松嫩平原寸草苔无性系种群分株的结构

Structure of ramets in clonal population of Carex duriuscula on Songnen plain of China

寸草苔是典型的无性系植物 ,天然种群主要依靠营养繁殖补充更新。在松嫩平原 ,无性系种群中经常有两个世代的分株共存 ,分蘖节最多可生活 5～ 6个年度。不同生长条件下均以1、2龄级分株的生长最为旺盛 ;1、2龄级分株在种群中占有绝对优势的地位 ;1龄级分株对种群的有性生殖贡献最大。营养分株和生殖分株的重量均具有较大的生态可塑性 ,而生殖分配的生态可塑性较小 。

Carex duriuscula is a typical clonal herbaceous plant which population is maintained mainly through vegetative propagation. On the Songnen Plain the population of the species usually consists of two generations of ramets. Their tiller nodes can live for 5 or 6 years. In most of the habitats, the ramets in the 1st and 2nd age classes are predominant in the population and luxuriate. Ramets in the 1st age class contribute the most to sexual reproduction of the population. The weight of both vegetative and reproductive ramets appears ecologically plastic to a relatively high extent, while the reproductive allocation remains relatively stable.