伊犁河谷巨序剪股颖种群构件的年龄结构研究

目的]研究根茎型禾草巨序剪股颖种群构件的年龄结构。方法]通过生长季末期单位面积取样的方法,对新疆伊犁河谷昭苏县境内2个生境的巨序剪股颖种群构件的组成及其年龄结构进行研究。结果]2个样地的巨序剪股颖种群均由营养分蘖株组成,由4个龄级组成,且均呈增长型年龄结构;2个样地的根茎均为5个龄级,其中又以1和2龄根茎占绝对优势。在生长季末期,2个样地的巨序剪股颖潜在种群均由各龄冬性分蘖苗、根茎顶芽、根茎节间芽和各龄分蘖节芽组成,这些芽在潜在种群中占优势地位,各龄级芽又以1龄级的占显著优势,均属于增长型年龄结构。结论]该研究反映出巨序剪股颖无性系的发展方向,也为该种牧草的栽培和管理提供了理论依据。

Study on the Age Structures of Population Modules of Agrostis gigantea in Yily River Valley Area

Objective] The aim was to study the modules' age structures of Agrostis gigantean which is a perennial,rhizomatic and typical clone grass.Method] Components and age structures of modules of A.gigantea populations were studied at the end of growth season in two fifferent habitats in Zhaosu County of the Yily River Valley area in Sinkiang.Result] The populations were both composed by vegetative and reproductive tillers in two habitats.There were four age classes of tillers which showed an increasing age st...