人工固沙区一年生植物小画眉草种群异速生长动态研究  

Allometry Dynamics of Annual Plant Eragrostis poaaeoides in Planted Vegetation for Fixing Sand Dunes

作　　者：张景光[1] 李新荣[1] 王新平[1] 李金贵[1] 赵亮[1] 王刚[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站

出　　处：《中国沙漠》2002年第6期607-611,共5页Journal of Desert Research

基　　金：中国科学院寒区旱区环境与工程研究所知识创新项目 (CACX2 10 0 31;2 10 0 4 8);中国科学院沙坡头沙漠试验研究站开放基金;国家自然科学基金 ( 39970 134 )资助

摘　　要：通过对沙坡头人工固沙区一年生植物 4a的连续观测 ,我们得到对于一年生植物来讲水分竞争是个体分异的根本原因 ,种群中个体间的竞争主要是对有限水分的争夺。随着水分梯度的变化 ,小画眉草种群从一开始的没有竞争到为有限水分而发生的根系竞争。水分条件的暂时好转 ,个体又把大量能量用于建造茎杆、枝叶等支持组织 ,光竞争能力随之加强。发育出较多浅层须根系用于在降雨季节迅速吸收降水是一年生植物非常有利的一个竞争手段。To annuals, soil moisture competition is the radical reason of individual variation, and the rivaling object is still the rare water supply among the individuals. As the change of the moisture gradient, the individual competition among \%Eragrostis poaaeoides\% population also changes, from no competition to root competition for limited water supply. Once there is relatively well moisture condition, the individuals would convert massive energy to supporting tissues such as stems, leaves, etc, which strengthens its competitive abilities for light. A dominant instinct of annuals is that it has many shallow root systems that could absorb rainfall quickly during a rainfall season.

关 键 词：沙坡头地区 一年生植物 异速生长动态 

分 类 号：Q948.121[生物学—植物学]