土壤分离能力测定的不确定性分析

发布时间：2018-03-24 19:44

本文选题：土壤侵蚀　切入点：水土保持　出处：《水土保持学报》2017年02期

【摘要】：土壤分离能力是含沙量为零时坡面径流分离土壤的最大值,是确定细沟可蚀性和土壤临界剪切力的基础,也是土壤侵蚀过程模型推广应用的前提,因此,对其准确测量非常关键。在系统分析野外坡面径流小区无法测定土壤分离能力的基础上,从室内试验水槽的类型与规格、土样采集的代表性、测试样品的长度、扰动程度、初始土壤含水量及土样冲刷时间等方面,系统讨论了它们对土壤分离能力的潜在影响与机制,探讨了土壤分离能力测定过程中的不确定性。对深刻理解土壤侵蚀过程的动力机制、选择合理的土壤分离能力测定方法与试验过程,具有重要的指导意义。
[Abstract]:The soil separation ability is the maximum value of the runoff separating soil at 00:00 sloping surface, which is the basis of determining the erodibility of the rill and the critical shear force of the soil, and is also the premise of popularizing and applying the soil erosion process model. On the basis of systematic analysis of the ability of soil separation in field runoff plot, the types and specifications of indoor test tank, the representative of soil sample collection, the length of test sample, the degree of disturbance are analyzed. The potential effects and mechanisms of initial soil moisture content and soil sample scouring time on soil separation ability were discussed systematically. The uncertainty in the determination of soil separation ability is discussed. It is of great significance to understand deeply the dynamic mechanism of soil erosion process and to select a reasonable method and test process for soil separation ability measurement.
【作者单位】：北京师范大学地表过程与资源生态国家重点实验室;北京师范大学地理科学学部;
【基金】：国家自然科学基金重点项目(41530858);国家自然科学基金项目(41271287);国家自然科学基金创新群体项目(41621061)
【分类号】：S157.1

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