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Nature geoscience v.11 no.6, 2018년, pp.415 - 420   SCI SCIE
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Continental-scale decrease in net primary productivity in streams due to climate warming

Song, Chao    (Odum School of Ecology, University of Georgia, Athens, GA, USA. chaosong@uga.edu   ); Dodds, Walter K.    (Division of Biology, Kansas State University, Manhattan, KS, USA   ); Rüegg, Janine    (Division of Biology, Kansas State University, Manhattan, KS, USA   ); Argerich, Alba    (Stream Biofilm and Ecosystem Research Laboratory, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland   ); Baker, Christina L.    (Department of Forest Engineering, Resources, and Management, Oregon State University, Corvallis, OR, USA   ); Bowden, William B.    (School of Natural Resources, University of Missouri, Columbia, MO, USA   ); Douglas, Michael M.    (Department of Biology and Wildlife and Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, USA   ); Farrell, Kaitlin J.    (Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT, USA   ); Flinn, Michael B.    (School of Biological Sciences, and School of Agriculture and Environment, University of Western Australia, Perth, WA, Australia   ); Garcia, Erica A.    (Odum School of Ecology, University of Georgia, Athens, GA, USA   ); Helton, Ashley M.    (Department of Biological Sciences, Virginia Polyt  ); Harms, Tamara K.   Jia, Shufang   Jones, Jeremy B.   Koenig, Lauren E.   Kominoski, John S.   McDowell, William H.   McMaster, Damien   Parker, Samuel P.   Rosemond, Amy D.   Ruffing, Claire M.   Sheehan, Ken R.   Trentman, Matt T.   Whiles, Matt R.   Wollheim, Wilfred M.   Ballantyne IV, Ford  
  • 초록  

    Streams play a key role in the global carbon cycle. The balance between carbon intake through photosynthesis and carbon release via respiration influences carbon emissions from streams and depends on temperature. However, the lack of a comprehensive analysis of the temperature sensitivity of the metabolic balance in inland waters across latitudes and local climate conditions hinders an accurate projection of carbon emissions in a warmer future. Here, we use a model of diel dissolved oxygen dynamics, combined with high-frequency measurements of dissolved oxygen, light and temperature, to estimate the temperature sensitivities of gross primary production and ecosystem respiration in streams across six biomes, from the tropics to the arctic tundra. We find that the change in metabolic balance, that is, the ratio of gross primary production to ecosystem respiration, is a function of stream temperature and current metabolic balance. Applying this relationship to the global compilation of stream metabolism data, we find that a 1 °C increase in stream temperature leads to a convergence of metabolic balance and to a 23.6% overall decline in net ecosystem productivity across the streams studied. We suggest that if the relationship holds for similarly sized streams around the globe, the warming-induced shifts in metabolic balance will result in an increase of 0.0194 Pg carbon emitted from such streams every year.


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