Abstract: Through investigation and measurement of large samples from independent tufts and random samples from normal spikes in a single dominant community, the quantitative characters of sexual reproduction and vegetative propagation of Puccinellia tenuiflora populationon alkalized meadow of Songnen Plain are analysed.The results show that there is an obvious regularity between quantitative characters of vegetative propagation of the population.The plant number.aboveground biomass, and number and weight of sexual plant ofthe tuft are increased exponentially with its increasing sizes.Most tapering spikes of thepopulation have 9 to 16 nodes.The number of spikelets on each node shows a γ-distributionof density, and that of florets shows a Logistic decrease with increasing number ofnode.The numbers of spikelets and florets both show an exponential growth with increasing number of node.

Key words: Puccinellia tenuiflora, Vegetative propagation, Sexual reproduction, Quantitative character