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[1]LIU Bailing,CAI Qiangguo,SHI Zhihua,et al.Effects of Loess Soil Texture on Raindrop Splash[J].Research of Soil and Water Conservation,2016,23(05):1-6.

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Effects of Loess Soil Texture on Raindrop Splash

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 05 Page number: 1-6 Column: Public date: 2016-10-28

Title:: Effects of Loess Soil Texture on Raindrop Splash

Author(s):: LIU Bailing^1,2, CAI Qiangguo¹, SHI Zhihua², SUN Liying¹, SHENG Hewei³; 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;
3. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China

Keywords:: raindrop plash; loess soil texture; particle size distribution; the form of particle splash out

CLC:: S157;S152

DOI:: -

Abstract:: Soil texture is one of the important factors on raindrop splash erosion and the form of particles splashed out. Rainfall simulation experiments with four loess soils of Lou soil, dark loessial soil, sandy loess, loessial soil, were performed to evaluate effects of soil texture on raindrop splash erosion and splashed particle size distribution (PSD). The results showed that: (1) power function were the best function to describe the splash erosion increases with the rainfall duration, at the beginning of rainfall, the raindrop splash erosion depends on the amount of loose particles on soil surface and the soil particle uniformity, and then the increase rate of raindrop splash erosion depends on the content of clay (< 0.002 mm), fine silt (0.002～0.02 mm) and hygroscopicity clay mineral, the combination makes the increase amplitude of raindrop splash erosion decrease; (2) on the process of raindrop splash, the particle composition of splashed soil particle was determined by the particle composition of experimental bulk soil, if the content of coarse sand (> 0.25 mm) in bulk soil was high the splashed soil had uniform distribution of particle sizes, otherwise when the content of coarse sand in bulk soil was low， the splashed soil particle concentrated distribution in coarse silt and fine sand; (3) the ratio of the splashed undispersed PSD and dispersed PSD revealed the form of particle splashed out, the undispersed/dispersed PSD ratios of clay-sized, fine-silt-sized and coarse-silt-sized particles for four experimental soils were less than 1, indicating that they were splashed out as aggregate, the undispersed/dispersed PSD ratios of sand-sized for Lou soil and dark loessial soil were more than 1, they were splashed out as aggregate, while the undispersed/dispersed PSD ratios of sand-sized for sandy soil and loessial soil were close to 1, they were splashed out as single grain.

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