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TZUNTIL:20131027T010000Z
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DTSTART:20111030T030000
TZOFFSETFROM:+0200
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RDATE:20121028T030000
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DTSTART:20120325T020000
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DTSTAMP:20260609T143702Z
DESCRIPTION: \nEingeladen durch G. Wiesenberg\nThe environmental and ecolog
 ical significance of peat soils is immense. Even though their total cover 
 only extends to 3-5% of the world's land area\, northern peatlands contain
  20-30% of the world’s soil carbon stock. In the perspective of global cli
 matic changes\, it is not known how a moderate temperature rise would affe
 ct the pool of peat OM and hence the long term carbon sequestration potent
 ial.\nWithin the PEATWARM project\, we investigated vulnerability of a Sph
 agnum peatland from the Jura Mountains (France) to climate change using an
  experimental system (Open Top Chambers – OTCs) to simulate in situ an inc
 rease in average temperature. The effect of the OTCs was especially appare
 nt in spring and summer\, with an increase of mean and maximal air tempera
 tures of ca. 1 and 3°C respectively. We examined the effects of temperatur
 e increase along a narrow fen-bog gradient on the vegetation\, above- and 
 belowground gas fluxes\, microbial diversity and activity in Sphagnum moss
 es and in peat and the dynamics of labile and recalcitrant OM of peat. We 
 especially investigated the effect of the OTCs on the abundance and distri
 bution of branched glycerol dialkyl glycerol tetraethers (GDGTs). These co
 mpounds are complex lipids of high molecular weight\, recently discovered 
 in soils. They are produced by still unknown bacteria and are increasingly
  used as palaeoclimate proxies. Their degree of methylation\, expressed in
  the MBT\, was shown to depend on mean annual air temperature (MAAT) and t
 o a lesser extent on soil pH\, whereas the relative abundance of cyclopent
 yl rings of branched GDGTs\, expressed in the CBT\, was related to soil pH
 .\nResults showed that despite the short duration of the climate experimen
 t (26 months)\, branched GDGT distribution was significantly affected by t
 he temperature rise. In addition\, the applicability of the MBT/CBT as pro
 xies for the reconstruction of temperature and pH in peat was examined by 
 analyzing branched GDGTs in a 4 m peat core collected in covering the last
  7\,400 yrs BP. The MBT/CBT proxies were shown to overestimate temperature
  and pH\, especially in the top part of the bog. A new calibration of the 
 MBT/CBT specific to peatlands could improve the accuracy of temperature an
 d pH reconstruction in these environments.\n 
DTSTART;TZID=Europe/Berlin:20120404T160000
DTEND;TZID=Europe/Berlin:20120404T173000
LOCATION:H6
SUMMARY:Dr. Arnaud Huguet\, Universite Pierre et Marie Curie\, Paris: Bacte
 rial tetraether membrane lipids in peatlands: application as temperature a
 nd pH proxies
TRANSP:TRANSPARENT
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