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Quantitative Assessment on Benefits of Soil and Water Conservation at Small-watershed Scale in Red SoO Region of Southern China——A case study of Xingguo Counry,Jiangxi Province

LI Decheng~a;LIANG Yin~a;SUN Xin~(a;b) a.State Key Laboratory of Soil and Sustainable Agriculture;Institute of Soil Science;Chinese Academy of Sciences;Nanjing 210008;China b.College of Forestry Resources and Environment;Nanjing Forestry University;Nanjing 210037;China

  Since the 1980s China has conducted consecutively the comprehensive control activities of soil and water loss(SWL) nation-widely at the scale of the small-watershed and obtained a lot of significant achievements,it is necessary to establish an objective and feasible system to assess quantitatively the benefits of soil and water conservation(SWC) for the adoption of the further proper policies and plans of SWC. Based on the Method of Benefit Calculation for Comprehensive Control of Soil Erosion(GB/T15774-1995) and the corresponding revised draft in 2006,we selected three small-watersheds in Xingguo County of Jiangxi province,a typical region of the severe soil erosion in the red soil region of southern China, established an assessment system which includes 30 indices,covering ecological,economic and social benefits,and then evaluated quantitatively the benefits of SWC.The assessment results were consistent well to the local situations and disclosed generally the ecological,economic and social benefits at the small-watershed scale,which suggest the adopted assessment system is feasible.This assessment system also showed clearly the differences of SWC benefit in different small-watersheds,which suggests the synchronous study of the multi small-watersheds is more informative and useful for instructing the further regional SWC work.There were obvious differences in SWC benefits among the three studied small-watersheds,Tangbei small-watershed enjoys the highest ecological,economic,social and comprehensive benefits and now it should focus on the daily maintaining management,but both Liaogongkeng and Jiaoxi small-watersheds still need to continue the fund input to intensify the work of SWC.……   
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