北京师范大学学报（自然科学版）2016，Vol.52Issue(3)：277-282,6.DOI:10.16360/j.cnki.jbnuns.2016.03.005
柽柳根系构型对干旱的适应策略
Adaptive strategy of Tamarix spp root architecture in arid environment
摘要
Abstract
The root architecture of Tamarix spp in the lower reaches of the Tarim River was analyzed to investigate ecological adaptation strategies of Tamarix spp during drought.Root topological architecture showed two branch patterns:dichotomous branching in four-year-old and fishtail branching in one-year-old forests.Root topological index of one-year-old Tamarix spp far away from water was larger,simpler than those closer to water,therefore one-year-old Tamarix spp reduces root branch after adaptation to drought. Drought promotes root elongation in one-year-old Tamarix spp Low branching rate was a major branching characteristics of Tamarix spp There was significant difference in branching rates between one-and four-year-old Tamarix spp.The lower main root branch and larger gradual branching rate contribute to high efficiency of resource utilization,promote down-growth of main root.For four-year-old Tamarix spp ,branches of main root were abundant and gradual branching rate showed a decreasing trend with decreased root grade,this will help to provide resources and avoid overlapping and resource competition among roots.关键词
根系构型/适应策略/拓扑指数/连接长度/分支率Key words
root architecture/adaptive strategies/topological index/link length/branching rate分类
农业科技引用本文复制引用
何广志,陈亚宁,陈亚鹏,王日照..柽柳根系构型对干旱的适应策略[J].北京师范大学学报（自然科学版）,2016,52(3):277-282,6.基金项目
国家支撑计划课题资助项目(2014BAC15B02) （2014BAC15B02）
国家自然科学基金资助项目(41371515) （41371515）
