本文選題：根系　切入點(diǎn)：水土保持　出處：《中國(guó)水土保持科學(xué)》2017年04期

【摘要】：為了解山西省土石山區(qū)護(hù)坡植物的根系抗拉力學(xué)特性,對(duì)比選擇最適宜的水土保持物種。對(duì)其邊坡上黑麥草(Lolium perenne L.)、香根草(Vetiveria zizanioides L.)、百喜草(Paspalum notatum Flugge)3種護(hù)坡植物的根系開展抗拉力學(xué)試驗(yàn),研究3種植物根系最大抗拉力、極限抗拉強(qiáng)度以及彈性模量隨直徑及根長(zhǎng)大小變化的規(guī)律。研究結(jié)果顯示:根長(zhǎng)一定時(shí),3種植物的最大抗拉力隨直徑的增加而增加,單根極限抗拉強(qiáng)度隨根系直徑的增大而減小;而直徑一定時(shí),根系最大抗拉力和極限抗拉強(qiáng)度隨根系長(zhǎng)度的增大而減小;彈性模量值隨著根徑和根長(zhǎng)增大呈下降的趨勢(shì)。3種植物根系平均最大抗拉力關(guān)系為:香根草(16.258 N)黑麥草(11.734 N)百喜草(4.891 N);平均極限抗拉強(qiáng)度關(guān)系為:百喜草(116.226 MPa)黑麥草(50.839 MPa)香根草(49.650 MPa);平均彈性模量分別為:百喜草(20.392 MPa/mm)香根草(3.257 MPa/mm)黑麥草(3.245 MPa/mm)。結(jié)果表明這3種植物中百喜草根系的固土能力最好,在選擇最為適宜的水土保持物種時(shí)可優(yōu)先考慮。研究結(jié)果可為土石山區(qū)水土保持研究提供一定的科學(xué)依據(jù)。
[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.
【作者單位】： 太原理工大學(xué)水利科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金“黃土丘陵區(qū)灌草植物固土護(hù)坡過(guò)程中根系破壞機(jī)理試驗(yàn)研究”(31600582) 山西省高等學(xué)校創(chuàng)新人才支持計(jì)劃
【分類號(hào)】：S157.43

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