ZHAO Hengce,WEI Xia,HE Yan,et al.Effects of Freeze-Thaw on Soil Aggregate Characteristics and Erodibility Factor K[J].Research of Soil and Water Conservation,2019,26(05):1-6,13.
冻融对土壤团聚体特征以及可蚀性K值的影响
- Title:
- Effects of Freeze-Thaw on Soil Aggregate Characteristics and Erodibility Factor K
- 分类号:
- S152.4;S158.5
- 摘要:
- 为明确冻融作用对土壤团聚体特征的影响，并探讨冻融破坏机理下土壤可蚀性变化，以河北省深州市土壤为研究对象，分析研究了0—10，10—20 cm深度土壤水稳性团聚体中各粒径团聚体含量、0.25 mm水稳性团聚体含量WSA、团聚体平均质量直径MWD、团聚体几何平均直径GMD、分形维数D和可蚀性K值之间变化。结果表明：含水量是影响土壤水稳性团聚体含量的直接因素之一；冻融作用使大团聚体破解、分离，导致团粒结构比例失调，土层自上而下团粒呈逐渐细化状态；分形维数D表明2～1 mm粒径团聚体含量对0—20 cm深度土壤稳定性起关键因素；可蚀性K值表明，冻融作用降低了土壤抗侵蚀能力，沿土层深度方向，土壤可蚀性K值逐渐增加，抗侵蚀能力逐渐降低。冻融作用使团聚体破碎，土壤可蚀性增加。本研究为冻融作用机理下土壤侵蚀预报提供科学参考。
- Abstract:
- In order to clarify the effect of freeze-thaw on soil aggregate characteristics, and to explore the changes of soil erodibility under freeze-thaw damage mechanism, the soil in Shenzhou, Hebei province was selected as the research sample. We analyzed the changes of the contents of aggregates, 0.25 mm water stability aggregate content, mean weight diameter, geometric mean diameter, fractal dimensions D of the aggregates and soil erodibility factor K in the soil water-stable aggregates of 0-10 cm and 10-20 cm depths. Soil moisture content is one of the direct factors which influence the content of aggregates; the freeze-thaw action cracked and separated the aggregate, resulting in the imbalance of the structure of aggregate and thus caused soil layers to gradually refine with increase of soil depth. Fractal dimension D indicates that the aggregate content of 2~1 mm diameter is a critical factor on the soil stability in 0-20 cm depth. The erodibility factor K shows that the freeze-thaw action reduces the soil erosion resistance. Along the direction of soil depth, the K value of soil erodibility gradually increases and the erosion resistance gradually decreases. The freeze-thaw effect breaks the soil aggregate and increases the erodibility. This study can provide scientific reference for the prediction of soil erosion under the influence of freeze-thaw action.
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备注/Memo
收稿日期:2018-11-24;改回日期:2018-12-08。
基金项目:兰州大学西部环境教育部重点实验室开放基金及兰州大学中央高校基本科研业务费专项基金（lzujbky-2018-kb01）；国家自然科学基金（41001154）；中国博士后科学资助项目（20110490862）；中央高校基本科研业务费专项资金资助（lzujbky-2015-149）
作者简介:赵恒策(1992-),男,河北衡水人,硕士研究生,研究方向为土壤侵蚀。E-mail:zhaohc16@lzu.edu.cn
通讯作者:魏霞(1980-),女,陕西扶风人,博士,副教授,主要从事土壤侵蚀与水土保持、水文学及水资源学等方面的研究。E-mail:weix@lzu.edu.cn