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中国沙漠 ›› 2001, Vol. 21 ›› Issue (3): 240-243.

• 研究论文 • 上一篇    下一篇

人工固沙区一年生植物小画眉草的竞争调节

王兮之1, 张景光1,2, 施溯筠1, 王刚1   

  1. 1. 兰州大学干旱农业生态国家重点实验室, 甘肃兰州 730000;
    2. 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, 甘肃兰州 730000
  • 收稿日期:2000-12-15 修回日期:2001-02-13 出版日期:2001-09-20 发布日期:2001-09-20
  • 通讯作者: 王刚
  • 作者简介:王兮之(1971-),男(汉族),甘肃兰州市人,在读博士生,主要从事景观生态学及植物生态学研究。
  • 基金资助:
    国家自然科学基金重大项目(39893360);沙波头沙漠试验研究站基金项目资助

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

WANG Xi-zhi1, ZHANG Jing-guang1,2, SHI Suo-yun1, WANG Gang1   

  1. 1. State Key Laboratory of Arid Agroecology, Lanzhou University, Lanzhou 730000, China;
    2. Shapotou Desert Research & Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China
  • Received:2000-12-15 Revised:2001-02-13 Online:2001-09-20 Published:2001-09-20

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,表现出较明显的r对策者的特点。

关键词: 荒漠生境, 小画眉草, 竞争调节

Abstract: Ta ki ng the annual plant Eragrostis poaeoides, which distributes in the planted vegetation 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 growth 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 functions 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 population density increases due to the effect of intraspecific competition. ④The survival curve of E. poaeoides shows Deevey Ⅲ type, it means that this specie s is a r-strategist.

Key words: desert habitat, Eragrostis poaeoides, competitive regulation

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