improved,with the im-proved area accounting for 47.9％ of the total area.The grassland,barren land,and construction land areas had de-teriorated,with the deteriorated area accounting for 52.1％ of the total area.In the future,36.9％ of the regions would experience continuous improvement in ecological environment quality,while 41.4％ might continue to dete-riorate.Human activities were the primary driving factor for the changes in ecological environment quality in arid and semi-arid regions,accounting for 88.6％ of the total area.Climate change also had a significant impact,ac-counting for 11.4％ of the total area.The TRSEI could effectively assess the ecological environment quality of arid and semi-arid regions,providing a scientific basis for ecological conservation and construction in these areas.
arid and semi-arid regionecological environment qualitytopsoil remote sensing ecological indexGoogle Earth Engine(GEE)Wuchuan County
万方数据
维普
