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TZUNTIL:20101031T010000Z
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DTSTART:20081026T030000
TZOFFSETFROM:+0200
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RDATE:20091025T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t62439id
DTSTAMP:20260312T233641Z
DESCRIPTION:Eingelagen durch Prof Jentsch. High latitude regions have been 
 and will be most heavily impacted by climate warming. Recent rapid warming
  already has altered ecological relationships in the boreal forest and a w
 idespread “browing” or reversal of the former positive relationship with w
 arm temperatures has been reported. This change in relationship between tr
 ee growth and climate is not only affecting growth performance and carbon 
 uptake\, but on a different level is challenging the field of dendroclimat
 ology\, where tree rings are used for climate reconstructions. The use of 
 tree rings as climate proxy relies on a /constant/ relationship between tr
 ee growth and climate factors\, the “Uniformitarian principle”. Recent evi
 dences\, especially from the boreal region\, suggest challenges to this in
 terpretation of the uniformitarian principle\, such as plastic relationshi
 ps between climate driver and ring width or isotopic composition\, tempera
 ture thresholds controlling growth\, age dependency of the climate-growth 
 relationships or diverging long term growth trends. So far there is only o
 ne hypothesis able to explain most (or all) of these phenomena – the adapt
 ation of tree species to a rapidly changing environment. While this proces
 s probably does not surprise ecologists\, it does challenge the methodolog
 y of a field which has provided most of the millennial climate reconstruct
 ions\, covering medieval warm period and little ice age\, used today in th
 e international climate assessments.  
DTSTART;TZID=Europe/Berlin:20081030T170000
DTEND;TZID=Europe/Berlin:20081030T235959
LOCATION:H6
SUMMARY:Dr. Martin Wilmking\, Working Group: Ecosystem Dynamics\, Institute
  for Botany and Landscape Ecology\, University Greifswald: Recent rapid wa
 rming and the boreal forest - Ecological challenges to paleoclimatic recon
 structions
TRANSP:TRANSPARENT
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