亚热带天然林4种树木细根生物量垂直分布和主要功能性状的差异

在江西大岗山常绿阔叶混交林中,采用土钻法,对不同树龄的刨花楠、山矾、山乌桕和油桐的细根生物量及其功能性状进行测定;运用多元方差分析方法,分析树种和树龄对细根垂直分布和功能性状的影响。结果表明:4个树种的树龄对细根的生物量的垂直分布没有显著影响,细根生物量随土壤深度的增加而减小;4种树木细根单位面积的生物量和比根长等功能性状有显著差异,但土壤深度对不同细根功能性状的影响不显著;树龄对山乌桕的比根长和组织密度有显著的影响,树龄对油桐的细根直径、表面积和组织密度有显著的影响。

Biomass Vertical Distribution of Fine Root and Its Traits of Four Tree Species in Subtropical Natural Forest

We studied the fine root biomass in four soil depth and other traits of four tree species of Machilus pauhoi, Symplocos sumuntia, Sapium discolor and Vernicia fordii by using soil core method , and investigated the effects of species and tree age on biomass and traits in Dagangshan Mountain of Jiangxi Province .By multiple ANOVA, we detected the variation among traits and species , age and soil depth .Tree age had no significant influence on the distribution of fine root biomass , and fine root biomass per area of four tree species declined with the increase of the soil depth .Species identity influenced fine root biomass and traits significantly;however, soil depth did not have significant effects on fine root traits for four species . Tree age significantly affected specific root length (SRL) and tissue density of Sapium discolor, and fine root diameter, surface and tissue density of Vernicia fordii, respectively .