Modelling and mapping soil erosion potential in China

TENG Hong-fen; HU Jie; ZHOU Yue; ZHOU Lian-qing; SHI Zhou

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Modelling and mapping soil erosion potential in China

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Soil erosion is an important environmental threat in China. However, quantitative estimates of soil erosion in China have rarely been reported in the literature. In this study, soil loss potential in China was estimated by integrating satellite images, field samples, and ground observations based on the Revised Universal Soil Loss Equation (RUSLE). The rainfall erosivity factor was estimated from merged rainfall data using Collocated CoKriging (ColCOK) and downscaled by geographically weighted regression (GWR). The Random Forest (RF) regression approach was used as a tool for understanding and predicting the relationship between the soil erodibility factor and a set of environment factors. Our results show that the average erosion rate in China is 1.44 t ha-1 yr-1. More than 60% of the territory in China is influenced by soil erosion limitedly, with an average potential erosion rate less than 0.1 t ha-1 yr-1. Other unused land and other forested woodlands showed the highest erosion risk. Our estimates are comparable to those of runoff plot studies. Our results provide a useful tool for soil loss assessments and ecological environment protections.

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《农业科学学报（英文版）》 |2019年第2期|251-264|共14页
作者
TENG Hong-fen; HU Jie; ZHOU Yue; ZHOU Lian-qing; SHI Zhou;
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作者单位

College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R.China;

State Key Laboratory of Soil and Sustainable Agriculture, Chinese Academy of Sciences, Nanjing 210008, P.R.China;

College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R.China;

College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R.China;

College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R.China;

College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, P.R.China;

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Modelling and mapping soil erosion potential in China

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