基于InVEST模型的金塔县土壤侵蚀和土壤保持状况评价

Research on soil erosion and soil conservation status in Jinta County based on InVEST model

摘要:

基于 InVEST 模型定量评价了 2019 年金塔县土壤侵蚀与土壤保持量，分析了金塔县的土壤侵蚀与土壤保持在空间上的分布情况，以及不同土地利用类型和坡度对土壤侵蚀以及土壤保持量的影响。结果表明，金塔县 2019 年土壤侵蚀总量和土壤保持总量分别为 1. 91×10⁷ t 和 2. 70×10⁶ t，土壤侵蚀强度较大的区域主要集中在鼎新镇以及航天镇的巴丹吉林沙漠边缘沙化较严重区域，土壤保持能力较强的区域主要集中在鼎新镇西部草地覆盖面积较大的区域，且土壤侵蚀量随坡度增大而增加。从土地利用类型来看，草地的土壤保持能力最好，以裸岩石砾地为主的未利用地土壤侵蚀量远大于其他土地利用类型。

Abstract:

Soil erosion and soil conservation in Jinta County in 2019 were quantitatively evaluated based on the InVEST model. The spatial distribution of soil erosion and soil conservation in Jinta County was analyzed. And the effects of different land use types and slopes on soil erosion as well as soil conservation were examined. The results showed that the total soil erosion and soil conservation in Jinta County in 2019 were 1. 91×10⁷ t and 2. 70×10⁶ t，re‐ spectively. The areas with high soil erosion intensity were mainly concentrated in Dingxin town and in Hangtian Town which was in the Badain Jaran Desert edge areas with serious desertification. The areas with strong soil conser‐ vation ability were mainly concentrated in the areas with large grassland coverage in the west of Dingxin Town. The soil erosion increased with the increase of slope. From the perspective of land use types，grassland had the best soil conservation ability，and the soil erosion of unused land dominated by bare rock and gravel land was much greater than that of other land use types.