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| Titel |
No detectable aerobic methane efflux from plant material, nor from adsorption/desorption processes |
| VerfasserIn |
M. U. F. Kirschbaum, A. Walcroft |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 6 ; Nr. 5, no. 6 (2008-11-14), S.1551-1558 |
| Datensatznummer |
250002922
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| Publikation (Nr.) |
 copernicus.org/bg-5-1551-2008.pdf |
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| Zusammenfassung |
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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