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Interspecific and intraspecific variation in specific root length drives aboveground biodiversity effects in young experimental forest stands

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Journal of Plant Ecology 2017年第1期10卷 158-169页

作者： Wensheng Bu Bernhard Schmid Xiaojuan Liu Ying Li Werner Härdtle Goddert von Oheimb Yu Liang Zhenkai Sun Yuanyuan Huang Helge Bruelheide Keping Ma State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China College of Forestry Jiangxi Agricultural UniversityNanchang 330045China Department of Evolutionary Biology and Environmental Studies University of ZürichWinterthurerstr.190Zürich 8057Switzerland Institute of Ecology Leuphana University LüneburgScharnhorststr.1Lüneburg 21335Germany Institute of General Ecology and Environmental Protection Technische Universität DresdenPienner Str.7Tharandt 01737Germany Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle-WittenbergAm Kirchtor 1Halle 06120Germany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig DeutscherPlatz 5eLeipzig 04103Germany

Aims Although the net biodiversity effect(NE)can be statistically partitioned into complementarity and selection effects(CE and SE),there are different underlying mechanisms that can cause a certain *** objective was to assess the role of resource partitioning and species interactions as two important mechanisms that can bring about CEs by interspecific and intraspecific trait *** We measured tree height of 2493 living individuals in 57 plots and specific root length(SRL)on first-order roots of 368 of these individuals across different species richness levels(1,2,4,8 species)in a large-scale forest biodiversity and ecosystem functioning experiment in subtropical China(BEF-China)established in *** describe the effects of resource partitioning between species by a fixed component of interspecific functional diversity(RaoQ)and further effects of species interactions by variable components of interspecific and intraspecific functional diversity(community weighted trait similarity and trait dissimilarity,CWS and CWD).Finally,we examined the relationships between biodiversity effects on stand-level tree height and functional diversity(RaoQ,CWS and CWD)in SRL using linear regression and assessed the relative importance of these three components of functional diversity in explaining the diversity *** Findings Our results show that species richness significantly affected SRL in five and tree height in ten out of 16 species.A positive NE was generally brought about by a positive CE on stand-level tree height and related to high values of RaoQ and CWS in SRL.A positive CE was related to high values of all three components of root functional diversity(RaoQ,CWS and CWD).Our study suggests that both resource partitioning and species interactions are the underlying mechanisms of biodiversity effects on stand-level tree growth in subtropical forest.

关键词： aboveground complementarity effects belowground resource partitioning biodiversity and ecosystem functioning species interactions tree height

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