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  • 1
    In: Diversity and Distributions, July 2013, Vol.19(7), pp.738-748
    Description: Byline: Giovanni Trentanovi, Moritz Lippe, Tommaso Sitzia, Ulrike Ziechmann, Ingo Kowarik, Arne Cierjacks, Petr PyA ek Keywords: Alpha diversity; beta diversity; Betula pendula ; invasive species; Robinia pseudoacacia ; urban forest Abstract Aim Urbanization as a major global trend profoundly changes biodiversity patterns, and homogenization of urban biota due to expanding exotic species and declining native species is of increasing concern. Previous studies on this topic have mostly taken place at large scales that include high habitat heterogeneity. Here, we aimed at disentangling the effects of urbanization and plant invasion on species composition through the analysis of similarity patterns of urban plant assemblages at the community scale where species interact. Location Berlin, Germany. Methods We analysed how different levels of urbanization, specific components of the urban matrix and the dominance of a native (Betula pendula) versus an exotic tree species (Robinia pseudoacacia) affect alpha and beta diversity of urban woodland understorey vegetation in sixty-eight 100-m.sub.2 plots. Results Exotic dominance reduced alpha diversity, but not beta diversity of the total species pool. Comparing beta diversity among different species groups revealed significant but divergent effects of exotic dominance, habitat connectivity and levels of urbanization in native and non-native species assemblages. In particular, urbanity proved to homogenize the native species pool, whereas the beta diversity of the non-native species pool showed a more pronounced response to exotic dominance. Main conclusions Our data provide evidence that both the urban context and the dominance of exotic species can modify homogenization processes at the community level. These novel insights into the mechanisms of biotic homogenization of urban floras may contribute to mitigating the effects of urbanization on biodiversity. Author Affiliation:
    Keywords: Alpha Diversity ; Beta Diversity ; Betula Pendula ; Invasive Species ; Robinia Pseudoacacia ; Urban Forest
    ISSN: 1366-9516
    E-ISSN: 1472-4642
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  • 2
    Language: English
    In: Journal of Plant Nutrition and Soil Science, October 2010, Vol.173(5), pp.644-653
    Description: Riparian forests are assumed to play a crucial role in the global carbon cycle. However, little data are available on C stocks of floodplains in comparison to other terrestrial ecosystems. In this study, we quantified the C stocks of aboveground biomass and soils of riparian vegetation types at 76 sampling sites in the Donau‐Auen National Park in Austria. Based on our results and a remotely sensed vegetation map, we estimated total C stocks. Carbon stocks in soils (up to 354 t ha within 1 m below surface) were huge compared to other terrestrial ecosystems. As expected, soils of different vegetation types showed different texture with a higher percentage of sandy soils at the softwood sites, while loamy soils prevailed at hardwood sites. Total C stocks of vegetation types were significantly different, but reflect differences in woody plant biomass rather than in soil C stocks. Mature hardwood and cottonwood forests proved to have significantly higher total C stocks (474 and 403 t ha, respectively) than young reforestations (217 t ha) and meadows (212 t ha). The C pools of softwood forests (356 t ha) ranged between those of hardwood/cottonwood forests and of reforestations/meadows. Our study proves the relevance of floodplains as possible C sinks, which should be increasingly taken into account for river management. Furthermore, we conclude that plant‐species distribution does not indicate the conditions of sedimentation and soil C sequestration over the time span of interest for the development of soil C stocks.
    Keywords: Carbon Stocks ; Organic Carbon ; Donau‐Auen National Park ; Fluvial Ecosystems ; Riparian Forest
    ISSN: 1436-8730
    E-ISSN: 1522-2624
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