globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13278
论文题名:
Cheatgrass is favored by warming but not CO2 enrichment in a semi-arid grassland
作者: Blumenthal D.M.; Kray J.A.; Ortmans W.; Ziska L.H.; Pendall E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:9
起始页码: 3026
结束页码: 3038
语种: 英语
英文关键词: climate change ; global warming ; Great Plains grasslands ; growing season length ; nitrogen limitation ; plant invasion ; plant phenology ; rangeland ecosystems
Scopus关键词: carbon dioxide enrichment ; climate change ; global warming ; grass ; grassland ; nitrogen ; phenology ; rangeland ; semiarid region ; Great Plains ; Bromus tectorum
英文摘要: Elevated CO2 and warming may alter terrestrial ecosystems by promoting invasive plants with strong community and ecosystem impacts. Invasive plant responses to elevated CO2 and warming are difficult to predict, however, because of the many mechanisms involved, including modification of phenology, physiology, and cycling of nitrogen and water. Understanding the relative and interactive importance of these processes requires multifactor experiments under realistic field conditions. Here, we test how free-air CO2 enrichment (to 600 ppmv) and infrared warming (+1.5 °C day/3 °C night) influence a functionally and phenologically distinct invasive plant in semi-arid mixed-grass prairie. Bromus tectorum (cheatgrass), a fast-growing Eurasian winter annual grass, increases fire frequency and reduces biological diversity across millions of hectares in western North America. Across 2 years, we found that warming more than tripled B. tectorum biomass and seed production, due to a combination of increased recruitment and increased growth. These results were observed with and without competition from native species, under wet and dry conditions (corresponding with tenfold differences in B. tectorum biomass), and despite the fact that warming reduced soil water. In contrast, elevated CO2 had little effect on B. tectorum invasion or soil water, while reducing soil and plant nitrogen (N). We conclude that (1) warming may expand B. tectorum's phenological niche, allowing it to more successfully colonize the extensive, invasion-resistant northern mixed-grass prairie, and (2) in ecosystems where elevated CO2 decreases N availability, CO2 may have limited effects on B. tectorum and other nitrophilic invasive species. © 2016 John Wiley & Sons Ltd
资助项目: We are grateful to Erik Hardy, Dan LeCain, Jack Morgan, David Smith, and David Williams for their roles in developing and running the PHACE experiment, to Karen Burke, Julie Bushey, Mary Carlson, Katherine Dirsmith, Sarah Hylander, Lauren Mancini, Caitlin May, Matthew Parsons, Julia Pendergrass, and Nicole Reese for technical and field assistance, to Ronald Follett and Elizabeth Pruessner for analysis of tissue N and δ
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61322
Appears in Collections:影响、适应和脆弱性

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作者单位: Rangeland Resources Research Unit, USDA Agricultural Research Service, Fort Collins, CO, United States; Biodiversity and Landscape Unit, Gembloux Agro-Bio Tech, University of Liege, Gembloux, Belgium; Crop Systems and Global Change Laboratory, USDA Agricultural Research Service, Beltsville, MD, United States; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia; Department of Botany & Program in Ecology, University of Wyoming, Laramie, WY, United States

Recommended Citation:
Blumenthal D.M.,Kray J.A.,Ortmans W.,et al. Cheatgrass is favored by warming but not CO2 enrichment in a semi-arid grassland[J]. Global Change Biology,2016-01-01,22(9)
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