文献类型：期刊文献

中文题名：Strong restrictions on the trait range of co-occurring species in the newly created riparian zone of the three Gorges Reservoir Area, china

作者：Aiying Zhang[1,2] Will Cornwell[3] Zhaojia Li[1,4] Gaoming Xiong[1] Dayong Fan[1] Zongqiang Xie[1,2]

第一作者：Aiying Zhang

机构：[1]State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;[2]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;[3]Ecology and Evolution Research Centre,School of Biological,Earth and Environmental Science,University of New South Wales,Sydney,NSW 2052,Australia;[4]Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou,510520,China

年份：2019

卷号：12

期号：5

起止页码：825-833

中文期刊名：植物生态学报（英文版）

外文期刊名：Journal of Plant Ecology

收录：Scopus;CSCD:【CSCD2019_2020】；

基金：Chinese Academy of Sciences(KZCX2-XB3-09).

语种：英文

中文关键词：flood-dry-flood;neighbor distance;novel ecosystem;specific leaf area;trait-based approach

分类号：G63

摘要：Aims community assembly links plant traits to particular environmental conditions.Numerous studies have adopted a trait-based approach to understand both community assembly processes and changes in plant functional traits along environmental gradients.In most cases these are long-established,natural or semi-natural environments.However,increasingly human activity has created,and continues to create,a range of new environmental conditions,and under-standing community assembly in these‘novel environments’will be increasingly important.Methods Built in 2006,the three Gorges Dam,largest hydraulic project in china,created a new riparian area of 384 km^(2),with massively al-tered hydrology.this large,newly created ecosystem is an ideal platform for understanding community assembly in a novel environment.We sampled environment variables and plant communities within 103 plots located in both the reservoir riparian zone(RRZ)and adjacent non-flooded and semi-natural upland(Upland)at the three Gorges Reservoir Area.We measured six traits from 168 plant species in order to calculate community-level distribution of trait values.We expected that the altered hydrology in RRZ would have a profound effect on the community assembly process for the local plants.Important Findingsconsistent with previous work on community assembly,the dis-tribution of trait values(range,variance,kurtosis and the standard deviation of the distribution neighbor distances)within all plots was significantly lower than those from random distributions,indicat-ing that both habitat filtering and limiting similarity simultaneously shaped the distributions of traits and the assembly of plant commu-nities.considering the newly created RRZ relative to nearby sites,community assembly was different in two main ways.First,there was a large shift in the mean trait values.compared to Upland commu-nities,plant communities in the RRZ had higher mean specific leaf area(SLA),higher nitrogen per unit leaf mass(Nmass),and lower max-imum height(MH).Second,in the RRZ compared to the Upland,for the percentage of individual plots whose characteristic of trait values was lower than null distributions,the reductions in the community-level range for SLA,Nmass,nitrogen per unit leaf area(Narea)and phos-phorus per unit leaf area(Parea)were much larger,suggesting that the habitat filter in this newly created riparian zone was much stronger compared to longer established semi-natural upland vegetation.this stronger filter,and the restriction to a subset of plants with very similar trait values,has implications for predicting riparian ecosystems’responses to the hydrological alterations and further understanding for human’s effect on plant diversity and plant floras.