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TZUNTIL:20080330T010000Z
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DTSTART:20051030T030000
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RDATE:20061029T030000
RDATE:20071028T030000
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DTSTAMP:20260805T112310Z
DESCRIPTION:The composition of tree species is changing world-wide as a res
 ult of natural changes\, afforestation\, and global climate change. Becaus
 e tree species strongly alter soil biogeochemistry\, to predict the future
  global N2O and CH4 budgets the individual tree species effects on the flu
 xes and underlying mechanisms should be known.\n\nI used a Siberian affore
 station experiment to determine the tree species effects on the major N2O 
 proodcuing processes (denitrification and nitrification) and on activity a
 nd composition of soil methanotrophs. I showed that tree species differ 2-
 3 times by the potential rate of N2O emission. Using 18O isotopes in NO3- 
 it was determined that denitrification is the major N2O producing process 
 and the difference among tree species is mostly determined by the tree spe
 cies effects on N2O reduction by soil.\n\nSoil samples under different tre
 e species were also very different in atmospheric CH4 uptake rate. Incubat
 ion of soils with  13C-CH4 and determining thereafter 13C incorporation in
 to different PLFAs reveals similar pattern of labelling under all tree spe
 cies. This means that tree species likely do not affect diversity of soil 
 methanotrophs responsible for atmospheric CH4 uptake. Other factors appear
  to be responsible for difference in CH4 oxidation rate under different tr
 ee species.\n\nOverall\, tree species strongly affect N2O and CH4 fluxes. 
 Therefore\, future models of greenhouse gas fluxes should consider changes
  in tree species composition in the forests.
DTSTART;TZID=Europe/Berlin:20060515T160000
DTEND;TZID=Europe/Berlin:20060515T235959
LOCATION:H7Dr.-H.-Frisch-Str. 1-3
SUMMARY:Dr. Oleg Menyailo\, Abteilung Biogeochemie\, MPI für terrestrische 
 Mikrobiologie (Marburg): The Effect of Siberian Tree Species on N2O and CH
 4 Fluxes
TRANSP:TRANSPARENT
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