割草对星星草种群数量特征的影响

目的]为植物种群生殖生态学的深入研究提供理论依据。方法]从种群和无性系水平,对2种生境的星星草营养株数和生殖株数与丛径、总分蘖株数的关系进行定量分析。结果]保护地星星草生殖株数所占比例是割草地的2倍,反映出保护地有利于星星草的生殖生长。保护地星星草的营养株数占总分蘖株数的比例是割草地的0.69倍。无论是保护地还是割草地,星星草无性系的营养株数均随着丛径的增加而增大,割草地的增加速率比保护地大。星星草营养株数和生殖株数与丛径之间呈极显著的直线正相关关系(P0.01)。结论]割草有利于星星草的营养生长和生殖生长。

Effects of Mowing on the Quantity Characteristics of Puccinellia tenuiflora Population

Objective] The research aimed to provide theoretical basis for further study on the reproductive ecology of plant population.Method] From the population and clone aspects,the relationships between the quantity of vegetative ramet,the quantity of reproductive ramet and clone size,total number of tillering plants of Puccinelila tenuiflora in two habitats were quantitively analyzed.Result] The ratio of reproductive ramets of P.tenuiflora in protected field was twice that in mowing field,which reflected that protected field was favorable for the reproductive growth of P.tenuiflora.The ratio of vegetative ramets in total number of tillering plants of P.tenuiflora in protected field was 0.69 times that in mowing field.Whether protected field or mowing field,the quantity of vegetative ramets of P.tenuiflora increased with the increase of clone size and the increasing rate of mowing field was greater than that of protected field.The number of vegetative ramets and the number of reproductive ramets both showed the extremely significant positive linear correlation with the clone size(P<0.01).Conclusion] Mowing was favorable for the vegetative growth and the reproductive growth of P.tenuiflora.