title: [Temporal variations of clay content in eroded sediment under different rainfall condition].
abstract: Erosion and sediment characteristics were measured using simulated rainfall on two cultivated soils from the Loess Plateau, China. The size distribution of eroded sediment (non-dispersed) was compared with equivalent measurements of the same samples after chemical and mechanical dispersion(dispersed) to investigate the aggregation ratio (AR) and enrichment ratio (ER). Results show that clay content is increasing with the length and rainfall intensity. The loessial soil increased by 8.77% and 2.43%, but the Lou soil increased by only 2.76% and 0.4%. With the increase of slope, the clay content of the two loess reduced by 4.91% and 3.93%, respectively. AR values were less than 1 and ER values were greater than 1. These indicated that relatively slight clay dispersion occurred and that most of the clay in the sediments was in the form of aggregates. The results will improve understanding of erosion and sedimentation processes, which in turn will improve erosion modeling. Knowledge of temporal variations of clay in sediment can also provide the basis for understanding and modeling the transfer of nutrients on hillslope.
authors.affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China. wuyang.426@163.com
authors.forename: Feng-Zhi
authors.initials: FZ
authors.lastname: Wu
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Shi
authors.forename: Nu-Fang
authors.initials: NF
authors.lastname: Fang
authors.forename: Ben-Jiang
authors.initials: BJ
authors.lastname: Yue
mesh_terms: D000538:Aluminum Silicates / Q000032:analysis*; D002681:China; D000077215:Clay; D003198:Computer Simulation; D003247:Conservation of Natural Resources / Q000379:methods; D010316:Particle Size; D011891:Rain; D012987:Soil / Q000032:analysis*; D062211:Spatio-Temporal Analysis; D014872:Water Movements
chemical_list: D000538:Aluminum Silicates; D012987:Soil; D000077215:Clay