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Methane emissions from terrestrial plants under aerobic conditions

Abstract

Methane is an important greenhouse gas and its atmospheric concentration has almost tripled since pre-industrial times1,2. It plays a central role in atmospheric oxidation chemistry and affects stratospheric ozone and water vapour levels. Most of the methane from natural sources in Earth's atmosphere is thought to originate from biological processes in anoxic environments2. Here we demonstrate using stable carbon isotopes that methane is readily formed in situ in terrestrial plants under oxic conditions by a hitherto unrecognized process. Significant methane emissions from both intact plants and detached leaves were observed during incubation experiments in the laboratory and in the field. If our measurements are typical for short-lived biomass and scaled on a global basis, we estimate a methane source strength of 62–236 Tg yr-1 for living plants and 1–7 Tg yr-1 for plant litter (1 Tg = 1012 g). We suggest that this newly identified source may have important implications for the global methane budget and may call for a reconsideration of the role of natural methane sources in past climate change.

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Figure 1: Release rates and isotopic signatures of CH 4 formed by leaf tissue incubated in the dark.
Figure 2: Mixing ratios and δ 13 C values of CH 4 formed by intact plants.

References

  1. Lelieveld, J., Crutzen, P. J. & Dentener, F. J. Changing concentration, lifetimes and climate forcing of atmospheric methane. Tellus B 50, 128–150 (1998)

    Article  ADS  Google Scholar 

  2. Houghton, J. T. et al. (eds) Climate Change 2001: The Scientific Basis (Cambridge Univ. Press, Cambridge, 2001)

  3. Bartlett, K. B. & Harriss, R. C. Review and assessment of methane emissions from wetlands. Chemosphere 26, 261–320 (1993)

    Article  CAS  ADS  Google Scholar 

  4. Dlugokencky, E. J., Masarie, K. A., Lang, P. M. & Tans, P. P. Continuing decline in the growth rate of the atmospheric methane burden. Nature 393, 447–450 (1998)

    Article  CAS  ADS  Google Scholar 

  5. Walter, B. P., Heimann, M. & Matthews, E. Modeling modern methane emissions from natural wetlands 2. Interannual variations 1982–1993. J. Geophys. Res. 106, 34207–34219 (2001)

    Article  CAS  ADS  Google Scholar 

  6. Houweling, S., Dentener, F., Lelieveld, J., Walter, B. & Dlugokencky, E. The modeling of tropospheric methane: How well can point measurements be reproduced by a global model? J. Geophys. Res. 105, 8981–9002 (2000)

    Article  CAS  ADS  Google Scholar 

  7. Lowe, D. C. et al. Concentration and 13C records of atmospheric methane in New Zealand and Antarctica—Evidence for changes in methane sources. J. Geophys. Res. 99, 16913–16925 (1994)

    Article  CAS  ADS  Google Scholar 

  8. Quay, P. et al. The isotopic composition of atmospheric methane. Glob. Biogeochem. Cycles 13, 445–461 (1999)

    Article  CAS  ADS  Google Scholar 

  9. Frankenberg, C., Meirink, J. F., van Weele, M., Platt, U. & Wagner, T. Assessing methane emissions from global space-borne observations. Science 308, 1010–1014 (2005)

    Article  CAS  ADS  Google Scholar 

  10. Keppler, F., Kalin, R. M., Harper, D. B., McRoberts, W. C. & Hamilton, J. T. G. Dramatic 13C depletion in the plant methoxyl pool and its biogeochemical implications. Biogeosciences 1, 123–131 (2004)

    Article  CAS  ADS  Google Scholar 

  11. Hamilton, J. T. G., McRoberts, W. C., Keppler, F., Kalin, R. M. & Harper, D. B. Chloride methylation by plant pectin: An efficient environmentally significant process. Science 301, 206–209 (2003)

    Article  CAS  ADS  Google Scholar 

  12. Keppler, F., Harper, D. B., Röckmann, T., Moore, R. M. & Hamilton, J. T. G. New insight into the atmospheric chloromethane budget gained using stable carbon isotope ratios. Atmos. Chem. Phys. 5, 2403–2411 (2005)

    Article  CAS  ADS  Google Scholar 

  13. Saugier, B., Roy, J. & Mooney, H. A. in Global Terrestrial Productivity (eds Roy, J., Saugier, B. & Mooney, H. A.) 541–555 (Academic, San Diego, 2001)

    Google Scholar 

  14. Gogoi, N., Baruah, K. K., Gogoi, B. & Gupta, P. K. Methane emission characteristics and its relations with plant and soil parameters under irrigated rice ecosystem of northeast India. Chemosphere 59, 1677–1684 (2005)

    Article  CAS  ADS  Google Scholar 

  15. Sass, R. L. & Cicerone, R. J. Photosynthate allocations in rice plants: Food production or atmospheric methane? Proc. Natl Acad. Sci. USA 99, 11993–11995 (2002)

    Article  CAS  ADS  Google Scholar 

  16. FAO, Global Forest Resources Assessment 2000—Main Report (FAO Forestry Paper No. 140, Food and Agriculture Organization of the United Nations, Rome, 2001)

    Google Scholar 

  17. Dlugokencky, E. J. et al. Atmospheric methane levels off: Temporary pause or a new steady-state? Geophys. Res. Lett. 30 doi:10.1029/2003GL018126 (2003)

  18. Mayle, F. E., Beerling, D. J., Gosling, W. D. & Bush, M. B. Responses of Amazonian ecosystems to climatic and atmospheric carbon dioxide changes since the last glacial maximum. Phil. Trans. R. Soc. Biol. Sci. 359, 499–514 (2004)

    Article  CAS  Google Scholar 

  19. Petit, J. R. et al. Climate and atmospheric history of the past 420,000 years from the Vostok ice core, Antarctica. Nature 399, 429–436 (1999)

    Article  CAS  ADS  Google Scholar 

  20. Ferretti, D. et al. Unexpected changes to the global methane budget over the past 2000 years. Science 309, 1714–1717 (2005)

    Article  CAS  ADS  Google Scholar 

  21. Lassey, K. R., Lowe, D. C. & Manning, M. R. The trend in atmospheric methane δ13C implications for isotopic constraints on the global methane budget. Glob. Biogeochem. Cycles 14, 41–49 (2000)

    Article  CAS  ADS  Google Scholar 

  22. Houweling, S., Dentener, F. & Lelieveld, J. Simulation of preindustrial atmospheric methane to constrain the global source strength of natural wetlands. J. Geophys. Res. 105, 17243–17255 (2000)

    Article  CAS  ADS  Google Scholar 

  23. Cramer, W. et al. Global response of terrestrial ecosystem structure and function to CO2 and climate change: results from six dynamic global vegetation models. Glob. Change Biol. 7, 357–373 (2001)

    Article  ADS  Google Scholar 

Download references

Acknowledgements

We thank R. Conrad, J. Kesselmeier and D. Harper for comments on the manuscript; B. Knape, P. Franz, R. Shaheen, F. Kleinbongardt, V. Mallinger, R. Runck and C. McRoberts for technical assistance; the Botanical Garden of the University of Heidelberg for providing plant species from tropical regions; and the European Commission for a Marie Curie-Research Training Grant (F.K.). The ISOSTRAT project in Heidelberg was funded by the BMBF within the AFO2000 project.

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Correspondence to Frank Keppler.

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Supplementary Notes

This file contains Supplementary Tables 1 and 2, and Supplementary Figures 1–4. (DOC 127 kb)

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Keppler, F., Hamilton, J., Braß, M. et al. Methane emissions from terrestrial plants under aerobic conditions. Nature 439, 187–191 (2006). https://doi.org/10.1038/nature04420

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