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

Journal of Plant Ecology 2013年第3期6卷 253-263页

作者： Yongge Yuan Bing Wang Shanshan Zhang Jianjun Tang Cong Tu Shuijin Hu Jean W.H.Yong Xin Chen College of Life Sciences Zhejiang UniversityHangzhou 310058China Department of Plant Pathogen North Carolina State UniversityRaleighNC 27695USA Singapore University of Technology and Design 279623 Singapore Yunnan Academy of Forestry Kunming 650200China

Aims Why invasive plants are more competitive in their introduced range than native range is still an unanswered question in plant invasion ***,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 *** also exam-ined the degree to which the allelopathy contributes increased com-petitive ability of *** in the invaded *** We compared allelochemical production by *** 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 *** also tested the allelopathic effects of *** 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 *** was grown in monocul-ture or with *** 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 *** findings Allelochemical contents(total phenolics,total flavones and total saponins)and allelopathic effects were greater in *** sampled from China than those from the USA as demonstrated in a field survey and a common garden *** of ***-ata germination using *** extracts or previously grown in soil was greater using samples from China than from the *** competitive ability of *** against *** was also greater for plants originating from China than those from the *** could explain about 46%of the *** find-ings demonstrated that *** has evolved to be more allelo-pathic and competitive in the introdu

关键词： allelopathy biogeographical approach common garden experiment competition invasion speciesreceived

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