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[1]MA Gangan,LI Guanglu,MU Xudong,et al.Effects of Raindrop Diameter on Topsoil Structure and Infiltration Characteristics[J].Research of Soil and Water Conservation,2022,29(06):104-111.

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Effects of Raindrop Diameter on Topsoil Structure and Infiltration Characteristics

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 104-111 Column: Public date: 2022-10-20

Title:: Effects of Raindrop Diameter on Topsoil Structure and Infiltration Characteristics

Author(s):: MA Gangan¹, LI Guanglu^1,2, MU Xudong¹, HOU Weiliang¹; (1.College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Soil Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: raindrop splash; aggregate breakdown; pore clogging; infiltration reduction effect

CLC:: S152.7

DOI:: -

Abstract:: In order to investigate the effect of raindrop splash on the topsoil structure and its infiltration characteristics, and to reveal the deep relationship between soil microstructure and infiltration, simulated rainfall, synchrotron radiation CT scanning and infiltration tests were used to analyse the relationship between the soil structure and infiltration capacity of Lou soil on the Loess Plateau under different raindrop splashing conditions. The results show that:(1)The structure of the disturbed soil was altered, and the number of aggregates and the three-dimensional fractal dimension degree were significantly increased. At the same time, the pore volume and macro-porosity were significantly reduced. The larger the diameter of raindrop, the stronger the degree of fragmentation and the pore clogging rate reached as high as 46.40%;(2)Under the splash of raindrops, the broken aggregates blocked the pores, and thus a dense and low permeable crust was formed on the topsoil, the crust strength increased with the increase of raindrop diameter and splash frequencies;(3)With increasing splash frequencies and raindrop diameters, the infiltration rate decreased gradually. Three splashes later, the infiltration reduction effect reached 91.81%;(4)The steady infiltration rate changed significantly and exponentially with the raindrop's diameter and soil structure parameters. The results showed that the raindrop diameter significantly affected the topsoil structure and infiltration characteristics. The larger the raindrop diameter was, the more dispersed the soil structure was, and the lower the infiltration capacity of soil was.

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Last Update: 2022-10-20