Enhanced allelopathy and competitive ability of invasive plant Solidago canadensis in its introduced range  

作　　者：Yongge Yuan Bing Wang Shanshan Zhang Jianjun Tang Cong Tu Shuijin Hu Jean W.H.Yong Xin Chen 

机构地区：[1]College of Life Sciences,Zhejiang University,Hangzhou 310058,China [2]Department of Plant Pathogen,North Carolina State University,Raleigh,NC 27695,USA [3]Singapore University of Technology and Design,279623 Singapore [4]Yunnan Academy of Forestry,Kunming 650200,China

出　　处：《Journal of Plant Ecology》2013年第3期253-263,共11页植物生态学报（英文版）

基　　金：This study was supported by Zhejiang Provincial Natural Science Foundation of China(No.Z5090089);the Research Fund for the Doctoral Program of Higher Education of China(RFDP,No.20110101110077).

摘　　要：Aims Why invasive plants are more competitive in their introduced range than native range is still an unanswered question in plant invasion ecology.Here,we used the model invasive plant Solidago canaden-sis to test a hypothesis that enhanced production of allelopathic compounds results in greater competitive ability of invasive plants in the invaded range rather than in the native range.We also exam-ined the degree to which the allelopathy contributes increased com-petitive ability of S.canadensis in the invaded range.Methods We compared allelochemical production by S.canadensis growing in its native area(the USA)and invaded area(China)and also by populations that were collected from the two countries and grown together in a'common garden'greenhouse experiment.We also tested the allelopathic effects of S.canadensis collected from either the USA or China on the germination of Kummerowia striata(a native plant in China).Finally,we conducted a common garden,greenhouse experiment in which K.striata was grown in monocul-ture or with S.canadensis from the USA or China to test the effects of allopathy on plant-plant competition with suitable controls such as adding activated carbon to the soil to absorb the allelochemicals and thereby eliminating any corresponding allopathic effects.Important findings Allelochemical contents(total phenolics,total flavones and total saponins)and allelopathic effects were greater in S.canadensis sampled from China than those from the USA as demonstrated in a field survey and a common garden experiment.Inhibition of K.stri-ata germination using S.canadensis extracts or previously grown in soil was greater using samples from China than from the USA.The competitive ability of S.canadensis against K.striata was also greater for plants originating from China than those from the USA.Allelopathy could explain about 46%of the difference.These find-ings demonstrated that S.canadensis has evolved to be more allelo-pathic and competitive in the introduced range and that allelopathy significantly con

关 键 词：ALLELOPATHY biogeographical approach common garden experiment COMPETITION invasion speciesreceived 

分 类 号：F42[经济管理—产业经济]