[1]魏 宁,魏 霞,Huang Chihua.交替冻融对土壤临界剪切力和土壤细沟可蚀性的影响[J].水土保持研究,2021,28(03):19-24.
　WEI Ning,WEI Xia,HUANG Chihua.Influence of Freeze-Thaw Effects on Soil Critical Shear Stress and Soil Rill Erodibility[J].Research of Soil and Water Conservation,2021,28(03):19-24.
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交替冻融对土壤临界剪切力和土壤细沟可蚀性的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 28 期数: 2021年03期 页码: 19-24 栏目: 出版日期: 2021-04-20
Title:
Influence of Freeze-Thaw Effects on Soil Critical Shear Stress and Soil Rill Erodibility
文章编号:
1005-3409(2021)03-0019-06
作者:
魏 宁1, 魏 霞2,3, Huang Chihua3
(1.西北农林科技大学 理学院, 陕西 杨陵 712100; 2.兰州大学 资源环境学院, 兰州 730000; 3.Agronomy Dep., Purdue Univ., and USDA-ARS National Soil Erosion Research Lab., 275S Russell St, West Lafayette, IN 47907-2077,USA)
Author(s):
WEI Ning1, WEI Xia2,3, HUANG Chihua3
(1.College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 3.Agronomy Department, Purdue University, USDA-ARS National Soil Erosion Research Laboratory, West Lafayette, IN 47907-2077, USA)
关键词:
冻融作用;  变流量冲刷;  土壤临界剪切力;  土壤细沟可蚀性
Keywords:
effects of freeze-thaw;  variable flow scouring;  soil critical shear stress;  soil erodibility
分类号:
S157
文献标志码:
A
摘要:
为了揭示冻融作用对土壤临界剪切力和细沟土壤可蚀性的影响,为冻融作用影响下的土壤侵蚀预报提供科学依据,通过室内交替冻融循环试验和变流量微型“V”型水槽人工放水冲刷试验,研究了交替冻融作用影响下土壤临界剪切力和土壤细沟可蚀性的变化特征。试验设计了参照试验(CK),3种交替冻融循环周期处理(1,3,6)和2种土壤质量含水率水平(10%,20%)。结果表明:不同试验处理对土壤临界剪切力和土壤细沟可蚀性的影响程度和趋势不同。当冻融循环周期为1时,土壤的临界剪切力和土壤细沟可蚀性相比参照试验呈现增大的趋势; 当冻融循环周期继续增大至3,6时,土壤的临界剪切力和土壤细沟可蚀性相对于参照试验呈减小趋势。当冻融循环周期相同时,10%含水率水平下的土壤临界剪切力和土壤细沟可蚀性均大于20%含水率水平下的土壤临界剪切力和土壤细沟可蚀性。研究为冻融作用影响下土壤侵蚀的预报提供重要参考。
Abstract:
In order to reveal the influence of freeze-thaw effects on soil erosion by water, effects of freeze-thaw on the variation of critical shear stress under the influence of effects of freeze-thaw were studied by alternately freezing-thawing tests and scouring tests. Three kinds of freeze-thaw cycles(1, 3 and 6), two kinds of soil moisture mass fractions(10% and 20%)and control test(CK)were involved. The results show that different experimental treatments have different impact degrees and different impact tendency on soil critical shear stress and soil erodibility; when test soil experiences one freeze-thaw cycle, soil critical shear stress and soil erodibilty show the increasing trend compared to the control experiment; when the freeze-thaw cycle continues to increase to 3 and 6, the soil critical shear stress and soil erodibility show the decreasing trend compared to the control experiment, and when freeze-thaw cycle is equal to 3, soil critical shear stress and soil erodibility were minimum; Soil moisture mass fraction has the significant effect on soil critical shear stress and soil erodibility; when freeze-thaw cycles are same, soil critical shear stress and soil erodibility under 10% soil moisture mass fraction are bigger than the corresponding values under 20% soil moisture mass fraction. These results can provide the support for soil erosion prediction in the context of freeze-thaw cycle.

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备注/Memo

收稿日期:2020-06-21 修回日期:2020-07-02
资助项目:国家自然科学基金(51679115); 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)
第一作者:魏宁(1981—),女,陕西扶风人,硕士,讲师,主要从事应用数学与统计学方面的研究。E-mail:weining@nwafu.edu.cn
通信作者: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

更新日期/Last Update: 2021-04-20