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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.
Root euphoria is one of the most important ways of forest renewal, which is of great significance to the maintenance of population and species diversity.In the natural communities, the influence of topographical factors and evolutionary history on the root abilities of woody plants remains to be studied.In this study, The first survey data of long-term monitoring plots of 25 hm2 evergreen and deciduous broad-leaved mixed forest in Dagongshan aimed to analyze the correlation between root adventitious ability and topographical factors and whether the root adulterant ability has significant lineage signal. ) There were 54184 germplasm adventitious roots and 33 039 individuals with root germination, accounting for 17.71% of the total number of individuals in the sample plots. (2) Torus transplanting test showed that the root adventitious bud ability and elevation, concavity and convexity index were significant Negatively correlated with the topographic wetness index, which may be due to the scouring effect of water flow, strong disturbance in the low-altitude valleys and lower productivity, thus enhancing the root vigor of the species; (3) The root vigor of 126 euphorbia species was obvious but weaker lineage signal.On the different life forms, only the shrub layer and the deciduous plant had significant lineage signals, and the arbor layer, sub-arbor layer and evergreen plant lineage letter Not significant. This shows that the root sprouting ability is an unstable trait in evolutionary history. The results showed that root sprouting ability Badagongshan plot woody plants of the terrain factor and evolutionarily significant influence history.