密度对结缕草无性系构件生长的影响

摘要

以克隆植物结缕草为研究对象,在试验园内设置了低、中、高3个密度梯度,在生长季末调查了不同密度下结缕草无性系构件匍匐茎和分蘖的相关指标.结果表明,随着密度的降低,结缕草单株产生的匍匐茎数量增加、匍匐茎分枝结构变得复杂,匍匐茎总长度、节间长度和节数增加；低密度下分蘖数量明显增多,分别达到高密度、中密度处理的19倍和3倍.因此,结缕草无性系构件在不同密度下采取了不同的适应对策,低密度下迅速占领空间,高密度下则减缓生长,以降低种内构件间的竞争.%Three density levels were used in experimental garden to study the responses of Zoysia japonica.The growth indexes of modules were measured at the end of growth season.The results showed that the number,total length,internode length and node number of stolon increased and branching structure became complicated under low density.Tillers number in low density was 19 times of that in high density and was 3 times of that in medium density.The growth pattern of modules had different strategy under different densities.Zoysia japonica could grow very fast to occupy resources in low density population and grow slowly in high density population to avoid competition.