流域景观格局对土壤保持服务的影响

以子流域为空间单元，应用生态系统服务和交易的综合评估模型（InVEST）进行土壤保持服务评估，并借助景观指数计算软件（FRAGSTATS）表征景观格局特征，综合运用空间自相关探讨土壤保持量与景观格局指数的空间关联关系，同时从景观格局角度出发，开展土壤保持量与景观格局指数的空间回归分析.结果表明：2014年土壤保持服务较高的子流域具有景观类型组成相对单一、景观各类型间非均匀分布、存在优势斑块、景观分离度低的格局特征； 2014年甘肃白龙江14个子流域表现出土壤保持服务与景观格局显著的空间相关关系，占子流域总数量的37.84%；模型对比方面，空间滞后模型（SLM）优于非空间线性模型（OLS），表明甘肃白龙江各子流域的土壤保持量在空间上具有实质性的空间依赖.景观类型多样性及其均匀程度是影响甘肃白龙江子流域土壤保持量的重要景观指标.

Influence of watershed landscape pattern on soil conservation service

Based on the sub-watershed unit, landscape pattern and soil conservation service was quantitatively characterized via landscape pattern index and InVEST model, and the relationship between the two issues was also discussed from the perspectives of spatial statistics. The results showed that the sub-watersheds with higher soil conservation services in 2014 had the characteristics of single landscape types composition, non-uniform distribution among different landscape types, existence of dominant patches, and low landscape separation degree. In 2014, the significant spatial correlations between soil conservation services and landscape pattern was mainly in 14 sub-watersheds,which accounted for 37.84% of the total number of sub-watersheds. In the model selection, spatial lag model (SLM) was superior to the non-spatial linear model (OLS), which indicated that soil conservation was spatially dependent. Diversity and evenness of landscape types were considered as important indicators affecting soil conservation in the Bailongjiang watershed in Gansu Province.