Provincial and cosmopolitan: floristic composition of a dryland urban river

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• 作者：Juliet C. Stromberg ; Elizabeth Makings ; Amy Eyden ; Robert Madera…
• 关键词：Arid region ; Cosmopolitan ; Plant community ; Ecosystem restoration ; Riparian forest ; Urban river
• 刊名：Urban Ecosystems
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：19
• 期：1
• 页码：429-453
• 全文大小：1,705 KB
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• 作者单位：Juliet C. Stromberg (1)
  Elizabeth Makings (1)
  Amy Eyden (1)
  Robert Madera (1)
  John Samsky III (1)
  Francis S. Coburn (1)
  Brenton D. Scott (1)
  
  1. School of Life Sciences, Arizona State University, Tempe, AZ, 85287-4501, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Environmental Management
  Nature Conservation
  
• 出版者：Springer Netherlands
• ISSN：1573-1642

文摘

High rates of intercontinental exchange of plant species have caused scientists to ask whether floristic areas with similar environments are undergoing global homogenization. We focused on riparian forests of the urban Salt River (Sonoran Desert, USA) to ask: (1) Is the forest dominated by cosmopolitan or provincial elements? (2) Which trees planted in the irrigated cityscape have established along the river? (3) Which types of restoration interventions have favored provincial species? We surveyed tree abundance, size and vigor in belt transects among five reaches that differed in degree of restoration, and obtained data on tree species composition of the urban landscape and pre-development riparian zone. Our results reveal the urban riparian forest to have many cosmopolitan elements, owing in part to spillover of trees from the cultivated cityscape (e.g., Acacia stenophylla, Vitex agnus-castus). Global spread of some regional (Neotropical) riparian taxa (e.g., Parkinsonia aculeata, Prosopis) also has contributed to the cosmopolitan status. Yet, the forests retain a distinct regional signature. Unintentional restoration of winter floods has allowed for regeneration of Salix gooddingii, a vernally-adapted provincial pioneer, although its long-term survivorship is restricted to limited micro-sites (storm drain outfalls). Urbanization-related changes in stream hydrogeomorphology explain increases in some regional species (e.g., Washingtonia spp.) that historically were excluded from the river.