短穗兔耳草基株大小对其克隆生长特征的影响

Effects of dry weight of Lagotis brachystachya genet on its clonal growth

对采自青藏高原5个不同海拔高度上的短穗兔儿草基株干重与匍匐茎数量、单位长度匍匐茎干重和无性系分株干重之间的相关性,以及匍匐茎与无性系分株总干重与基株干重的比值进行了分析。结果表明,除人为干扰比较严重的生境外,基株大小与匍匐茎数量、单位长度匍匐茎干重之间存在极显著的正线形相关(P<0.01),基株大小对分株的影响可能与匍匐茎数量有关;匍匐茎与分株总干重与基株干重的比值在海拔最高和最低两个样地中最大。短穗兔儿草基株干重对克隆生长有明显的影响,但在不同海拔高度影响作用的大小和方式表现出一定的差异。

The correlations of the dry weight of genet and the number and the dry weight of stolon, the dry weight of ramet, as well as the ratios of dry weight of stolon and ramet/dry weight of genet of L. brachystachya have been analyzed based on the samples collected from 5 plots at different altitudes on the Qinghai-Xizang Plateau. The results show that except the habitats affected by human activities, there was a significant linear correlation between dry weight of genet and the number of stolon, the dry weight of stolon per cm （P〈0.01）. However, the dry weight of genet does not affect the dry weight of ramet directly. The ratios of the dry weight of stolon and ramet/the dry weight of genet in plot 1 （the highest altitude） and 5 （the lowest altitude） are the highest, Dry weight of L. brachystachya has an significant effect on its clonal growth, this effect varys with altitude.