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SUMMARY:Carbon uptake\, water and light use in a temperate forest: growing
  season phenology. - Andres Plaza
DTSTART:20130620T150000Z
DTEND:20130620T153000Z
UID:TALK44306@talks.cam.ac.uk
CONTACT:Megan Cooper
DESCRIPTION:As a marker of a changing climate there have been marked chang
 es in seasonal plant activity\, or phenology\, recently. Variation in phen
 ological events such as flowering\, budburst and leaf senescence are close
 ly linked to carbon and water cycles in forests\, and may be a sensitive a
 nd easily observable indicator of the effects of climate variability on ec
 osystem productivity.  \n\nThe aim of this study was to compare the season
 al progression in CO2 flux exchanging across a forest canopy with sap flow
  by individual trees\, as compared to canopy phenology indicators for a te
 mperate forest in the UK. \n\nDuring the 2012 growing season\, CO2 and H2O
  fluxes were measured from the footprint of a 90 ha block of plantation of
  mixed oak and ash woodland with an Eddy Covariance system\, and associate
 d meteorological observations. Sap flow was measured on 4 individual oak a
 nd ash trees using the THB (thermal heat balance). The quality of light re
 flected from the canopy was measured through webcam digital images and ana
 lysed as RGB (red\, green and blue) wavelength fluctuations. \n\nPrelimina
 ry analyses from sap flow\, RGB signals and CO2 exchange measurements allo
 wed us to determine the onset and the end of the growing season for one of
  the wettest years on record\, and identify the dates when key phenologica
 l events occurred for the two species. Find out whether the saw "Oak befor
 e ash\, in for a splash. Ash before oak\, in for a soak" held for that bli
 ghted summer of 2012!\n
LOCATION:Biffen Lecture Theater\, Department of Genetics
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