狗牙根根系分布特征及其抗拉强度试验研究

以狗牙根为研究对象,就狗牙根根系在土壤中的分布及其抗拉强度进行了初步研究。结果表明,根系密度及根系重量随土层深度(0—40 cm)的增加而减少,其规律均服从指数函数关系分布;根系抗拉力随直径增大而增大,其分布规律均可用二次函数进行拟合;根系的平均抗拉强度为39.349 MPa,约为Ⅰ级钢筋抗拉强度的17%,能产生显著的根系"加筋作用",抗拉强度随直径增大而减小,其规律服从指数函数关系分布。根据狗牙根根系分布特征及抗拉强度特性,其固土护坡作用较大。

Root Distribution Characteristics and Tensile Strength of Cy nodon Dactylon L.

A preliminary study on the distribution and tensile strength of roots of Cynodon dactylon L.in soil was conducted.The results showed that the density and the weight of root decreased with the increasing soil depth(0.40cm),and the trend could be expressed by exponential function.The tension resistance of the root increased with the enlargement of diameter,and could be modelled by quadratic function.The average tensile strength of the root was 39.349 MPa,and was 17% of that of grade I steel,more over,it decreased with the increase of the diameter,and submitted to the law of exponent ial function.Hence,Cynodon dactylon L.has a significant function in slop protection based on the root distribution characteristics and tensile strength features.