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| Quantitative assessment of impacts on decreasing erosion by soil and water conservation measures in Yanhe River Basin |
| Xie Hongxia1,2,Yang Qinke2,Li Rui2,Zhang Xiaoping2,Cheng Lin2,Pang Guowei2 |
| 1.College of Resources and Environment Sciences,Hunan Agricultural University,410128,Changsha;2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,712100,Yangling,Shaanxi: China |
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Abstract This study collected the daily precipitation data from 35 gauges in the period of 1953 to 2006,soil type map,a digital elevation model(DEM),data of soil and water conservation measures,land use maps interpreted from Landsat TM images acquired in 1986,1997 and 2006 and NDVI maps calculated from the images of the same period.Then we used the CSLE model to calculate soil loss amount of every grid unit with the soil erosion factors map layers,simulated soil erosion of 1997 and 2006 based on the state of soil and water conservation measures in 1986,and analyzed the impacts on soil erosion by soil and water conservation measures.Change of soil and water conservation measures from 1986 to 1997 and to 2006 decreased soil erosion amount by 960 000 t and 6 280 000 t in 1997 and 2006 respectively.Considering special rainfall character in 2006 different from the ordinary rainfall character in a long period,the decreased soil loess amount in 2006 by soil and water conservation is 1 400 000 t.This result would provide some references for benefit assessment of soil and water conservation.
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Received: 04 March 2010
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