人工固沙区一年生植物小画眉草的竞争调节  

Competitive Regulation of Annual Plant Eragrostis poaeoides in Planted Vegetation for Fixing Sand Dunes

作　　者：王兮之[1] 张景光[1] 施溯筠[1] 王刚[1] 

机构地区：[1]兰州大学干旱农业生态国家重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2001年第3期240-243,共4页Journal of Desert Research

基　　金：国家自然科学基金重大项目 (3 9893 3 60 ) ;沙波头沙漠试验研究站基金项目资助

摘　　要：以分布在沙坡头沙漠试验研究站人工固沙植被中的一年生植物小画眉草为例 ,利用定点样方观测种群数量变化和定株测定植株生长的方法 ,研究了荒漠植物中是否存在竞争的问题 ,得到如下初步结论 :①在降水年际变率较大的荒漠生境中 ,当降水相对多时植物个体间表现出明显的竞争作用。②在种群水平上 ,种内竞争的数量调节作用表现为将变化幅度很大的初始密度调节为变化范围很小的终局密度。③在个体水平上 ,竞争制约着可塑生长过程 ,植株平均重量随种群密度的增加而减小。④当种群初始密度大时小画眉草的存活曲线为DeeveyⅢ型 。Ta ki ng the annual plant \%Eragrostis poaeoides\%, which distributes in the planted v egetation for fixing sand dunes of Shapotou Desert Experimental Research Station as an example, the competitive aspect of desert plant was studied, using the in vestigation of abundance changes of plant populations and plant individual growt h in quadrats. The conclusions are as follows: ①Under the desert habitat with g reat fluctuation of annual precipitation between years, the competition among pl ant individuals is obvious when the annual precipitation is greater. ②The func tions of intraspecific competition in population regulation were demonstrated by the reduction of change extent of the population density from beginning to end. ③For the individual plant growth, average individual weight decreases as popul ation density increases due to the effect of intraspecific competition. ④The su rvival curve of \%E. poaeoides\% shows Deevey Ⅲ type, it means that this specie s is a r-strategist.

关 键 词：荒漠生境 小画眉草 竞争作用 人工固沙区 种群数量 一年生植物 

分 类 号：Q948.122.1[生物学—植物学]