"三北"工程区土壤保持服务的时空格局变化及其植被响应机制OA

Quantitative assessment of the spatio-temporal characteristics of soil conservation service and their vegetation response provides decision-making references for the precise implementation and sustain-able management of ecological restoration projects in the Three-North Shelter Forest Program.Based on multi-source data including land use,precipitation,soil,and vegetation from 2000 to 2023,this study com-prehensively utilized the InVEST model,standard deviation ellipse,and bivariate spatial autocorrelation methods to systematically analyze the spatio-temporal evolution patterns of soil conservation services in the Three-North Shelter Forest Program and their response relationships with vegetation.The results show that:1)Soil conservation services in the Three-North Shelter Forest Program from 2000 to 2023 exhibited an inverted"U"-shaped trend,first increasing and then decreasing,with an overall increase of 14.21%.The area of low-level soil conservation service zones continuously decreased,and the overall soil conservation function in the region showed a favorable development trend.2)The spatial distribution of soil conserva-tion services in the Three-North Shelter Forest Program remained relatively stable during the study peri-od.The change characteristics were mainly characterized by"increase(42.23%),no change(37.26%),and decrease(20.51%)".Low-value areas were distributed in contiguous patches in the Three-North Shelter Forest Program,while high-value areas presented a"point-block"distribution pattern,mainly concentrated in five typical regions of the Three-North Shelter Forest Program.3)The spatial distribution of soil con-servation services maintained a stable northeast-southwest orientation,and the degree of spatial agglomera-tion continuously increased.The trajectory of the center of gravity migration showed a trend of moving from west to east,indicating that the improvement speed of soil conservation service capacity in the eastern region was significantly faster than that in the western region.4)Soil conservation services were signifi-cantly spatially positively correlated with vegetation coverage and leaf area index.The spatial association pattern showed obvious regional differentiation,with low-low clusters concentrated in contiguous patches in the central and western regions of the Three-North Shelter Forest Program,while high-high clusters presented a distinct"edge distribution"feature.