寒旱环境草本植物根系护坡的时间尺度效应  

Time scale effect of herb roots on slope protection in a cold,arid and semi-arid environment

作　　者：张兴玲[1] 胡夏嵩[1,2] 李国荣[1] 朱海丽[1] 毛小青[1] 宋芊[1] 陈桂琛[2] 

机构地区：[1]青海大学,西宁810016 [2]中国科学院西北高原生物研究所,西宁810008

出　　处：《水文地质工程地质》2009年第4期117-120,共4页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金资助项目(40762002);中国博士后科学基金资助项目(20060390306);青海省重点科技攻关项目(2003-N-134);教育部“新世纪优秀人才支持计划”资助项目(NCET-04-G983)联合资助

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。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.

关 键 词：草本植物 根系 植物护坡 时间尺度效应 边坡 

分 类 号：TU413[建筑科学—岩土工程]