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Community-level trait responses and intra-specific trait variability play important roles in driving community productivity in an alpine meadow on the Tibetan Plateau

引用

Journal of Plant Ecology 2017年第4期10卷 592-600页

作者： Wei Li Jie Zhao Howard E.Epstein Guanghua Jing Jimin Cheng Guozhen Du State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University26 Xinong RoadYangling 712100China Institute of Soil and Water Conservation Chinese Academy of Sciences&Ministry of Water Resource26 Xinong RoadYangling 712100China College of Animal Science and Technology Northwest A&F University22 Xinong RoadYangling 712100China Department of Environmental Sciences University of Virginia291 McCormick RoadCharlottesvilleVA 22904-4123USA School of Life Sciences Lanzhou University222 Tianshui RoadLanzhou 730000China

Aims Human activities have dramatically increased nutrient inputs to ecosys-tems,impacting plant community diversity,composition and *** research has shown that a decrease in species diversity and an increase in productivity are a common phenomenon following fertilization in grasslands *** magnitude of the response of species diversity and above-ground net primary productivity(ANPP)to fertilization mainly depends on species traits(mean trait values)and traits variability(plasticity).Our aim of this study was to examine(i)changes of species diversity(species richness and Shannon-Wiener index)and ANPP following fertilization;(ii)which species traits or community-weighted mean(CWM)traits can determine ANPP,as expected from the‘biomass ratio hypothesis’;and(iii)the relative role of intra-specific and inter-specific trait variability in this process following *** We measured ANPP and four key plant functional traits:specific leaf area(SLA),leaf dry matter content(LDMC),mature plant height(MPH)and leaf nitrogen concentration(LNC)for 25 component species along a fertilization gradient in an alpine meadow on the Tibetan *** addition,trait variation of species was assessed using coefficients of variation(CV),and we calculated the ratio of the CVintra to the *** Findings Our results showed that:(i)fertilization significantly reduced species richness and Shannon-Weiner diversity index,but sig-nificantly increased ANPP;(ii)there was a significant positive correlation between ANPP and CWM-SLA and CWM-MPH,yet there was no significant relationship between ANPP and CWM-LNC or CWM-LDMC;(iii)intra-specific variability in SLA and MPH was found to be much greater than inter-specific variability,especially at the higher fertilization *** con-cluded that CWM-SLA and CWM-MPH can be used to assess the impacts of species changes on ecosystem functioning,and dominant species can maximize resource use through intra-spe-

关键词： biomass ratio hypothesis fertilization leaf dry matter content leaf nitrogen concentration mature plant height specific leaf area Tibetan Plateau

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