中文摘要：

根萌是森林更新的重要方式之一,对种群和物种多样性的维持具有重要意义.在自然群落中,地形因子以及进化历史对木本植物根萌能力的影响仍有待研究.本研究利用八大公山25 hm2常绿落叶阔叶混交林长期监测样地第一次调查数据,旨在分析根萌能力与地形因子的相关性,以及根萌能力是否具有显著的谱系信号.研究发现：（1）样地根萌总数为54184棵,具根萌现象的个体33039棵,占样地总个体数的17.71%;（2）Torus转换检验表明根萌能力与海拔、凹凸度、干旱度指数呈显著的负相关,与地形湿润指数呈显著的正相关.这可能是由于水流的冲刷作用,低海拔的沟谷内受干扰较强,生产力较低,因而增强了物种的根萌能力;（3）样地常见的126个根萌物种的根萌能力有显著但较弱的谱系信号.在不同生活型中,只有灌木层和落叶植物具有显著的谱系信号,乔木层、亚乔木层和常绿植物谱系信号不显著.这说明根萌能力在进化历史中是一个不稳定的性状.结果表明,八大公山样地木本植物的根萌能力受地形因子以及进化历史的显著影响.

英文摘要：

As an important way for forest regeneration, root-sprouting plays an important role in maintaining population and species diversity. Using the initial census data of Badagongshan 25-hm2 forest plot, we analyzed the relationship between root-sprouting ability and topographic factors, and tested the phylogenetic signal of root-sprouting ability. We found that there are 33039 individuals with root-sprouts which account for 17.70% of all the individuals and the total number of root-sprouts was 54184. Results of Spearman’s correlation analyses with torus-translation tests showed that the root-sprouting ability significantly negatively correlated with elevation, convex, and vertical distance from channel network. However it significantly positively correlated with topographic wetness index. These may be due to that the low valley areas were disturbed by the stream flow, thus accelerating the root-sprouting ability. The root-sprouting ability of 126 common species showed significant phylogenetic signal. It showed significant phylogenetic signal for shrub species and deciduous species but not for canopy species, sub-canopy species and evergreen species in different life forms. These suggested that root-sprouting ability was a very unstable functional trait in the evolutionary history. In conclusion, the root-sprouting ability of ligneous plants at Badagongshan plot was influenced by topographic factors and phylogenetic history.