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Forest edge–interior differentiation in the epiphytic lichen diversity of the forest steppe in the Khangai Mountains, Mongolia

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Journal of Plant Ecology 2014年第3期7卷 287-297页

作者： Markus Hauck Uwe de Bruyn Samjaa Javkhlan Dorjburgedaa Lkhagvadorj Department of Plant Ecology Albrecht von Haller Institute of Plant SciencesGeorg August University of GöttingenUntere Karspüle 237073 GöttingenGermany Von-Müller-Straße 30 26123 OldenburgGermany Institute of Botany Mongolian Academy of SciencesZhukov Street 7Ulan Bator 51Mongolia School of Economics and Business Mongolian State University of AgricultureUlan BatorMongolia

Aims The effects of traditional land use by mobile livestock keepers on biodiversity in forest steppe ecotones are insufficiently *** are an important part of forest plant *** we analyze differences in the diversity and composition of the epiphytic lichen vegetation between the edge and the interior of Siberian larch forests in the Khangai Mountains,western Mongolia,which are highly subdivided into *** asked whether the epiphytic lichen vegetation at the forest edge differs significantly from that in the interior,whether the edge is inhabited by more nitrophilous species than the interior and whether the density of nomad camps around the forest affects epiphytic lichen *** Cover percentages of epiphytic lichen species were recorded from 20 trees per plot on 6 plots in the interior and 6 plots at the edge of Larix sibirica *** position of nomad summer camps was surveyed using Global Positioning *** were analyzed with pairwise significance tests,analysis of similarities,nonmetric multidimensional scaling and canonical correspondence *** Findings The composition of the epiphytic lichen vegetation clearly differed between the two habitats,with more species being more frequent at the edge than in the ***,there was no difference in species richness(α-diversity).The epiphyte vegetation at the edge was more uniform and characterized by lower variation of tree-levelα-diversity and lowerβ-diversity than in the *** the edge,only nitrophytic lichens were dominant,whereas in the interior,nitrophytes and acidophytes were among the dominant *** pattern is probably attributable to the spatial heterogeneity of the intensity of forest grazing and was shown to be influenced by the density of nomad summer camps in the vicinity of the ***-levelα-diversity increased with stem diameter,but high-diameter trees were *** results suggest that the present level of forest pat

关键词： alpha-diversity beta-diversity edge effect nitrophytes pastoral nomadism

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