不同利用方式对羊草繁殖特性的影响及其草地更新的分析

Effects of Different Utilization Methods on Reproductive Charcters of Aneurolepidi- um chinense,

通过对典型群落的调查与测定，分析了松嫩平原不同利用方式对羊草种群繁殖特性的影响以及羊草草地持续更新的生物学机理。羊草种群的有性繁殖力较低，在长期连年割草地和过度放牧地，羊草种群的抽穗率没有明显差异。放牧地羊草穗的数量性状和籽实千粒重均不同程度地高于割草地，但结实率和籽实产量则明显低于割草地。与休闲地相比，放牧和割草均可促进羊草种群的营养繁殖力。割草可促进冬性植株形成的数量。综合分析的结果表明，羊草种群主要以营养繁殖来维持种群的自然更新，并可在适宜的条件下保持其单优群落长久不变。

By investigation and measurement in the typis communities in the Songnen Plain of Chi-na,effects of different utilization Methods reproductive characters of Aneurolepidium chinense population and the biological mechnism on persistence renovation of the grass- land were analysed in this paper.Sexual reproductivity was in A. chinense population.Vegetative propagation of A. chinense population could be promoted by grazing and cut-ting.A. chinense population could keep natural renovation by vegetative propagation.