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[1]Jiao Fanxu,Hou Weiliang,Li Guanglu.Study on Soil Cementation and Aggregate Distribution Characteristics Under Rainfall Conditions[J].Research of Soil and Water Conservation,2024,31(06):109-118.[doi:10.13869/j.cnki.rswc.2024.06.029]

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Study on Soil Cementation and Aggregate Distribution Characteristics Under Rainfall Conditions

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 06 Page number: 109-118 Column: Public date: 2024-12-10

Title:: Study on Soil Cementation and Aggregate Distribution Characteristics Under Rainfall Conditions

Author(s):: Jiao Fanxu, Hou Weiliang, Li Guanglu; (College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: raindrop splash; thin layer runoff; cementing agents; aggregate microstructure

CLC:: S152.4

DOI:: 10.13869/j.cnki.rswc.2024.06.029

Abstract:: [Objective]The aims of this study are to analyze the influence of raindrop splash on the content of soil cement and the distribution characteristics of soil aggregates in the surface soil layer, and to reveal the relationship between the soil cementation status and the changes of aggregates under rainfall conditions. [Methods]Study on the content of aggregates cement in the sediment and the spatial distribution of topsoil aggregates were investigated by indoor simulated rainfall tests, physicochemical analyses and synchrotron radiation computer scanning(SR-μCT)technology. [Results](1)The order of the content of each cement in the sediment was calcium carbonate>organic carbon>free iron oxide>free alumina>six-carbon sugar. The content of the cement in the sediment increased with the increase of the raindrop diameter under the same thin-layer runoff. The content of the cement showed a fluctuating change of increasing and then decreasing with the increase of the thin-layer runoff under the same raindrop diameter. The combined effect of raindrop splash and runoff washout on the content of six-carbon sugar, free iron oxide, free aluminium oxide at<0.053 mm particle size and six-carbon sugar, free iron oxide, calcium carbonate and organic carbon at 0.25～2 mm particle size was significant(p<0.05).(2)Under the same thin-layer runoff, the total number of aggregates(A), the number of microaggregates(<0.25 mm), and the specific surface area(SSA)increased with the increase of raindrop diameter in topsoil. The volume percentage of macroaggregates(V_mac), the number of macroaggregates(>0.25 mm), and the geometric mean diameter(GMD)decreased with the increase of raindrop diameter. For the same raindrop diameter, with the increase of thin-layer runoff, the SSA decreased and the GMD increased.(3)The five types of binder in the sediment were significantly correlated with the structural parameters of the topsoil aggregates(p<0.05). The higher the content of binder in the sediment, the larger the A and SSA, and the smaller the GMD and V_mac. [Conclusions]Raindrop splash thin-layer runoff increases the loss of topsoil aggregate cement migration and increases the cement content in the sediment. The decrease in topsoil aggregate cement content under rainfall erosion is the main reason for the structural damage and the stability decline of soil aggregates.

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Last Update: 2024-12-10