Distribution and Mechanical Characteristics of Roots of Slope Protection Plants
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Abstract:
In order to reveal the mechanism of soil reinforcement by herb roots, we selected 4 typical hillslope protection plants, Trifolium repens L, Coronilla varia L, Lolium perenne L and Poa annua L to study the spatial distribution of root length density and tensile properties. The result showed: With the increase of the soil depth, the root length density (RLD) of gramineous plants gradually reduced in the form of exponential function, while the RLD of legumes first increased and then decreased, with a polynomial fitting curve. With the increase of the distance to the stem, RLD of gramineous plants decreased gradually, while RLD of legumes plants increased first and then decreased. In the roots diameter range of 0.1 mm~3 mm, the average tensile resistance of leguminous plants was greater than that of the gramineae plants. Legume’s root tensile resistance and root diameter showed a power function relationship, and the relationship between tensile resistance and diameter of Kentucky bluegrass and ryegrass was exponential function and logarithmic function relationship, respectively. The tensile strength of four species decreased with the increases of root diameter and their stress and strain showed a logarithmic function relationship, which illustrated that their roots were inelastic. At the same diameter, different plants showed variance with stress as ranked: White Clover > Crown vetch > Ryegrass > Kentucky bluegrass. Using the principal component analysis (PCA) to comprehensively analyze the characteristics of the plant to protect the slope, we could conclude that leguminous plants were better than gramineous plants and White Clover was the optimal in the four plants.
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