Can root trait diversity explain complementarity effects in a grassland biodiversity experiment?

作     者：Lisette M.Bakker Liesje Mommer Jasper van Ruijven 

作者机构：Plant Ecology and Nature Conservation GroupWageningen University&ResearchDroevendaalsesteeg 3a6708 PB WageningenThe Netherlands 

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

年 卷 期：2018年第11卷第1期

页      面：73-84页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0901[农学-作物学] 0902[农学-园艺学] 0713[理学-生态学] 

基　　金：L.M.is supported by an NWO-Vidi grant(no 864.14.006) This study was supported by the Research School for Socio-Economic and Natural Sciences of the Environment(SENSE),the Netherlands 

主　　题：biodiversity effects resource complementarity trait diversity roots functional diversity grassland 

摘      要：Aims The positive relationship between plant biodiversity and com-munity productivity is well ***,our knowledge about the mechanisms underlying these positive biodiversity effects is still *** of the main hypotheses is that com-plementarity in resource uptake is responsible for the positive biodiversity effects:plant species differ in resource uptake strat-egy,which results in a more complete exploitation of the avail-able resources in space and time when plant species are growing *** studies suggest that functional diversity of the community,*** diversity in functional characteristics(‘traits’)among species,rather than species richness per se,is important for positive biodiversity ***,experimental evidence for specific trait combinations underlying resource complemen-tarity is *** the root system is responsible for the uptake of nutrients and water,we hypothesize that diversity in root traits may underlie complementary resource use and contribute to the biodiversity *** In a common garden experiment,16 grassland species were grown in monoculture,4-species mixtures differing in root trait diversity and 16-species *** 4-species mixtures were designed to cover a gradient in average rooting ***-ground biomass was cut after one growing season and used as a proxy for plant productivity to calculate biodiversity *** Findings Overall,plant mixtures showed a significant increase in biomass and complementarity effects,but this varied greatly between ***,diversity in root traits(measured in a separate greenhouse experiment and based on literature)could not explain this variation in complementarity ***,complementa-rity effects were strongly affected by the presence and competitive interactions of two particular *** large variation in comple-mentarity effects and significant effect of two species emphasizes the importance of community composi