Spatio-temporal Evolution and Driving Factors of Soil Conservation Function in Qinghai Lake Basin Based on In VEST Model
Taking Qinghai Lake Basin as the study area,we explored the spatial and temporal characteristics of soil conservation services and the attribution of spatial heterogeneity to provide reference for the ecological protection and sustainable development.Based on eight periods of land use data from 1985 to 2020,combined with topographic,soil and meteorological data,the InVEST model and geoprobe method were used to simulate soil conservation services,to assess the amount of soil conservation and its value,and to attribute its spatial heterogeneity.The results showed that:(1)The change interval of soil conservation in Qinghai Lake Basin was 3.36×108t～11.73×108t,showing a trend of decreasing,then increasing and then decreasing;soil conservation was high in the northwest and low in the southeast.(2)Among different land use types,grassland had the largest soil conservation intensity and a total amount of soil conservation;soil conservation intensity increased with the increase of elevation and slope.(3)The average annual soil conservation service value of the watershed was 6.12×1010yuan,dominated by the value of maintaining soil fertility E1.(4)The single-factor results of geodetection showed that soil type and elevation had the most significant explanatory power;the degree of influence of spatial heterogeneity of soil conservation services was jointly determined by multiple factors.The overall explanatory power was highest in the interaction between vegetation cover and soil type,while elevation and soil type jointly acted on vegetation cover,which was the dominant factor influencing the spatial heterogeneity of soil conservation services.The vegetation cover factor played an irreplaceable role in the spatial heterogeneity of soil conservation services,and the corresponding soil and water conservation measures should be taken to improve the vegetation cover,to reduce soil erosion,to increase the soil conservation capacity,and to improve the ecological environment.
InVEST modelgeographic detectorsoil conservation servicesQinghai lake basin
NETL
NSTL
万方数据
