globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13222
论文题名:
Terrestrial carbon balance in a drier world: The effects of water availability in southwestern North America
作者: Biederman J.A.; Scott R.L.; Goulden M.L.; Vargas R.; Litvak M.E.; Kolb T.E.; Yepez E.A.; Oechel W.C.; Blanken P.D.; Bell T.W.; Garatuza-Payan J.; Maurer G.E.; Dore S.; Burns S.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:5
起始页码: 1867
结束页码: 1879
语种: 英语
英文关键词: Carbon dioxide ; Climate ; Ecosystem ; Evapotranspiration ; Net ecosystem exchange ; Net ecosystem production ; Photosynthesis ; Productivity ; Respiration ; Semiarid ; Water
Scopus关键词: annual variation ; carbon balance ; climate change ; ecosystem response ; evapotranspiration ; net ecosystem exchange ; net ecosystem production ; photosynthesis ; resource availability ; respiration ; semiarid region ; spatiotemporal analysis ; trend analysis ; water resource ; North America ; carbon dioxide ; carbon cycle ; climate change ; desert climate ; drought ; Mexico ; photosynthesis ; season ; United States ; Carbon Cycle ; Carbon Dioxide ; Climate Change ; Desert Climate ; Droughts ; Mexico ; Photosynthesis ; Seasons ; Southwestern United States
英文摘要: Global modeling efforts indicate semiarid regions dominate the increasing trend and interannual variation of net CO2 exchange with the atmosphere, mainly driven by water availability. Many semiarid regions are expected to undergo climatic drying, but the impacts on net CO2 exchange are poorly understood due to limited semiarid flux observations. Here we evaluated 121 site-years of annual eddy covariance measurements of net and gross CO2 exchange (photosynthesis and respiration), precipitation, and evapotranspiration (ET) in 21 semiarid North American ecosystems with an observed range of 100 - 1000 mm in annual precipitation and records of 4-9 years each. In addition to evaluating spatial relationships among CO2 and water fluxes across sites, we separately quantified site-level temporal relationships, representing sensitivity to interannual variation. Across the climatic and ecological gradient, photosynthesis showed a saturating spatial relationship to precipitation, whereas the photosynthesis-ET relationship was linear, suggesting ET was a better proxy for water available to drive CO2 exchanges after hydrologic losses. Both photosynthesis and respiration showed similar site-level sensitivity to interannual changes in ET among the 21 ecosystems. Furthermore, these temporal relationships were not different from the spatial relationships of long-term mean CO2 exchanges with climatic ET. Consequently, a hypothetical 100-mm change in ET, whether short term or long term, was predicted to alter net ecosystem production (NEP) by 64 gCm-2 yr-1. Most of the unexplained NEP variability was related to persistent, site-specific function, suggesting prioritization of research on slow-changing controls. Common temporal and spatial sensitivity to water availability increases our confidence that site-level responses to interannual weather can be extrapolated for prediction of CO2 exchanges over decadal and longer timescales relevant to societal response to climate change. © 2016 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61403
Appears in Collections:影响、适应和脆弱性

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作者单位: Southwest Watershed Research Center, Agricultural Research Service, Tucson, AZ, United States; Department of Earth System Science, University of California Irvine, Irvine, CA, United States; Department of Plant and Soil Sciences, University of Delaware, Newark, DE, United States; Department of Biology, University of New Mexico, Albuquerque, NM, United States; School of Forestry, Northern Arizona University, Flagstaff, AZ, United States; Departamento de Ciencias del Agua y Medio Ambiente, Instituto Tecnológico de Sonora, Cd. Obregón, Sonora, Mexico; Global Change Research Group and Department of Biology, San Diego State University, San Diego, CA, United States; Department of Environment, Earth and Ecosystems, The Open University, Walton Hall, Milton Keynes, United Kingdom; Department of Geography, University of Colorado, Boulder, CO, United States; Earth Research Institute, University of California Santa Barbara, Santa Barbara, CA, United States; National Center for Atmospheric Research, Boulder, CO, United States

Recommended Citation:
Biederman J.A.,Scott R.L.,Goulden M.L.,et al. Terrestrial carbon balance in a drier world: The effects of water availability in southwestern North America[J]. Global Change Biology,2016-01-01,22(5)
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