Impacts of vegetation restoration on soil erosion in the Yellow River Basin, China

Soil erosion is a serious and complex environmental problem, which directly leads to soil degradation and reduces land productivity. Analyzing the effect of vegetation restoration on soil erosion is the main way to quantitatively evaluate the contribution of vegetation restoration to soil erosion in semi-arid. This study utilized the RUSLE model and Geodetector method to quantitatively characterize the spatio-temporal dynamics of soil erosion and the contribution of FVC to erosion mitigation in the Yellow River Basin (YRB) since the implementation of the Grain for Green Project (GGP). The main findings are concluded as follows: (1) The fractional vegetation cover (FVC) in the YRB showed an overall increasing trend, with an average annual change rate of 0.006 a-1. (2) Soil erosion in YRB increased from 1999 to 2010, with a 10% increase in soil erosion intensity, and from 2010 to 2018, soil erosion improved significantly with a 31% decrease in soil erosion. The severe erosion areas were mainly concentrated in the Loess Plateau (LP) and the source area of the Yellow River (YR), which generally showed northeast-southwest banding changes. (3) FVC has a relatively stronger explanatory power for soil erosion in the YRB. FVC explained 5% of soil erosion, but the combination of FVC and land use, as well as the combination of FVC and slope, collectively explained 47% of soil erosion. The ecology of the YRB greatly benefits from the implementation of the GGP and other water conservation projects. But there are still necessities to formulate targeted soil and water conservation measures base on careful investigation of local conditions.