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How forest edge-center transitions in the herb layer interact with beech dominance versus tree diversity

Journal of Plant Ecology 2016年第5期9卷 498-507页

作者： Claudia Normann teja tscharntke Christoph Scherber Department of Crop Sciences University of GöttingenGrisebachstraße 637077 GöttingenGermany Institute of Landscape Ecology University of MünsterHeisenbergstraße 248149 MünsterGermany

Aims Forest fragmentation and the associated augmentation of forest edge zones are increasing *** edges are characterized by altered plant species richness and community *** the tree layer and its species composition has been shown to influence herb layer composition,changes in tree species composition or richness may weaken or strengthen edge effects in forest *** studied effects of the edge-center transition,tree species composition and their potential interaction on the understory vegetation in the Hainich National Park,Germany’s largest connected deciduous forest,allowing to cover large edge-center *** We established 12 transects in an area of 75 km^(2) of continuous forest,6 beech-dominated and 6 in multispecies forest *** transect reached from the forest edge up to 500 m into the forest *** relevés were conducted in regular,logarithmic distances along each *** Findings Herb species richness was influenced by an interaction of edge effects and tree diversity *** increasing distance from the forest edge,herb species richness remained constant in multispecies forest stands but rapidly decreased in beech-dominated forest ***,herb richness was higher in the interior of multispecies forest *** forest specialists increased and percent generalists decreased with distance from the edge and this contrasting pattern was much more pronounced in beech-dominated *** using structural equation modeling,we identified litter depth mediated by tree species composition as the most important driver of herb layer plant species richness.

关键词： community composition Fagus sylvatica functional groups habitat specialists and generalists litter depth tree diversity

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Time course of plant diversity effects on Centaurea jacea establishment and the role of competition and herbivory

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Journal of Plant Ecology 2010年第2期3卷 109-121页

作者： Norma Nitschke Anne Ebeling Tanja Rottstock Christoph Scherber Cornelius Middelhoff Sylvia Creutzburg Alexandra Weigelt teja tscharntke Markus Fischer Wolfgang WWeisser Institute of Ecology Friedrich-Schiller-University JenaDornburger Strasse 15907743 JenaGermany Agroecology Georg-August-University GottingenWaldweg 2637073 GottingenGermany Institute of Biochemistry and Biology University of PotsdamMaulbeerallee 114469 PotsdamGermany Max-Planck-Institute for Biogeochemistry Hans-Knoll-Strasse 1007745 JenaGermany Institute of Biology I University of LeipzigJohannisallee 21-2304103LeipzigGermany Institute of Plant Sciences University of BernAltenbergrain 213013 BernSwitzerland

Aims Invasion resistance in experimental plant communities is known to increase with increasing diversity and further to depend on the presence of particular functional *** test whether these effects also hold true for the invader establishment phase beyond the seedling stage,we studied survival and performance of Centaurea jacea L.(brown knapweed)planted into experimental grassland communities of varying plant biodiversity over three consecutive ***,we analysed the role of insect herbivory and biomass of the recipient community for mediating diversity *** In 2005,seedlings of Centaurea were transplanted into experimental grassland communities(the Jena Experiment)covering a species richness(1–60)and functional group richness(1–4)*** of these transplants and the community surrounding them in each plot were sprayed with insecticide while the other half served as *** 2006 and 2007(during the second and third year after transplantation),we recorded survival,growth-related(*** biomass,height)and reproduction-related traits(*** of flower heads).Annual data on community aboveground biomass served as covariate to investigate mediating effects of aboveground competition with the recipient *** Findings Species richness was the most important factor responsible for Centaurea *** levels of diversity decreased survival and all performance traits in both *** diversity effects were partly driven by community biomass,but not fully explained by that covariate,suggesting the importance also of further *** influence of functional group richnesswas strong in the second year after transplantation and weaker in the third *** the particular functional groups,only the presence of legumes showed strong negative effects on Centaurea survival and weak negative effects on growth and reproduction,the latter two being mediated by *** herbivore reduction considerably b

关键词： invasion resistance aboveground competition biomass Jena Experiment experimental grassland Centaurea jacea

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Retracted： Diversity of ants across an altitudinal gradient in and outside a spruce forest in the Harz Mountains, Germany

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Insect Science 2012年第6期19卷 705-705页

作者： Marc Srour Germano Leao Demolin Leite Torsten Wappler teja tscharntke Christoph Scherber

The following article from Insect Science, ＇Diversity of ants across an altitudi- nal gradient in and outside a spruce forest in the Harz Mountains, Germany＇ by Marc Srour, Germano LeSo Demolin Leite, Torsten Wappler, teja tscharntke and Christoph Scherber, published online on 2 August 2012 in Wiley Online Library （http：//***）, has been retracted by agreement between the authors, the journal Editor in Chief, Le Kang, and Wiley Publishing Asia Pty Ltd. The retraction has been agreed due to concerns having been raised about the validity of the species richness values derived by the authors, and regarding the validity of the species determinations.

关键词： ANTS INSECT diversity SPECIES diversity ANIMAL species SPRUCE

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