Technical ArticleSoil Erosion Assessment in the Red Soil Region of Southeast China Using an Integrated IndexLiang, Yin; Li, Decheng; Su, Chunli; Pan, XianzhangAuthor Information Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China. Dr. Li is corresponding author. E-mail: [email protected] Received November 6, 2008, and in revised form August 18, 2009. Accepted for publication August 20, 2009. Soil Science: October 2009 - Volume 174 - Issue 10 - p 574-581 doi: 10.1097/SS.0b013e3181bd4a5a Buy Metrics Abstract A new method to calculate the integrated index of soil erosion (EI) for the Red Soil Region of Southeast China is proposed. The median of erosion rates for the extreme severe erosion grade was calculated by using the method of polynomial fitting curve and others based on the medians and the corresponding grades of soil erosion in the Classification Standard of Soil Erosion (SL190-96); then the weight values were calculated for each erosion grade. Based on EI values in 1986, 1996, and 2002, the evolution of soil erosion was studied in a total of 8 provinces and in a total of 476 counties of southeastern China. The results show that the overall EI value of the whole Red Soil Region of Southeast China decreased from 3.81 to 3.02 from 1986 to 2002, although EI values increased in 163 counties, decreased in 285 counties, and remained stable in 28 counties, which reflects a general alleviation of soil erosion. The EI values decreased in Jiangxi, Fujian, and Zhejiang provinces, but increased in Guangdong and Hunan provinces. The increases are mainly attributed to rapid social and economic development with insufficient attention to soil erosion. © 2009 Lippincott Williams & Wilkins, Inc.