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Impact of Forest Restoration on Reducing Soil and Water Loss in a Bare Catchment of the Purple Soil Region, Southwestern China
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Impact of Forest Restoration on Reducing Soil and Water Loss in a Bare Catchment of the Purple Soil Region, Southwestern China
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Impact of Forest Restoration on Reducing Soil and Water Loss in a Bare Catchment of the Purple Soil Region, Southwestern China
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Journal Article
Impact of Forest Restoration on Reducing Soil and Water Loss in a Bare Catchment of the Purple Soil Region, Southwestern China
2026
Overview
Soil erosion in the purple soil region presents severe challenges with complex driving mechanisms. At the same time, evaluation and prediction of runoff and sediment dynamics are lacking for natural vegetation restoration in bare areas. The Mann–Kendall and Pettitt tests were employed to identify abrupt shift points in runoff and sediment dynamics, utilizing monitoring data from the Suining Soil and Water Conservation Experimental Station over the period from 1984 to 2018. Therefore, the research periods were divided into a baseline period (1984–1992) and an evaluation period (1993–2018). Subsequently, encompassing rainfall, runoff, sediment, topography, soil properties, and vegetation parameters, a Water Erosion Prediction Project (WEPP) model was established to quantify the reduction benefits of runoff and sediment during the period of forest restoration. We found that the calibrated WEPP model demonstrated satisfactory performance based on Nash–Sutcliffe efficiency coefficients (NSE > 0.5) and determination coefficients (R2 > 0.5) for runoff and sediment simulations. The WEPP model and double-mass curve analysis method revealed that forest restoration reduced runoff and sediment by more than 80%. It is recommended to implement artificial vegetation restoration before reaching the threshold for natural vegetation restoration to achieve soil and water conservation goals.
