1.College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing;2.Hunan Forestry Academy,410004,Changsha;3.Soil and Water Conservation Monitoring Station of Hunan Province,410007,Changsha:China
Abstract：In order to evaluate ecological benefits of conversion of cropland to forest in Northwestern Hunan Province scientifically,11 types of conversion of cropland to forest were studied with permanent investigation in 3 rock type areas in Rvrezai small watershed there.The results showed that,1)Both the surface runoff and sediment yields were reduced on the slope lands of afforestation,29.45% of surface runoff and 47.02% of sediment were reduced in the board-shale areas,56.54% of surface runoff and 64.04% of sediment were reduced in the granite areas with terracing,14.16% of surface runoff and 36.27% of sediment were reduced in the lime-rock areas in initial stages of conversion of cropland to forest.2)The surface runoff and sediment yields were reduced greatly by terracing,and average surface runoff and sediment yields on terrace is only 34.92% and 3.66% of that on slope land respectively.3)The surface runoff and sediment yields were decreased greatly with the rainfall declining.The surface runoff and sediment yields caused by the rainfall more than 50mm were 52.17%、70.79% respectively of that in the whole one year.
周刚1,2；田育新2；陈国玉3；符正良3；鲍文3. 湘西北退耕还林初期坡面产流产沙规律研究[J]. 中国水土保持科学, 2009, 7(2): 118-122.
ZHOU Gang-；Tian-Yo-Xin-；Chen-Guo-Yu-；Fu-Zheng-Liang-；Bao-Wen. Runoff and sediment yield on slope land in initial stages of conversion of cropland to forest in Northwestern Hunan Province. SSWCC, 2009, 7(2): 118-122.
2009, Vol. 7 
