基于InVEST模型的碧流河流域土壤保持功能研究

以辽宁省碧流河流域为研究区,基于土壤可蚀性因子,降雨侵蚀力因子,地形因子,植被覆盖因子,保护措施因子,利用InVEST模型计算出碧流河流域的潜在土壤侵蚀量、实际土壤侵蚀量和土壤保持量,分别为12968.8万t、390.9万t和1016.3万t。空间上的土壤侵蚀量呈现出由北向南递减,由流域两侧向中部干流递减的趋势,土壤保持量流域的东部要优于西部。不同土地利用类型的土壤保持能力有着较大差异,保持能力的排序为:林地>草地>耕地>建筑用地>未利用土地>水域。

Study on soil conservation function of Biliu River based on the InVEST model

Based on soil erodibility factor,rainfall erosivity factor,topographic factor,vegetation coverage factor and protection measure factor,this paper takes the Biliu River Basin in Liaoning Province as the research area,uses the InVEST model to calculate the potential soil erosion and actuality in the Biliu River Basin.The amount of potential soil erosion actual soil erosion,and soil conservation were 192.888 million tons,3.909 million tons and 10.163 million tons,respectively.The amount of soil erosion in space shows a downward trend from north to south,and the trend from the two sides of the basin to the central stream is decreasing.The eastern part of the soil conservation volume is better than the west.The soil retention capacity of different land use types is quite different.The order of conservation capacity is:forest land>grassland>cultivated land>construction land>unused land>water area.