【作者】 格日乐； 刘艳琦； 左志严； 阿如旱； 娜日苏；

【Author】 Gerile;LIU Yan-qi;ZUO Zhi-yan;Aruhan;Narisu;College of Desert Control Science and Engineering,Inner Mongolia Agricultural University;College of grassland and resources and environment,Inner Mongolia Agricultural University;

【机构】 内蒙古农业大学沙漠治理学院； 内蒙古农业大学草原与资源环境学院；

【摘要】 本文利用直剪仪,对内蒙古中西部的5种典型乡土植物柠条、沙棘、杨柴、紫花苜蓿和沙打旺的根系在不同土壤含水率下进行根-土界面直剪摩擦试验研究,分析不同土壤水分下不同植物根系与土壤界面的摩阻特性。结果显示,当土壤含水率在4.5%-24.5%之间变动时,5种植物根-土界面摩擦系数均大于素土的土-土界面的值,且随着土壤含水率的增加,根-土界面及素土的土-土界面摩擦系数均呈下降趋势,其中沙棘根-土界面的摩擦系数和粘聚力均大于其它4种植物的值,表明仅从根-土界面摩阻特性来看,沙棘根系固土抗蚀的作用明显优于其他4种植物。根-土界面及素土土-土界面粘聚力随着土壤含水率的增加呈先增后减的变化特征,且植物种不同粘聚力峰值出现时对应的土壤含水率亦不同。更多还原

【Abstract】 The direct shear friction test under different soil moisture content is tested by shear apparatus for 5 kinds of typical local plant roots distributed in the Midwest of Inner Mongolia.The species are Caragana Korshinskii、Hippophae rhamnoides、Hedysarum fruticosum、Medicago sativa、Astragalus adsurgens.Results show that when the soil moisture content is varied between 4.5%-24.5%,plant root-soil interface friction coefficients of the 5 plants were greater than the value of the soil-soil interface,the friction coefficients of root-soil interface and soil-soil interface decline with the increase of soil moisture content,the friction coefficient and cohesion of the root-soil interface of Hippophae rhamnoides are greater than other 4 kinds of plant,the effects of the fixed soils and resistance erosion of the Hippophae rhamnoides root are superior to other 4 species.With the increase of soil moisture content,the change characteristics of the root-soil interface and the soil-soil interface are reduced and the cohesion peaks appear differently for different plant species at different soil moisture content.更多还原