松嫩平原光稃茅香无性系种群的营养繁殖特征

光稃茅香是典型的无性系禾草 .分蘖节可繁殖 2个世代 ,最多存活 3个年度 .根茎最多存活 2个年度 .无性系种群的分蘖株和根茎均有 2个龄级 ,并均以 1龄级占较大比重 .无性系潜在种群由冬性苗和根茎芽所组成 .以潜在种群的数量估计 ,在割草场混生群落中将保持现有的地位和作用 ,在放牧场的优势种群落中将增强其地位和作用 .

Vegetative propagation characters of clonal populations of Hierochloe glabra in Songnen Plain.

Hierochloe glabra is a typical clonal grass.Its tiller nodes can propagate two generations.The tiller nodes can survive at most for three years,and the rhizomes for two years.There are two age classes in both tiller and rhizome populations,and the first age class constitutes the majority.The potential clonal populations consist of winterness seedlings of tiller and rhizome buds. It is estimated by the numbers of the potential clonal population that the grass would keep its existing positions and roles in the mixed communities of hay making plots,and would enhance itself as a dominant species in the communities of grazing plots.