沙坡头地区固定沙丘一年生植物小画眉草种群动态研究  

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

作　　者：张景光[1] 李新荣[2] 王新平[2] 王刚[1] 李金贵[2] 王宗灵[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 [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

出　　处：《中国沙漠》2001年第3期232-235,共4页Journal of Desert Research

基　　金：国家重点基础研究规划项目 (G2 0 0 0 0 4870 4) ;中国科学院寒区旱区环境与工程研究所知识创新项目 (CN2 10 0 3 1)资助 ;沙坡头沙漠试验研究站基金 (2 0 0 0 2 5 ) ;国家自然科学基金 (3 9970 13 4 )

摘　　要：通过对一年生草本植物小画眉草 (Eragrostispoaeoides)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。The germination, growth, development and population of \%E. poaeoides\% are stro ngly dependent on the precipitation. The plants germinated group by group and in patches. In 1994, there appeared 4 germinations. Because of the continuous drou ght after the germination, the first young seedlings had died totally sooner. La ter on, since the precipitation increased, their germination, growth, developmen t and natural self-thinning became normal and formed a continuous process. The observed and measured data are the net increment of the process. Water limitatio n and competition of its use between plants must result in population self-thin ning. The C-pattern survival curve of the annuals implies that their life strat egy belongs to r-strategy. r-strategy species appear after occupy the earlier st ages of succession.

关 键 词：沙坡头地区 固定沙丘 种群动态 一年生植物 小画眉草 

分 类 号：Q948.121[生物学—植物学]