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TZUNTIL:20160327T010000Z
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DTSTART:20131027T030000
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RDATE:20141026T030000
RDATE:20151025T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t116583id
DTSTAMP:20260404T071455Z
DESCRIPTION:Shifts in rainfall patterns and increasing temperatures associa
 ted with climate change are likely to cause widespread mortality of forest
  plants in regions where the duration and severity of droughts increase. O
 ne primary cause of drought-induced mortality is hydraulic failure of the 
 plant water transport system. Water stress creates trapped gas emboli in t
 his transport system\, which reduces the ability of plants to supply water
  to leaves for photosynthetic gas exchange and can ultimately result in de
 siccation and death. However\, at present we lack a clear picture of how t
 hresholds to hydraulic failure vary across a broad range of species and fo
 rest environments. Using a new data synthesis of woody plants (478 species
  from 185 sites)\, we show that the majority of forest species operate wit
 h narrow hydraulic safety margins against injurious levels of water stress
  and therefore face a high risk of mortality if significant declines in ra
 infall accompany increasing temperatures. Safety margins were largely inde
 pendent of mean annual precipitation\, with many species highly vulnerable
  to hydraulic failure regardless of their current rainfall environment. Th
 ese findings provide insight into why climate induced mortality is occurri
 ng not only in arid regions but also in mesic forests not normally conside
 red to be at risk.\nI will also discuss our group’s recent findings regard
 ing embolism repair. This process is important in determining the speed of
  plant recovery after drought. Our observations using synchrotron based mi
 cro computed tomography suggest that ability to refill varies dramatically
  between plant species depending on xylem structure.\n \n***\nInvited by B
 ettina Engelbrecht\, Functional and Tropical Plant Ecology
DTSTART;TZID=Europe/Berlin:20140605T000000
DTEND;TZID=Europe/Berlin:20140605T235959
SUMMARY:Dr. Brendan Choat\, Hawkesbury Institute for the Environment\, Univ
 ersity of Western Sydney\, Australia (Homepage): The resilience of forests
  to drought: applying organism scale physiology to global processes.
TRANSP:TRANSPARENT
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