Study On Influence Factors Of Root Tensile Properties By Four Arbor Root System

Root tensile properties of vegetation are very important to slope stability. To explore the basic properties of plant roots and influencing factors, we selected Pinus tabuliformis, Larix principis-rupprechtii, Betula platyphylla, Quercus mongolica as our experimental species, through root tensile test indoors and principal component analysis test, we studied effect mechanism of different factors on four species root, multiple regression was used to investigate the relationship between root tensile properties and the influencing factors. The main results of this article are as follows:(1) Root diameter had a significantly positive correlation with root tensile resistance of four species and their relation accorded with the power function, but no correlation could be observed between tensile strength and root diameter. The root tensile resistance and tensile strength, average root tensile resistance and tensile strength of the four species at the same root diameter descended as Betula platyphylla> Quercus mongolica> Pinus tabuliformis> Larix principis-rupprechtii; The root tensile resistance and tensile strength of the four species at different tensile rates descended as 200 mm/min< 100 mm/min< 10 mm/min; The root tensile resistance and tensile strength of the four species at different gauge lengths followed a descending order as 200 mm< 150 mm< 100 mm< 50 mm.(2)The root diameter was the main factor affecting the tensile resistance, followed by the species, again the gauge length, the minimum was tensile rate; Species was the main factor affecting the tensile strength, followed by the gauge length, the minimum was tensile rate. Root diameter had a significantly positive correlation with root tensile resistance, the gauge length and tensile rate had a significantly negative correlation with root tensile resistance and tensile strength.(3) Root moisture content had a significant impact on root tensile resistance and tensile strength of Pinus tabuliformis and Larix principis-rupprechtii; Root moisture content had a significantly negative correlations with root tensile resistance and tensile strength under diameter class 1-6; Root moisture content had a significant impact on root mean tensile resistance and tensile strength, the root mean tensile resistance and tensile strength increased in the first after the law with the decrease in diameter, basically the root tensile properties of two species were best performed when Pinus tabuliformis roots at a moisture content of 37%-45% and Larix principis-rupprechtii roots at a moisture content of 20.4%～28.05%.(4) Cellulose content, hemicelluloses content and holocellulose contnet had a significantly positive correlation with root diameter and tensile resistance of Pinus tabuliformis and Larix principis-rupprechtii, but no correlation could be observed with tensile strength; Cellulose content, hemicelluloses content and holocellulose contnet had a significantly negative correlation with root diameter and tensile resistance of Betula platyphylla and Quercus mongolica, also had a significantly positive correlation with root tensile strength. Lignin content and L/C had a significantly negative correlation with root diameter and tensile resistance of Pinus tabuliformis and Larix principis-rupprechtii, but no correlation could be observed with tensile strength; Lignin content and L/C had a significantly positive correlation with root diameter and tensile resistance of Betula platyphylla and Quercus mongolica, also had a significantly negative correlation with root tensile strength.(5) Root tensile resistance had a significantly positive correlation with diameter, L/C and holocellulose of Pinus tabuliformis and Larix principis-rupprechtii, tensile strength had no significant correlation with main chemical components. Root tensile resistance had a significantly positive correlation with diameter and L/C, also had a significantly negative correlation with lignin of Betula platyphylla and Quercus mongolica, tensile strength had a significantly positive correlation with holocellulose.