Assessment of sediment yield in a small karst catchment by using 137Cs tracer technique
Assessment of sediment yield in a small karst catchment by using 137Cs tracer technique作者机构：Key Laboratory of Mountain Environment Evolution and RegulationInstitute of Mountain Hazards and EnvironmentChinese Academy of Sciences Graduate University of Chinese Academy of sciences
出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))
年 卷 期：2012年第27卷第4期
页 面：547-554页
核心收录：
学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0815[工学-水利工程]
基 金：supported by the 973 program(Grant No.2006CB403203) the Chinese Science and Technology Ministry(Grant No.2008BAD98B01)
主 题：137Cs Sediment deposition Sediment yield Karst depression Southwest China
摘 要：There is very thin soil layer in karst rocky desertification areas in Southwest China,sediment deposition and sediment yield in the karst area affects the development of vegetation *** the present study,the137Cs technique was used to assess the rate of sediment deposition and sediment yield in a small karst ***137Cs inventory within the depression varied between 800 m-2and 2,200 Bq m-2,with the mean value of 1,500.1 Bq ***137Cs reference inventory at a nearby reference site was 805.9 Bq *** could be inferred to that sediment deposition had occurred in the *** mean depth of sediments deposition in the depression was 6 cm and the deposition rate was approximately 0.13 cm *** analysis of the topographic characteristics of the catchment revealed that the sediment deposition occurred mainly at the lower part of the small ***,there was a sinkhole in the depression,little sediment had drained out with runoff through the sinkhole,because the local people built ridges around the sinkholes for storing *** to this,sediment yield rate in the small catchment was estimated to be approximately 19.25 to 27.5 t km-2yr-1,and the extremely low sediment yield was maybe the main obstacle to vegetation restoration in karst rocky desertification areas.
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