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中国沙漠 ›› 2001, Vol. 21 ›› Issue (3): 232-235.

• 研究论文 • 上一篇    下一篇

沙坡头地区固定沙丘一年生植物小画眉草种群动态研究

张景光1,2, 李新荣2, 王新平2, 王刚1,2, 李金贵2, 王宗灵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:2001-01-06 修回日期:2001-03-06 出版日期:2001-09-20 发布日期:2001-09-20
  • 作者简介:张景光(1971-),男(汉族),甘肃武威人,主要从事干旱区生态学研究。
  • 基金资助:
    国家重点基础研究规划项目(G2000048704);中国科学院寒区旱区环境与工程研究所知识创新项目(CN210031)资助;沙坡头沙漠试验研究站基金(200025);国家自然科学基金(39970134)

Population Dynamic of Annual Plant Eragrostis poaeoides in Fixed Sand Dune in Shapotou Area

ZHANG Jing-guang1,2, LI Xin-rong2, WANG Xin-ping2, WANG Gang1,2, LI Jin-gui2, WANG Zong-Ling1   

  1. 1. The State Key Lab. 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:2001-01-06 Revised:2001-03-06 Online:2001-09-20 Published:2001-09-20

摘要: 通过对一年生草本植物小画眉草(Eragrostis poaeoides)种群动态的研究,可以看到小画眉草的萌发和生长以及数量动态对于降水的强烈依赖,使得草本植物的萌发具有成批性,小画眉草有4批出苗。开始出苗后由于连日高温干旱,致使第一批苗全部死亡。之后,由于降水较多且相对较集中,出苗、生长发育与自疏死亡成连续过程,观察到的是其净结果。由于水分对种群的制约,种群间对水分的竞争必然导致自疏现象。一年生草本植物的存活曲线属于C型,生活史对策明显表现为r-对策。r-对策种群往往出现在群落演替的早期阶段。

关键词: 沙坡头地区, 固定沙丘, 种群动态

Abstract: The germination, growth, development and population of E. poaeoides are strongly dependent on the precipitation. The plants germinated group by group and in patches. In 1994, there appeared 4 germinations. Because of the continuous drought after the germination, the first young seedlings had died totally sooner. Later on, since the precipitation increased, their germination, growth, development and natural self-thinning became normal and formed a continuous process. The observed and measured data are the net increment of the process. Water limitation and competition of its use between plants must result in population self-thinning. The C-pattern survival curve of the annuals implies that their life strategy belongs to r-strategy. r-strategy species appear after occupy the earlier st ages of succession.

Key words: Shapotou region, fixed dunes, population dynamics

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