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Water and nitrogen ...
Water and nitrogen shape winter annual plant diversity and community composition in near-urban Sonoran Desert preserves
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- Wheeler, Megan M. (författare)
- School of Life Sciences, Arizona State University, Tempe, United States
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- Collins, Scott L. (författare)
- Department of Biology, University of New Mexico, 1 University of New Mexico, Albuquerque, United States
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- Grimm, Nancy B. (författare)
- School of Life Sciences, Arizona State University, Tempe, United States
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- Cook, Elizabeth M. (författare)
- Department of Environmental Science, Barnard College, New York City, United States
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- Clark, Christopher (författare)
- U.S. Environmental Protection Agency, Office of Research and Development, DC, Washington, United States
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- Sponseller, Ryan A. (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Hall, Sharon J. (författare)
- School of Life Sciences, Arizona State University, Tempe, United States
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(creator_code:org_t)
- 2021-03-30
- 2021
- Engelska.
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Ingår i: Ecological Monographs. - : Ecological Society of America (esa). - 0012-9615 .- 1557-7015. ; 91:3
- Relaterad länk:
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https://rss.onlineli...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Increased nitrogen (N) deposition threatens global biodiversity, but its effects in arid urban ecosystems are not well studied. In addition to altered N availability, urban environments also experience increases in other pollutants, decreased population connectivity, and altered biotic interactions, which can further impact biodiversity. In deserts, annual plant communities make up most of the plant diversity, support wildlife, and contribute to nutrient cycling and ecosystem processes. Functional trade-offs allowing coexistence of a diversity of annual plant species are well established, but maintenance of diversity in urban conditions and with increased availability of limiting nutrients has not been explored. We conducted a 13-yr N and phosphorus (P) addition experiment in Sonoran Desert preserves in and around Phoenix, Arizona, USA to test how nutrient availability interacts with growing season precipitation, urban location, and microhabitat to affect winter annual plant diversity. Using structural equation modeling and generalized linear mixed modeling, we found that annual plant taxonomic diversity was significantly reduced in N-enriched and urban plots. Water availability in both current and previous growing seasons impacted annual plant diversity, with significant interaction effects showing increased diversity in wetter years and greater responsiveness of the community to water following a wet year. However, there were no significant interactions between N enrichment and water availability, urban location, or microhabitat. Lowered diversity in urban preserves may be partly attributable to increased urban N deposition. Changes in biodiversity of showy species like annual wildflowers in urban preserves can have important implications for connections between urban residents and nature, and reduced diversity and community restructuring with N enrichment represents a challenge for future preservation of aridland biodiversity.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Nyckelord
- Arizona
- biodiversity
- CAP LTER
- desert annual plants
- fertilization
- nitrogen
- plant community composition
- species richness
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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