黄土丘陵区冻融对土壤抗冲性及相关物理性质的影响

李 强; 刘国彬; 许明祥; 孙 会; 张 正; 高丽倩

doi:10.3969/j.issn.1002-6819.2013.17.014

黄土丘陵区冻融对土壤抗冲性及相关物理性质的影响

Effect of seasonal freeze-thaw on soil anti-scouribility and its related physical property in hilly Loess Plateau

摘要

摘要: 在股状水流侵蚀比较发育的黄土丘陵区，土壤可蚀性主要依赖于土壤抗冲能力。为了揭示季节性冻融对土壤抗冲性的影响，该文借助模拟冲刷试验，设置了裸地对照（CK）、黑麦草传统密度（LD）和加倍密度（HD）3种处理，测定并分析了冻融前后土壤物理性质及其抗冲性。结果表明，与冻融前相比，表层土壤容重、团聚体含量和根系密度在3个处理中均未发生显著变化（P＜0.05），土壤黏聚力略有下降，而崩解速率在处理CK、LD和HD中分别增加了20.6%、18.8%和7.3%。冻融作用延后了3个处理的主要产沙时间，降低了土壤抗冲能力，增加了冲刷中途泥沙流失速率。与未冻融相比，冻融作用增加了处理CK和LD泥沙流失量为19.41%和6.70%，但对处理HD影响较小（P＜0.05）。冻融和根系共同作用在LD和HD处理上分别减少土壤流失量为3.72%和49.39%。该研究期望对完善土壤侵蚀机理提供一定的参考价值。

Abstract: Seasonal freeze-thaw plays a significant role in soil properties as well as the management of soil and water resources in northern latitudes. Soil erodibility primarily relies on soil anti-scouribility (AS) in the concentrated flow erosion zones of the Loess Plateau. An understanding of the characteristics of freeze-thaw soil is essential for erosion essence in the seasonal freeze-thaw area. The primary goal of this study was to evaluate the differences in soil AS and its related freeze-thaw-induced soil physical properties, as well as root density before and after a cycle of freeze-thaw.

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