土石山区护坡草本植物根系抗拉力学特性

发布时间：2018-03-25 16:26

  本文选题：根系　切入点：水土保持　出处：《中国水土保持科学》2017年04期

【摘要】：为了解山西省土石山区护坡植物的根系抗拉力学特性,对比选择最适宜的水土保持物种。对其边坡上黑麦草(Lolium perenne L.)、香根草(Vetiveria zizanioides L.)、百喜草(Paspalum notatum Flugge)3种护坡植物的根系开展抗拉力学试验,研究3种植物根系最大抗拉力、极限抗拉强度以及弹性模量随直径及根长大小变化的规律。研究结果显示:根长一定时,3种植物的最大抗拉力随直径的增加而增加,单根极限抗拉强度随根系直径的增大而减小;而直径一定时,根系最大抗拉力和极限抗拉强度随根系长度的增大而减小;弹性模量值随着根径和根长增大呈下降的趋势。3种植物根系平均最大抗拉力关系为:香根草(16.258 N)黑麦草(11.734 N)百喜草(4.891 N);平均极限抗拉强度关系为:百喜草(116.226 MPa)黑麦草(50.839 MPa)香根草(49.650 MPa);平均弹性模量分别为:百喜草(20.392 MPa/mm)香根草(3.257 MPa/mm)黑麦草(3.245 MPa/mm)。结果表明这3种植物中百喜草根系的固土能力最好,在选择最为适宜的水土保持物种时可优先考虑。研究结果可为土石山区水土保持研究提供一定的科学依据。
[Abstract]:In order to understand the root tensile properties of slope protection plants in the earth-rock mountain areas of Shanxi Province, To compare and select the most suitable species of soil and water conservation, to study the maximum tensile strength of the roots of three species of ryegrass, Lolium perenne L., Vetiveria zizanioides L., and Paspalum notatum Flugge)3 on the slope. The variation of ultimate tensile strength and modulus of elasticity with diameter and root length. The results show that the maximum tensile strength of three species of plants increases with the increase of diameter when the root length is fixed. The ultimate tensile strength of single root decreases with the increase of root diameter, and the maximum tensile strength and ultimate tensile strength of root decrease with the increase of root length. The value of elastic modulus decreased with the increase of root diameter and root length. The average maximum tensile strength of root system of three species of plants was: Vetiveria villosum 16.258 N) ryegrass 11.734 N) Bahia 4.891 Nm, and the average ultimate tensile strength relationship was 116.226 MPa) black. The average modulus of elasticity was 20.392 MPA / mm) and 3.257 MPA / mm) the ryegrass was 3.245 MPA / mm.The results showed that the root system of the three plants had the best soil retention ability. Priority should be given to the selection of the most suitable species for soil and water conservation, and the results can provide a scientific basis for the study of soil and water conservation in earth-rock mountain areas.
【作者单位】： 太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金“黄土丘陵区灌草植物固土护坡过程中根系破坏机理试验研究”(31600582) 山西省高等学校创新人才支持计划
【分类号】：S157.43

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