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Influence of soil moisture content on pullout properties of hippophae rhamnoides linn. roots

Journal of Mountain Science 2020年第11期17卷 2816-2826页

作者： ZHANG Chao-bo LIU Ya-ting LI Dong-rong JIANG Jing College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Plant root system plays an important role in preventing soil erosion and improving slope ***,its performance is significantly affected by soil moisture content,and the role of soil moisture in root reinforcement is not fully *** this study,the influence of soil moisture on root pullout properties was studied by *** in-situ pullout tests under four different levels of soil matric suction(12 kPa,18 kPa,24 kPa,30 kPa)were carried out on roots of sea buckthorn plants(hippophae rhamnoides linn.)which were artificially cultivated for 7 *** and length of the root system of sea buckthorn were *** results showed that a very significant correlation was observed between root diameter(D)and root length(L)(P<0.01),and root diameter decreased with soil *** soil bulk density was constant,peak pullout force(F)and friction coefficient of root-soil interface(μ)decreased with increasing gravimetric soil moisture content in power *** moisture content significantly affected root pullout resistance because the increase of soil moisture content decreased the friction coefficient between the roots and *** diameter at breakage point(Db)and length of root segment left in soil(Lb)were increased with soil moisture *** addition,peak pullout force of the roots increased in a power function with root diameter at the soil surface(D0)and in a linear function with total root length(L).The results provided an experimental basis for quantifying the effects of soil moisture content on soil reinforcement by plant roots.

关键词： Soil moisture content Peak pullout force Root pullout tests Root reinforcement Root morphology hippophae rhamnoides linn

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