狗牙根种质资源的根系分布特征及抗拉强度研究

为比较不同狗牙根种质资源的固土护坡能力,研究了不同狗牙根的根系分布特征及抗拉强度,结果表明:狗牙根的根系集中分布在0～10 cm土层,其根长密度和根重密度随土层深度的增加而减少,C2的根长密度和根重密度均优于C1和C3.3份狗牙根材料的平均根直径均小于1.0 mm,C2的有效根密度最大;狗牙根的根系抗拉强度均随根系直径的增加而减小,3份材料的根系最大抗拉强度的峰值均出现在根系直径小于0.4 mm径级,表明细根的固土护坡能力较粗根好,3份材料中C2的根系平均抗拉强度最大.从3份狗牙根材料中初步筛选出较适宜做护坡的狗牙根为C2.

Study on root distribution characteristics and tensile strength of bermudagrass germplasm

In order to compare the slope stability of different bermudagrass resources, the root distribution characteristics and tensile strength of different bermudagrass varieties were studied. The results showed the roots of bermudagrass were concentrated in the 0-10 cm soil layer. The root length density and root weight density decreased with soil depth increasing. C2 was better than C1 and C3 in root length density and root weight density. The root diameters ofthese bermudagrass were less than 1.0 mm and C2 had the biggest value of effective root density. The root tensile strengthdecreased with root diameter increasing. The biggest root tensile strength was existed in the roots diameter less than 0.4mm which showed the slope stability of fine roots were better than that of coarse roots. The root tensile strength of C2 was the best in these three bermudagrass. After preliminary screening, C2 is more suitable for slope protection than C1 and C3.