[1]ZHANG Yifei,WANG Ling,XU Ling,et al.Splash Erosion Characteristics and Turnover Process of Red Soil Aggregates Driven by Rainfall[J].Research of Soil and Water Conservation,2023,30(04):27-33,41.[doi:10.13869/j.cnki.rswc.2023.04.033.]
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Splash Erosion Characteristics and Turnover Process of Red Soil Aggregates Driven by Rainfall
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
27-33,41
Column:
Public date:
2023-06-10
- Title:
- Splash Erosion Characteristics and Turnover Process of Red Soil Aggregates Driven by Rainfall
- Keywords:
- red soil aggregate; splash erosion; rare earth element tracing method; dynamic turnover model
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.04.033.
- Abstract:
- [Objective] The aim of this study is to explore the process of breakdown and formation of soil aggregates driven by rainfall, and then to enrich the research of mechanisms of soil erosion. [Methods] Based on the rare earth element tracing method, a variety of rare earth elements were used to label soil aggregates with various particle sizes. Splash erosion tests were conducted under the stimulated rainfall intensity of 90 mm/h with the different rainfall characteristic parameters controlled(rainfall duration, raindrop size)to obtain the changes of distribution of mass and rare earth element content of soil aggregates(2～5 mm, 0.25～2 mm, 0.053～0.25 mm, <0.053 mm), the turnover paths between aggregates could be quantitatively analyzed. [Results] The splash amounts and rates increase with the increase of rainfall kinetic energy, most of which range in 0.25～2 mm. Except for the >2 mm particles which directly originate from large aggregates, the splash particles whose diameter are <0.25 mm are mainly formed by the crushing of large-size aggregates, and the highest can reach 73.83%; the second is the aggregates of the current particle size knocked off by the raindrop, with little aggregates of small-sized particles adsorbed and bound together. In the dynamic turnover process of residual aggregates, the formation and breakdown processes between adjacent-level aggregates are mainly responsible, among which the breakdown of large aggregates that produces small aggregates and the formation of the small aggregates that originate from silt and clay have higher contribution rates to the breakdown or forming direction of the current size aggregates, reaching 24.06%～42.15% and 36.83%～70.76%, respectively, and with the change of rainfall durations, the large aggregates are first broken into smaller aggregates, then microaggregates and silt and clay step by step, and the proportion of aggregates that do not participate in dynamic turnover gradually decrease. [Conclusion] Splash erosion continuously drives the turnover process of soil aggregates and has a great impact on splash erosion characteristics. In the future, the research on soil nutrient migration should be introduced to improve the quantitative model of soil erosion process.
- References:
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Last Update:
2023-06-10