Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 5, issue 6
Biogeosciences, 5, 1551–1558, 2008
https://doi.org/10.5194/bg-5-1551-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 5, 1551–1558, 2008
https://doi.org/10.5194/bg-5-1551-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Nov 2008

14 Nov 2008

No detectable aerobic methane efflux from plant material, nor from adsorption/desorption processes

M. U. F. Kirschbaum and A. Walcroft M. U. F. Kirschbaum and A. Walcroft
  • Landcare Research, Private Bag 11052, Palmerston North 4442, New Zealand

Abstract. In early 2006, Keppler et al. (Nature, 439:187–191) reported a novel finding that plant leaves, and even simple organic materials, can release methane under aerobic conditions. We investigated here whether the reported methane release might simply arise from methane desorption from sample surfaces after prior exposure to higher methane concentrations. We exposed standard cellulose filter papers (i.e. organic material with a high surface area) to atmospheric methane concentration and then transferred them to a low-methane atmosphere. Our results suggest that any desorption flux was extremely small (−0.0001±0.0019 ngCH4 kgDW−1 s−1) and would play no quantitatively significant role in modifying any measured methane fluxes.

We also incubated fresh detached leaves of several species and intact Zea mays seedlings under aerobic and low-light conditions. After correcting for a small measured methane influx into empty chambers, measured rates of methane emission by plant materials were zero or, at most, very small, ranging from −0.25±1.1 ngCH4 kgDW−1 s−1 for Zea mays seedlings to 0.10±0.08 ngCH4 kgDW−1 s−1 for a mixture of freshly detached grasses. These rates were much smaller than the rates originally reported by Keppler et al. (2006).

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