松嫩平原牛鞭草无性系种群的营养繁殖策略

牛鞭草是典型的无性系禾草，分蘖节和根茎存活时间最多均为２ａ，牛鞭草无性系种群的分蘖割草地仅有１个龄级，在放牧地有２个龄级。放牧地和割草地的根茎均有２个龄级。以潜在种群的数量估计，牛鞭草无性系种群在割草地将保持在单优势种群落中的地位和作用，在牧地有向着单优势种群落演替的潜在趋势。

Vegetative Propagation of Clonal Population of Hemarthria on Songnen Plain of China

Hemarthria japonica is a typical clonal grass. The life-span of both its tillering nodes and rhizome was two years, and hence its tillers on cutting plots belong to a single age class, while those on grazing plots can be identified as in two age classes. The rhizomes of the plant, regardless of the plot uses for cutting or grazing, can be classified into two age classes. The clonal population of H. japonica, estimated by its propagation potential, would be capable of maintaining its unique dominant status in the community on cutting plots and possibly gaining such a status on grazing plots through succession.