松嫩平原野古草无性系种群的营养繁殖特征

野古草是典型的无怀系禾草，分蘖节存活时间最多为４ａ。割草场和放牧场野古草无性系种群的分蘖株为增长型的年龄结构；放牧能增加２、３龄分蘖株的形成与存活；野古草无性系种群１龄级分蘖株的生产力明显高于２龄级；割草场和放牧场的野古草无性系潜在种群均于增长的年龄结构。以硌潜在种群的数量估计，割草场将保护翌年群落的优势种地位和作用；放牧场具有向优势和演替的潜在趋势。

Propagation of Arundinella hirta Clonal Population in Songnen Plain of China

Arundinella hirta is a typical clonal grass which possesses tillering nodes that can live as long as 4 years. It was observed that the grass in either the pasture for cutting use or grazing grew with an age structure of expanding type, and it appeared that grazing could promote the formation and development of tillers of the 2nd and the 3rd age classes. The productivity of the 1st-class tillers was obviously higher than that of the 2nd-class. The population of A. hirta, judged by its expanding potential, would maintain its role as a dominant population in the plant community on the pasture for cutting use, while on the pasture under grazing it would become a dominant species.