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[1]ZHAO Hengce,WEI Xia,HE Yan,et al.Effects of Freeze-Thaw on Soil Aggregate Characteristics and Erodibility Factor K[J].Research of Soil and Water Conservation,2019,26(05):1-6,13.

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Effects of Freeze-Thaw on Soil Aggregate Characteristics and Erodibility Factor K

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 1-6,13 Column: Public date: 2019-09-06

Title:: Effects of Freeze-Thaw on Soil Aggregate Characteristics and Erodibility Factor K

Author(s):: ZHAO Hengce, WEI Xia, HE Yan, YU Wenzhu, WANG Tao; College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China

Keywords:: freeze-thaw action; water-stable aggregate; fractal dimension D; erodibility factor K

CLC:: S152.4;S158.5

DOI:: -

Abstract:: In order to clarify the effect of freeze-thaw on soil aggregate characteristics, and to explore the changes of soil erodibility under freeze-thaw damage mechanism, the soil in Shenzhou, Hebei province was selected as the research sample. We analyzed the changes of the contents of aggregates, 0.25 mm water stability aggregate content, mean weight diameter, geometric mean diameter, fractal dimensions D of the aggregates and soil erodibility factor K in the soil water-stable aggregates of 0-10 cm and 10-20 cm depths. Soil moisture content is one of the direct factors which influence the content of aggregates; the freeze-thaw action cracked and separated the aggregate, resulting in the imbalance of the structure of aggregate and thus caused soil layers to gradually refine with increase of soil depth. Fractal dimension D indicates that the aggregate content of 2~1 mm diameter is a critical factor on the soil stability in 0-20 cm depth. The erodibility factor K shows that the freeze-thaw action reduces the soil erosion resistance. Along the direction of soil depth, the K value of soil erodibility gradually increases and the erosion resistance gradually decreases. The freeze-thaw effect breaks the soil aggregate and increases the erodibility. This study can provide scientific reference for the prediction of soil erosion under the influence of freeze-thaw action.

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