【摘要】 以准格尔煤田黑岱沟露天煤矿排土场生态恢复植被重建中3种4龄人工沙棘(Hippophae rhamnoides),柠条(Caragana microphylla)和紫花苜蓿(Medicago sativa)的根系为对象，进行室内拉伸试验，研究加载速度和根长对3种植物单根抗拉力学特性的影响。结果表明：紫花苜蓿的极限抗拉力和抗拉强度随着加载速度的增加而增加，沙棘单根则随着加载速度的增加，呈单峰型变化趋势，柠条随着加载速度的增加无明显变化规律。柠条和沙棘单根极限抗拉力和抗拉强度，随着根长的增加，呈递减的趋势，即单根长度越短，极限抗拉力和抗拉强度越大，紫花苜蓿单根极限抗拉力和抗拉强度随着根长的增加变化幅度不大，极限抗拉力变动幅度在33.3～38.85 N,极限抗拉强度变动幅度在27.19～31.73 MPa之间。更多还原

【Abstract】 Based on the Jungar coalfield in Heidaigou open-pit coal mine dump in ecological restoration of vegetation reconstruction in 3 artificial Hippophae rhamnoides., Caragana microphylla. and Medicago sativa root as the objects, indoor tensile test was conducted to study the effects of loading speed and root length on the tensile resistance characteristics of single roots of three plants. Results show that the ultimate tensile strength and tensile strength of Medicago sativa increased with the increase of loading speed. The single root of Hippophae rhamnoides. showed a unimodal trend with the increase of loading speed. Caragana microphylla. had no obvious change rule with the increase of loading speed. The ultimate tensile strength and tensile strength of single root of Caragana microphylla. and Hippophae rhamnoides. decreased with the increase of root length, that is, the shorter the length of single root, the greater the ultimate tensile strength and tensile strength. The ultimate tensile strength and tensile strength of Medicago sativa single root changed little with the increase of root length. The ultimate tensile strength and ultimate tensile strength of Medicago sativa single root changed in a range of 33.3N-38.85N and 27.19MPa-31.73Mpa.更多还原