中文摘要：

为研究植物护坡效应的可持续性,选取芨芨草、细茎冰草、垂穗披碱草、赖草4种草本植物,分别对生长时间为1-4年的上述草本进行了野外现场拉拔试验。试验结果表明：4种草本其平均抗拔力、平均须根数、平均根径和平均根长随生长时间的增加,均呈增加趋势。芨芨草的平均抗拔力与生长时间之间存在显著幂函数关系,垂穗披碱草、细茎冰草和赖草之间均存在指数函数关系;4种草本的平均须根数与生长时间之间均存在较显著的对数函数关系;芨芨草的平均根径与生长时间之间呈显著的幂函数关系,垂穗披碱草和细茎冰草之间均呈指数函数关系,赖草的根径与生长时间之间呈对数函数关系;芨芨草的平均根长与生长时间之间呈显著的对数函数关系,细茎冰草和赖草之间均呈线性函数关系,垂穗披碱草的平均根长与生长时间之间呈幂函数关系。

英文摘要：

To study the persistence of slope protection effect, in situ pull-out test was conducted to test four herbs of one-year-old to four-year-old： Achnatherum splendens, Agropyron trachycaulum, Elymus nutans, Leymus secalinus. The results indicate that the average pull-resistance, root fibril quantity, root diameter and root length increase with the time of growth. There exist the following relations： a power relation between average pull- resistance and time of growth for Achnatherum splendens, a exponential relation for Agropyron trachycaulum, Elymus nutans and Leymus secalinus, a logarithm relation between average root fibril quantity and time of growth for four herbs, a power relation between average root diameter and time of growth for Achnatherum splendens, and a logarithm relation for Elymus nutans and Agropyron trachycaulum, and for Leymus secalinus. There exists a logarithm relation between average root length and the time of growth, a linear relation for Agropyron trachycaulum and Leymus secalinus and a power relation for Elymus nutans.