根茎禾草沙鞭的克隆基株及分株种群特征

 在内蒙古沙地站对根茎禾草沙鞭的观测实验发现，沙鞭具有规则的克隆生长、“游击型”克隆构型和相当快的克隆扩展。其地下根茎的寿命至少2年。这些发现指示着该植物种可能具有很强的克隆整合。对内蒙古沙地站和内蒙古草原站的单种沙鞭分株种群的比较和在各站对单种和混交沙鞭分株种群的比较发现，不同地点和在不同群落条件下的沙鞭分株种群在许多重要性状上都存在差异。这些结果暗示着克隆可塑性对沙鞭生态适应性的可能贡献。关于沙鞭克隆整合和克隆可塑性的进一步研究是必要的。

GENET FEATURES AND RAMET POPULATION FEATURES IN THE RHIZOMATOUS GRASS SPECIES PSAMMOCHLOA VILLOSA

Psammochloa villosa at Ordos Sandland Ecological Station (OSES) was investigated. P. villosa plants had a regular clonal growth, a clonal architecture of "guerilla" and a quite fast clonal expansion. The rhizomes connecting the ramets were able to maintain for at least 2 years. The results suggest that there is patential of a strong clonal integration in the species. The ramet populations of the species at OSES and Inner Mongolia Grassland Ecosystem Research Station (IMGERS) and those under conditions of monoculture and mixed with different species were compared. There were considerable variations in some important traits such as rhizome internode length,shoot height,ramet density and biomass between the monospecific populations at OSES versus IMGLES. At each of the two sites, differences in the same traits between monospecific population and population mixed with defferent species were also observed. The results imply that clonal plasticity may have a contribution to ecological adaptation in the species.