Abstract
Most lakes are oversaturated with CO2 and are net CO2 sources to the atmosphere, yet their contribution to the global carbon cycle is poorly constrained1,2,3,4. Their CO2 excess is widely attributed to in-lake oxidation of terrestrially produced dissolved organic carbon5. Here we use data collected over 26 years to show that the CO2 in 20 lakes is primarily delivered directly through inflowing streams rather than being produced in situ by degradation of terrestrial carbon. This implies that high CO2 concentrations and atmospheric emissions are not necessarily symptoms of heterotrophic lake ecosystems. Instead, the annual mean CO2 concentration increased with lake productivity and was proportional to the estimated net primary productivity of the catchment. Overall, about 1.6% of net primary productivity (range 1.2–2.2%) was lost to the atmosphere. Extrapolating globally, this is equivalent to CO2 losses of ∼0.9 Pg C yr−1 (range 0.7–1.3), consistent with existing estimates. These data and our catchment productivity hypothesis re-enforce the high connectivity found between lakes, their catchment and the global C cycle6. They indicate that future concentrations of CO2 in lakes, and losses to the atmosphere, will be highly sensitive to altered catchment management and concomitant effects of climate change that modify catchment productivity.
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Acknowledgements
D. Sleep carried out the 13C analysis on the aquatic bryophytes, L. King and S. Fielding collected and cleaned the diatom samples and J. Grey provided access to the mass spectrometers at Plön. We thank R. Bardgett, J. Cole, R. Milne, S. Sobek, E. Tipping and S. Waldron for advice. The Freshwater Biological Association provided the data from 1984. The Environment Agency funded the routine sampling of the lakes in 1991, 1995, 2000 and 2005.
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S.C.M. conceived the work, led the analysis and co-wrote the manuscript. P.A.B. undertook the diatom isotope work and analysis and co-wrote the manuscript. A.W.S. undertook the remainder of the isotope measurements. M.M.D.V. led the field work.
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Maberly, S., Barker, P., Stott, A. et al. Catchment productivity controls CO2 emissions from lakes. Nature Clim Change 3, 391–394 (2013). https://doi.org/10.1038/nclimate1748
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DOI: https://doi.org/10.1038/nclimate1748
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