冻融条件下土壤侵蚀阻力影响因素
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卢超(1995-),男,新疆伊犁人,硕士研究生,主要从事水土保持及土壤侵蚀研究。E-mail:2350031627@nwafu.edu.cn

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国家自然科学基金项目(52179079,41877076);黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目(F2010121002-202311,F2010121002-202319);中央高校基本科研业务费专项资金项目(2022HHZX003)


The Factors Influencing Soil Erosion Resistance Under Freeze-thaw Conditions
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    摘要:

    为揭示季节性冻融区土壤侵蚀阻力的变化机制,确定影响土壤侵蚀阻力主控因子,通过室内冻融模拟、水槽冲刷和土壤抗剪试验,对黄绵土(SM粉质壤土)、风沙土(WS砂壤土)和黑土(KS黏壤土)侵蚀阻力影响因素进行研究。结果表明:(1)随着冻融循环次数增加,细沟可蚀性值逐渐升高,而临界剪切力降低。经历10次冻融循环后,SM粉质壤土、WS砂壤土和KS黏壤土的细沟可蚀性分别增加76%,63%,11%,临界剪切力分别减小37%,13%,91%。(2)细沟可蚀性随土壤抗剪强度、黏聚力和内摩擦角增大而减小,临界剪切力则呈相反趋势。与内摩擦角相比,黏聚力更适合用来表征土壤侵蚀阻力。采用黏聚力对SM粉质壤土、WS砂壤土和KS黏壤土的细沟可蚀性进行预测,决定系数(R2)分别为0.42,0.78,0.50,平均为0.57;对临界剪切力的预测效果较差,决定系数(R2)分别为0.16,0.14,0.18,平均仅为0.16。(3)根据皮尔逊相关分析结果,基于土壤的初始含水率、冻融循环次数、力学特性以及土壤参数等分别建立细沟可蚀性(R2=0.85)和临界剪切力(R2=0.79)预测模型表明,在季节性冻融区冻融循环作用对土壤侵蚀的影响巨大,结果可为各地区水土保持措施优化和土壤侵蚀防治提供参考。

    Abstract:

    In order to reveal the change mechanism of soil erosion resistance in seasonal freeze-thaw region and determine the main controlling factors affecting soil erosion resistance, the Loess soil (SM silty loam), Aeolian sandy soil (WS sandy loam) and Black soil (KS clay loam) were studied by indoor freeze-thaw simulation, flume erosion test and soil shear test. The results showed that: (1) With the increase of freeze-thaw cycles, the value of rill erodibility gradually increased, while the critical shear stress decreased. After ten freeze-thaw cycles, the rill erodibility of SM silty loam, WS sandy loam and KS clay loam increased by 76%, 63% and 11%, respectively, and the critical shear stress decreased by 37%, 13% and 91%, respectively. (2) Rill erodibility decreased with the increase of soil shear strength, cohesion and internal friction angle, while the critical shear stress showed the opposite trend. Compared with the internal friction angle, cohesion was more suitable to characterize soil erosion resistance. The rill erodibility of SM silty loam, WS sandy loam and KS clay loam was predicted by cohesion, and the determination coefficients R2 were 0.42, 0.78 and 0.50, respectively, with an average of 0.57. The prediction effect on the critical shear stress was poor, and R2 were 0.16, 0.14 and 0.18, respectively, with an average of only 0.16. (3) According to the results of Pearson correlation analysis, the prediction models of rill erodibility (R2=0.85) and critical shear stress (R2=0.79) were established based on initial soil moisture content, freeze-thaw cycles, mechanical properties and soil parameters, respectively. Studies have shown that the effects of freeze-thaw cycles on soil erosion are enormous in areas with seasonal freeze-thaw region. The findings can serve as a reference for optimizing soil and water conservation practices and controlling soil erosion across different regions.

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卢超, 马周加态, 李佳辉, 张宽地.冻融条件下土壤侵蚀阻力影响因素[J].水土保持学报,2023,37(6):25~33

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  • 收稿日期:2023-04-07
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  • 在线发布日期: 2023-12-27
  • 出版日期: 2023-12-28