Positive effects of tree species richness on fine-root production in a subtropical forest in SE-China

作     者：Zhenkai Sun Xiaojuan Liu Bernhard Schmid Helge Bruelheide Wensheng Bu Keping Ma 

作者机构：State Key Laboratory of Vegetation and Environmental ChangeInstitute of BotanyChinese Academy of Sciences20 NanxincunXiangshanBeijing 100093China College of Life SciencesUniversity of Chinese Academy of SciencesNo.19 Yuquan RoadShijingshan DistrictBeijing 100049China Department of Evolutionary Biology and Environmental StudiesUniversity of ZürichWinterthurerstr.1908057 ZürichSwitzerland Institute of Biology/Geobotany and Botanical GardenMartin Luther University Halle WittenbergAm Kirchtor 106120 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-LeipzigDeutscher Platz 5e04103 LeipzigGermany 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2017年第10卷第1期

页      面：146-157页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：the general support of the whole BEF-China team the Sino-German Centre for Research Promotion in Beijing for travel grants and the participation in a summer school on scientific writing(GZ 785) funded by grants from the National Natural Science Foundation of China(No.31270496 and No.31300353) 

主　　题：Biodiversity fine-root biomass fine-root regrowth niche complementarity over-yielding 

摘      要：Aims Fine roots play an important role in the biogeochemical cycles of terrestrial ecosystems and are vital for understanding forest ecosystem functioning and *** plant species diversity has been largely reported to increase aboveground community biomass,but how biodiversity affects fine-root production and the related mechanisms in forests remain *** this study,we aim to answer two questions:(i)does fine-root production increase with tree species richness?(ii)Can this effect be explained by niche complementarity among species?Methods We analyzed data from a large forest biodiversity experiment(BEF-China)with 5-year-old ***-root growth was measured as standing biomass and annual fine-root regrowth was estimated using ingrowth ***,relative yield was calculated to test whether over-or under-yielding occurred when mixtures were compared with the average monoculture of the species included in the *** calculated functional diversity for fine-root(≤2 mm in diameter)traits by Rao’s quadratic entropy index for each species *** effects of manipulated tree species richness and identity on fine-root traits were analyzed with linear mixed-effects *** models were also used to test the relationships between tree species richness and fine-root standing biomass,annual regrowth and vertical *** Findings Fine roots of more than one species were found in half of the soil cores in mixtures indicating that belowground interactions in these young forest stands occurred much earlier than canopy *** found significant differences among species in fine-root traits such as diameter and specific root length(SRL),which suggested different resource-use strategies and niche partitioning among *** fine-root diameter of species ranged from 0.31 to 0.74 mm,mean SRL ranged from 12.43 m·g^(−1)to 70.22 m·g^(−1)and mean vertical distribution indexβranged from 0.68 to *** was a significant positive re