| Cite this article: | 王健,宋鹏帅,赵宇,等.降雨对坡面结皮土壤水稳性团聚体的影响[J].灌溉排水学报,0,():-. |
| Wang Jian,Song Pengshuai,Zhao Yu,et al.降雨对坡面结皮土壤水稳性团聚体的影响[J].灌溉排水学报,0,():-. |
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| Effect of Rainfall on Water Stability Aggregates of Crust Soil on Slope Surface |
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Wang Jian1,2, Song Pengshuai1,2, Zhao Yu1,2, Ma Yuhong1,2
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1.Northwest A&2.F University
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| Abstract: |
| 【Objective】The distribution of water-stable aggregates in crust soils on different slopes caused by rainfall was studied. 【Method】Artificial rainfall simulation was used to study the change of water-stable aggregates in crust soil under the impact of rainfall. Influenced by micro-topography, surface crust properties show differences. The water-stable aggregates of surface crust soils at different locations on slopes were studied, and the soil samples without crust at the bottom were taken as controls. Study on the Change of Soil Aggregates in Different Crust Types by Yoder Wet Screening Method. 【Result】Under the impact of rainfall, taking 5 minutes of rainfall as an example, crusts at different locations 1)Soil water-stable aggregates are characterized by large aggregates proportion. Structural crust contains the largest aggregates, followed by transitional zone and undisturbed soil, and sedimentary crust is the smallest. The proportion of macroaggregates in undisturbed soil, structural crust, transitional zone and sedimentary crust were 37.69%, 41.95%, 37.05% and 28.93% respectively. With the continuation of rainfall, soil macroaggregates in structural crusts and transitional zones increased significantly, while those in sedimentary crusts decreased slightly. 2) Average equivalent diameter and geometric average diameter of soil water-stable aggregates vary greatly. The average equivalent diameters of undisturbed soil, structural crust, transitional zone and sedimentary crust are 0.15, 0.19, 0.17 and 0.12 mm, respectively. The geometric average diameters are 0.16, 0.21, 0.19 and 0.14 mm, respectively. The average equivalent diameter and geometric average diameter of water-stable aggregates in structured crust soil are the largest, followed by transition zone and undisturbed soil, and sedimentary crust is the smallest. 3) The fractal dimension D of soil water-stable aggregates is different, but the difference is not significant. The fractal dimensions D of water-stable aggregates in undisturbed soil, structural crust, transitional zone and sedimentary crust are 2.725, 2.705, 2.725 and 2.737, respectively. The fractal dimension of water-stable aggregates in sedimentary crusts is the largest, followed by transitional zone and undisturbed soil, and structural crusts are the smallest. 【Conclusion】 Rainfall strikes disperse large aggregates and enrich small aggregates in the soil surface. The higher the content of macroaggregates, the more stable the soil structure, the stronger the anti-erosion ability; on the contrary, the weaker the anti-erosion ability. |
| Key words: Soil aggregates; Wet screening method; Crust; Rainfall duration |
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