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| Titel |
Effect of UV radiation and temperature on the emission of methane from plant biomass and structural components |
| VerfasserIn |
I. Vigano, H. Weelden, R. Holzinger, F. Keppler, A. McLeod, T. Röckmann |
| 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. 3 ; Nr. 5, no. 3 (2008-06-26), S.937-947 |
| Datensatznummer |
250002532
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| Publikation (Nr.) |
 copernicus.org/bg-5-937-2008.pdf |
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| Zusammenfassung |
| The recently reported finding that plant matter and living plants produce
significant amounts of the important greenhouse gas methane under aerobic
conditions has led to an intense scientific and public controversy. Whereas
some studies question the up-scaling method that was used to estimate the
global source strength, others have suggested that experimental artifacts
could have caused the reported signals, and two studies, one based on
isotope labeling, have recently reported the absence of CH4 emissions
from plants. Here we show – using several independent experimental analysis
techniques – that dry and detached fresh plant matter, as well as several
structural plant components, emit significant amounts of methane upon
irradiation with UV light and/or heating. Emissions from UV irradiation are
almost instantaneous, indicating a direct photochemical process. Long-time
irradiation experiments demonstrate that the size of the CH4 producing
reservoir is large, exceeding potential interferences from degassing or
desorption processes by several orders of magnitude. A dry leaf of a pure
13C plant produces 13CH4 at a similar rate as dry leaves of
non-labeled plants produce non-labeled methane. |
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