松嫩平原碱化草甸星星草种群营养繁殖及有性生殖的数量特征

Quantitative characters of vegetative propagation and sexual reproduction of Puccinelliatenuiflora population on alkalized meadow of Songnen Plain.

根据对星星草单优群落独立株丛的大样本取样和对正常花序随机取样的调查与测定，分析了松嫩平原碱化草甸星星草种群的营养繁殖及有性生殖特征．结果表明，星星草种群诸营养繁殖数量性状之间有明显的规律性，丛植株数、丛地上生物量、丛生殖株数及丛生殖株重分别随丛径呈指数形式增加．星星草种群的圆锥花序大多为９—１６个节，花序上各节位上的小穗数量呈γ密度函数分布．随着节位的增高，各节位上的小花数量呈Ｌｏｇｉｓｔｉｃ曲线形式减少．小穗数和小花数均随节位增高呈饱和型指数曲线形式累积增长．

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.