不同生境条件下羊草种群无性系和有性生殖特征的比较研究  

Comparative study on clonal and sexual reproductive traits of Leymus chinensis populations in different habitats.

作　　者：王仁忠[1] 

机构地区：[1]中国科学院植物研究所植被数量生态学开放研究实验室,北京100093

出　　处：《应用生态学报》2001年第3期379-383,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金!项目 (39899370 );国家教委跨世纪优秀人才培养计划项目

摘　　要：比较研究了东北草原不同生境条件下 4个羊草种群无性系和有性生殖数量特征的差异 ,结果表明 ,由于各种群所处立地的资源差异 (特别是土壤水分 ) ,导致各种群在无性系 (包括营养枝和根茎芽密度 )和有性生殖 (生殖枝密度、生殖枝分化率、生殖贡献 )等数量特征方面差异显著 ,尤其在低平原种群与沙丘种群之间最为显著 .与沙丘种群相比 ,低平原种群营养枝平均密度高 5 0 % ;根茎芽平均密度高 30 %以上 ;生殖枝密度平均值高 2 0 0 %以上 .The variations of clonal and reproductive traits between four Leymus chinensis populations in different habitats were studied on northeast grasslands of China. The results showed that significant differences existed among Leymus chinensis populations in both clone traits (vegetative shoot densities and tiller densities) and sexual reproduction traits (reproductive shoot densities,reproductive shoot differentiation and reproductive effects),primarily due to the habitat heterogeneity of sites,especially the difference in soil moisture.The difference between grassland population and dune population was relatively greater,and the average vegetative shoot density,tiller density and sexual shoot density from grassland population were 50%,30% and 200% greater than those from dune,respectively.

关 键 词：生境条件 羊草种群 无性系 有性生殖数量特征 

分 类 号：Q948[生物学—植物学]