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Global synthesis ofthe temperaturesensitivity of leaflitter breakdown instreams and rivers Jennifer J. Follstad ShahJohn S. KominoskiMarcelo Ardón2016 год

Global synthesis of the temperature sensitivity of leaf litter breakdown in streams and rivers
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Аннотация: 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.
Год издания: 2016
Авторы: Jennifer J. Follstad Shah, John S. Kominoski, Marcelo Ardón, Walter K. Dodds, Mark O. Gessner, Natalie A. Griffiths, Charles P. Hawkins, Sherri L. Johnson, Antoine Lecerf, Carri J. LeRoy, David W. P. Manning, Amy D. Rosemond, Robert L. Sinsabaugh, Christopher M. Swan, Jackson R. Webster, Lydia H. Zeglin
Издательство: Wiley
Источник: Global Change Biology
Ключевые слова: Freshwater macroinvertebrate diversity and ecology, Hydrology and Watershed Management Studies, Smart Materials for Construction
Другие ссылки: Global Change Biology (HTML)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (HTML)
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (HTML)
VTechWorks (Virginia Tech) (PDF)
VTechWorks (Virginia Tech) (HTML)
Maryland Shared Open Access Repository (USMAI Consortium) (PDF)
Maryland Shared Open Access Repository (USMAI Consortium) (HTML)
PubMed (HTML)