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Community‐wide trait means and variations affect biomass in a biodiversity experiment with tree seedlings
Oikos ( IF 3.4 ) Pub Date : 2020-02-10 , DOI: 10.1111/oik.07273
Shan Luo 1 , Bernhard Schmid 2 , Cameron Wagg 3 , Yuxin Chen 1 , Bin Jiang 1 , Minxia Liang 1 , Xubing Liu 1 , Shixiao Yu 1
Affiliation  

The structure of a plant community in terms of functional traits can strongly affect community productivity. Two components may contribute to this, community‐wide trait means (mass‐ratio hypothesis) or community‐wide trait variations (diversity hypothesis) across species and individuals. We compared the explanatory power of the two hypotheses for explaining biomass variation among individuals and communities as measures of productivity. We set up experimental communities of tree seedlings that ranged in species richness from 1 to 8. We measured above‐ and belowground biomass, leaf area, specific leaf area and height of all individuals separately after 16 months of growth and calculated species‐level values by averaging across all individuals of each species grown in monoculture. Using species‐ and individual‐level trait data, we calculated community‐ (CWM) and neighbourhood‐weighted mean (NWM) values to assess the mass‐ratio hypothesis and community functional dissimilarity (FD) and average trait dissimilarity of target individuals to neighbours (ATD), i.e. trait variations, to assess the diversity hypothesis. CWMs explained much more variation in community biomass than did species richness or FD, supporting the mass‐ratio hypothesis. The explanatory power of CWMs increased when calculated with individual‐level data, demonstrating positive effects of trait adjustments of individuals in response to species richness, i.e. plasticity in the broad sense. FD calculated with individual‐level data also increased community biomass, lending some support to the diversity hypothesis. The effects of trait means and variations on community biomass were related to effects of trait means and variations on the biomass of individuals. Overall, our results suggest that trait means rather than trait variations may drive community biomass productivity at the earliest stage of forest development.

中文翻译:

社区范围内的特征手段和变异影响树木幼苗生物多样性实验中的生物量

就功能性状而言,植物群落的结构会严重影响群落生产力。可能有两个因素对此造成影响,即跨物种和个体的全社区性状均值(质量比假设)或全社区性状变异(多样性假设)。我们比较了两个假设的解释力,以解释个体和社区之间的生物量变化作为生产力的度量。我们建立了树木幼苗的实验群落,其物种丰富度从1到8。我们在生长16个月后分别测量了地上和地下生物量,叶面积,比叶面积和所有个体的身高,并通过在单一养殖中生长的每个物种的所有个体的平均数。利用物种和个体水平的特征数据,我们计算了社区(CWM)和邻域加权均值(NWM)值,以评估目标个体与邻居之间的总体比率假设和社区功能差异(FD)和平均特征差异(ATD),即特征变异,以评估多样性假设。与物种丰富度或FD相比,CWM解释了群落生物量的更多变化,从而支持了质量比例假说。用个体水平的数据计算时,CWM的解释能力增强,表明个体性状调整对物种丰富性(即广义上的可塑性)的响应具有积极作用。使用个人水平数据计算的FD也增加了社区生物量,为多样性假设提供了支持。特质均值和变异对群落生物量的影响与特质均值和变异对个体生物量的影响有关。总体而言,我们的结果表明,在森林开发的最早阶段,特征手段而非特征变异可能会驱动社区生物量生产力。
更新日期:2020-02-10
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