globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13609
论文题名:
Global synthesis of the temperature sensitivity of leaf litter breakdown in streams and rivers
作者: Follstad Shah J.J.; Kominoski J.S.; Ardón M.; Dodds W.K.; Gessner M.O.; Griffiths N.A.; Hawkins C.P.; Johnson S.L.; Lecerf A.; LeRoy C.J.; Manning D.W.P.; Rosemond A.D.; Sinsabaugh R.L.; Swan C.M.; Webster J.R.; Zeglin L.H.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:8
起始页码: 3064
结束页码: 3075
语种: 英语
英文关键词: activation energy ; breakdown ; carbon cycling ; climate change ; detritivore ; leaf chemistry ; metabolic theory ; microbe ; organic matter ; temperature sensitivity
Scopus关键词: Alnus
英文摘要: Streams and rivers are important conduits of terrestrially derived carbon (C) to atmospheric and marine reservoirs. Leaf litter breakdown rates are expected to increase as water temperatures rise in response to climate change. The magnitude of increase in breakdown rates is uncertain, given differences in litter quality and microbial and detritivore community responses to temperature, factors that can influence the apparent temperature sensitivity of breakdown and the relative proportion of C lost to the atmosphere vs. stored or transported downstream. Here, we synthesized 1025 records of litter breakdown in streams and rivers to quantify its temperature sensitivity, as measured by the activation energy (Ea, in eV). Temperature sensitivity of litter breakdown varied among twelve plant genera for which Ea could be calculated. Higher values of Ea were correlated with lower-quality litter, but these correlations were influenced by a single, N-fixing genus (Alnus). Ea values converged when genera were classified into three breakdown rate categories, potentially due to continual water availability in streams and rivers modulating the influence of leaf chemistry on breakdown. Across all data representing 85 plant genera, the Ea was 0.34 ± 0.04 eV, or approximately half the value (0.65 eV) predicted by metabolic theory. Our results indicate that average breakdown rates may increase by 5–21% with a 1–4 °C rise in water temperature, rather than a 10–45% increase expected, according to metabolic theory. Differential warming of tropical and temperate biomes could result in a similar proportional increase in breakdown rates, despite variation in Ea values for these regions (0.75 ± 0.13 eV and 0.27 ± 0.05 eV, respectively). The relative proportions of gaseous C loss and organic matter transport downstream should not change with rising temperature given that Ea values for breakdown mediated by microbes alone and microbes plus detritivores were similar at the global scale. © 2017 John Wiley & Sons Ltd
资助项目: Follstad Shah, J.J. ; Environmental and Sustainability Studies/Department of Geography, University of UtahUnited States ; 电子邮件: jennifer.shah@envst.utah.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60862
Appears in Collections:影响、适应和脆弱性

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作者单位: Environmental and Sustainability Studies/Department of Geography, University of Utah, Salt Lake City, UT, United States; Department of Watershed Sciences, Utah State University, Logan, UT, United States; Department of Biological Sciences, Florida International University, Miami, FL, United States; Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, United States; Division of Biology, Kansas State University, Manhattan, KS, United States; Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Stechlin, Germany; Department of Ecology, Berlin Institute of Technology (TU Berlin), Ernst-Reuter-Platz 1, Berlin, Germany; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Pacific Northwest Research Station, US Forest Service, Corvallis, OR, United States; Université de Toulouse, UPS, INP, CNRS, EcoLab (Laboratoire d’Écologie Fonctionnelle et Environnement), Toulouse, France; Environmental Studies Program, The Evergreen State College, Olympia, WA, United States; School of Environment and Natural Resources, Ohio State University, Columbus, OH, United States; Odum School of Ecology, University of Georgia, Athens, GA, United States; Department of Biology, University of New Mexico, Albuquerque, NM, United States; Department of Geography and Environmental Systems, University of Maryland-Baltimore County, Baltimore, MD, United States; Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States

Recommended Citation:
Follstad Shah J.J.,Kominoski J.S.,Ardón M.,et al. Global synthesis of the temperature sensitivity of leaf litter breakdown in streams and rivers[J]. Global Change Biology,2017-01-01,23(8)
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