Soil aggregate breakdown is the first key factor that causes soil erosion.At present,research on the mechanisms of soil aggregate breakdown during rainfall is common.However,the research to on quantifying the relative contributions of internal and external forces to aggregate breakdown remains limited.This paper was conducted to analyse the relative contribution of internal and external forces to aggregate disintegration and the factors affecting aggregate stability during rainfall.Soil aggregates with a series of textures were selected as test soil samples;deionized water was employed as the soaking solution and rainfall material in static disintegration experiments and rainfall simulation tests.The effect of internal force(soil hydrophilicity)on aggregate disintegration was analysed by the static disintegra-tion method,and the combined effects of internal force(soil hydrophilicity)and external force(raindrop impact)on soil aggregate breakdown were analysed by rainfall simulation experiments.The results indicated that external force caused more severe soil aggregate breakdown than internal force,and the crushed aggregate was mainly distributed in the range of 2-0.25 mm.With increasing rainfall kinetic energy,the degree of aggregate breakdown increased gradually,and the degree of aggregation of the soil particles decreased gradually.Furthermore,soil aggregates with a high clay content(＞30％)were more stable than medium-clay(20-30％)and low-clay(＜20％)soil aggregates,and the correlation coefficient provided a good representation of the relationship between the clay content and soil aggregate stability index(ASI).Therefore,external force contributed more to soil aggregate breakdown than internal force during rainfall,and clay plays an important role in aggregate stability.The results of this study are of great significance for elaborating the mechanism and factors affecting aggregate breakdown.

College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Region(Ministry of Education),Southwest University,Chongqing 400715,China;Key Laboratory of Arable Land Conservation(Southwestern China),Ministry of Agriculture,Chongqing 400715,China;State Cultivation Base of Eco-agriculture for Southwest Mountainous Land,Southwest University,Chongqing 400715,China;College of Forestry,Guizhou University,Guiyang 550025,China

[1]Jiangwen Li;Shouqin Zhong;Zhen Han;Pengfei Gao;Chaofu Wei-.The relative contributions of soil hydrophilicity and raindrop impact to soil aggregate breakdown for a series of textured soils)[J].国际水土保持研究（英文）,2022(03):433-444

disintegra

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