水土保持研究2024，Vol.31Issue(4)：153-162,10.DOI:10.13869/j.cnki.rswc.2024.04.019
干热河谷区典型植被土壤抗剪性能影响因素评价
Evaluation of Influencing Factors of Soil Shear Performance of Typical Vegetation in Dry-Hot Valley Area
摘要
Abstract
[Objective]The aims of this study are to explore the influence of vegetation on the soil consolidation effect of slope,and to provide data support for preventing soil erosion and reducing soil erosion in the dry-hot valley of Jinsha River.[Method]Four typical vegetations(Acacia confusa,Quercus franchetii,Phyllantthus emblica,Pinus yunnanensis)in Yongren County of Yunnan Province were taken as the research objects.Indoor single root tensile test and direct shear test were carried out to study the difference of soil shear performance of different vegetation types and the influence of various factors on it.[Results](1)The average single root tensile resistance of the four plants decreased in the order:Quercus franchetii＞Phyllantthus emblica＞Pinus yunnanensis＞Acacia confusa.The average tensile strength of single root decreased in the order:Phyllanthus emblica＞Acacia confusa＞Pinus yunnanensis＞Quercus franchetii.The tensile resistance of a single root had an exponential function relationship with the root diameter,and the tensile strength of a single root had a significant negative correlation with the root diameter.(2)Under the four vertical pressures,the shear strength of the four vegetation root-soil composites was greater than that of the plain soil,and the shear strength index varied with the depth of the soil layer.The soil cohesion of the Pinus yunnanensis vegetation had the largest variation with the depth of the soil layer(51.47％),and the internal friction angle of the Quercus franchetii vegetation had the largest variation with the depth of the soil layer(37.96％).(3)The grey correlation method was used to comprehensively analyze the correlation between root tensile properties,soil physical and chemical properties and soil cohesion and internal friction angle.The correlation between cohesion and root tensile strength was the strongest,followed by root tensile resistance,and the water content was the weakest.The correlation between internal friction angle and soil bulk density was the strongest,followed by organic matter,and total potassium was the weakest.[Conclusion]The tensile properties of plant roots and the physical and chemical properties of soil can significantly affect the shear properties of soil,among which the tensile properties of roots have a greater impact on soil cohesion,and have no significant effect on soil internal friction angle.关键词
金沙江干热河谷/根系抗拉/抗剪性能/灰色关联法Key words
Jinsha River dry-hot valley/root tensile/shear performance/grey correlation method分类
农业科技引用本文复制引用
张珉瑞,朱少东,李盼,段青松,杨苑君..干热河谷区典型植被土壤抗剪性能影响因素评价[J].水土保持研究,2024,31(4):153-162,10.基金项目
国家自然科学基金(32060368,31700635) （32060368,31700635）
云南省应用基础研究计划项目(2018FD045) （2018FD045）
