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Variation of Sediment Concentration and Its Drivers Under Different Soil Management Systems

Pedosphere 2010年第5期20卷 578-585页

作者： ZHANG Wen-Tai YU Dong-Sheng SHI Xue-Zheng TAN Man-Zhi LIU Liu-Song state Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 (China) College of Geography Sciences Nanjing Normal University Nanjing 210046 (China) Graduate University of the Chinese Academy of Sciences Beijing 100049 (China)

In order to prevent soil erosion in southern China,a study was performed to determine the drivers of sediment concentration variation using simulated rainfall and four soil management systems under field *** soil management systems,i.e.,forest and grass coverage(FG),forest coverage with disturbed soil surface(FD),contour tillage(CT) and downslope tillage(DT),were exposed to two rainfall intensities(40 and 54 mm h-1) using a portable rainfall *** drivers of sediment concentration variation were determined by the variations of runoff rate and sediment concentration as well as their *** effects of the four soil management systems in preventing water and soil losses were compared using runoff rates and sediment concentrations at steady *** runoff initial stage,sediment concentration variation was mainly driven by rainfall and *** degree of sediment concentration variation driven by flow varied with different soil management *** best relationships between runoff rate and sediment concentration were identified,i.e.,reciprocal(CT),quadratic(FG and FD) and exponential(DT).At steady state,runoff rates of the four soil management systems varied slightly,whereas their sediment concentrations varied *** and CT were recommended as the best soil management systems for preventing water and soil losses.

关键词： runoff rate runoff steady state simulated rainfall soil erosion

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The Suitability of Using Leaf Area Index to Quantify Soil Loss under Vegetation Cover

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Journal of Mountain Science 2011年第4期8卷 564-570页

作者： ZHANG Wentai YU Dongsheng SHI Xuezheng WANG Hongjie GU Zhujun ZHANG Xiangyan TAN Manzhi state Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of SciencesNanjing 21o0o8 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China School of Bio-Chemical and Environmental Engineering Nanjing Xiaozhuang University Nanjing 211171 China

Soil erosion by water under forest cover is a serious problem in southern China.A comparative study was carried out on the use of leaf area index(LAI) and vegetation fractional coverage(VFC) in quantifying soil loss under vegetation *** types of vegetation with varied LAI and VFC under field conditions were exposed to two rainfall rates(40 mm h-1 and 54 mm h-1) using a portable rainfall *** rate,sediment concentration and soil loss rate were measured at relatively runoff stable *** negative exponential relationship(p runoff rate or soil loss *** must be taken when using LAI to quantify the role of certain vegetation in soil and water conservation.

关键词： Leaf area index(LAI) runoff steady state Sediment concentration Simulated rainfall

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