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Biodiversity and belowground interactions mediate community invasion resistance against a tall herb invader

Journal of Plant Ecology 2010年第2期3卷 99-108页

作者： Christoph Scherber Peter NMwangi Martin Schmitz Michael Scherer-Lorenzen Holger Beßler Christof Engels Nico Eisenhauer Varvara DMigunova Stefan Scheu Wolfgang WWeisser Ernst-Detlef Schulze Bernhard Schmid Agroecology Department of Crop ScienceUniversity of GottingenWaldweg 26D-37073 GottingenGermany Institute of Evolutionary Biology and Environmental Studies University of ZurichWinterthurerstraße 92CH-8057 ZurichSwitzerland Max Planck Institute for Biogeochemistry Hans-Knoll Straße 10D-07745 JenaGermany Institute of Ecology Jena UniversityDornburger Straße 159D-07743 JenaGermany Institut fur Biologie II/Geobotanik Schanzlestr.1D-79104 FreiburgGermany Humboldt Universitat zu Berlin Fachgebiet PflanzenernahrungAlbrecht-Thaer-Weg 4D-14195 BerlinGermany J.F.Blumenbach Institute of Zoology and Anthropology University of GottingenBerliner Str.28D-37073 GottingenGermany K.I.Skryabin All-Russian Institute of Helminthology Bolschaya Tcheryomuschkinskaya str.28117218 MoscowRussia

Aims Species-rich plant communities are hypothesized to be more resistant against plant invasions because they use resources in a more efficient ***,the relative contributions of aboveground competition and belowground interactions for invasion resistance are still poorly *** We compared the performance of Knautia arvensis transplants growing in plots differing in plant diversity both under full competition and with shoots of neighbors tied back to determine the relative strength of aboveground competition in suppressing this test invader without the confounding effect of *** addition,we assessed the effects of belowground competition and soil-borne pathogens on transplant *** Findings Both aboveground competition and plant species richness strongly and independently affected invader *** biomass,height,leaf mass per area and flowering of transplanted individuals of *** decreased with increasing species richness of the host ***-rich and species-poor communities both imposed equally strong aboveground competition on ***,belowground interactions(especially belowground root competition)had strong negative effects on transplant *** addition,the presence of grasses in a plant community further reduced the performance of *** results suggest that belowground competition can render species-rich host communities more suppressive to newly arriving species,thus enhancing community invasion resistance.

关键词： aboveground competition competitive suppression belowground interactions root competition shoot exclusion species richness

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