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DTSTART:20091025T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t75088id
DTSTAMP:20260822T073854Z
DESCRIPTION:Eingeladen durch G. Gebauer. Almost four years ago\, Keppler et
  al. (2006) reported from laboratory experiments that living plants\, plan
 t litter and the structural plant component pectin emit CH4 to the atmosph
 ere under aerobic conditions. These observations caused considerable contr
 oversy amongst the scientific community and the general public because of 
 their far-reaching implications. This was mainly for two reasons: firstly\
 , it is generally accepted knowledge that the reduced compound CH4 can onl
 y be produced naturally from organic matter by methanogens in the absence 
 of oxygen\, or at high temperatures\, e.g. in biomass burning. The fact th
 at no mechanism for an ‘aerobic’ production of CH4 had been identified at 
 the molecular level in plants added to the consternation. Secondly\, the f
 irst extrapolations from laboratory measurements to the global scale indic
 ated that these emissions could constitute a substantial fraction of the t
 otal global emissions of CH4. After publication of the findings of Keppler
  et al.\, their extrapolation procedure was severely criticised\, and othe
 r up-scaling calculations suggested a lower\, though still potentially sig
 nificant plant source of CH4 emissions. However\, it became clear\, that w
 ithout further insight into the mechanism of the ‘aerobic’ production of C
 H4\, any up-scaling approach would have considerable uncertainties and thu
 s be of questionable value. Therefore\, the principle scientific questions
  are now: if\, by how much\, and by what mechanisms is CH4 emitted from de
 ad plant matter and living vegetation. Some subsequent studies could not c
 onfirm the original findings of Keppler et al.\, however\, several more re
 cent studies including stable isotope studies have now confirmed CH4 forma
 tion from both dead plant tissues and living intact plants. An overview of
  the current state of the art and the most recent findings will be given i
 n this presentation.
DTSTART;TZID=Europe/Berlin:20100204T161500
DTEND;TZID=Europe/Berlin:20100204T174500
LOCATION:H6
SUMMARY:Dr. Frank Keppler\, Max-Planck-Institut für Chemie in Mainz\, Abt. 
 Atmosphärenchemie: Produzieren Pflanzen tatsächlich Methan?
TRANSP:TRANSPARENT
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