刺五加种群更新机理的初步研究

Preliminary Study on Regeneration Mechanism of Acanthopanax senticosus Population

对不同生境刺五加种群的年龄结构和更新机制进行了初步研究。结果表明:蒙古栎林下的刺五加种群结构处于稳定状态,而针阔混交林和次生杂木林刺五加的种群结构处于衰退状态。不同样地刺五加的有性生殖和营养繁殖具有一定的差异,在郁闭度为40%的蒙古栎林,其有性生殖的坐果率为51.99%、饱满种子成熟率为31.20%,远远大于针阔混交林和次生杂木林。刺五加营养繁殖的效率与环境的郁闭度、群落间隙大小有关,在针阔混交林和次生杂木林,刺五加每一无性系的株数较少、株间距较大,而在蒙古栎林下,每一无性系的株数较多、株间距较小,这说明光照充足有利于刺五加的营养繁殖。

Age structure and regeneration mechanism of Acanthopanax senticosus population were researched in different ecological environments. The result showed that A. senticosus population was in a stable state in Quercus Mongolica forest, but in a decline state in Theropencedrymion forest or in secondary miscellaneous forest. The sexual and vegetative reproductions of A. senticosus population were different in different ecological environments. The mean fruit setting ratio was 51.99% and plump seed ratio per inflorescence was 31.20% in Q. Mongol＆a, which were higher than those of Thempencedrymlon and secondary miscellaneous forest. The vegetative reproduction was related with canopy density and community gap. The number of clonal A. Senticosus was low and the individual interspace was big in Theropencedrymion forest and in secondary miscellaneous forest, and the number of clonal A. Senticosus was higher and the individual interspace was smaller in Q. Mongolica forest, which showed that enough illumination was favorable to vegetative reproduction.