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SUMMARY:The role of forests in regulating greenhouse gas emissions from bo
 real freshwater ecosystems - Erik Szkokan-Emilson\, Tanentzap Group
DTSTART:20170223T130000Z
DTEND:20170223T133000Z
UID:TALK69935@talks.cam.ac.uk
CONTACT:42122
DESCRIPTION:Boreal freshwater ecosystems are supersaturated with CO2 becau
 se of the respiration of forest-derived dissolved carbon in open waters\, 
 and represent a vector for the transfer of a significant portion of forest
  carbon to the atmosphere. In general\, freshwater ecosystems contribute a
 n estimated 0.65 Pg (in CO2 equivalents) and 1.4 Pg yr-1 of methane (CH4) 
 and carbon dioxide (CO2)\, respectively\, towards global carbon (C) emissi
 ons. But there is considerable variability in CO2 and CH4 production rates
  both within and among Boreal lakes\, and this may be related to largely-o
 verlooked C cycling in nearshore sediments\, where forest-derived organic 
 matter is expected to have a larger relative influence. Integrating contro
 lled biogeochemical experiments\, isotopic mixing models\, DNA sequencing\
 , and fluorescence spectroscopy\, I investigate the effects of forest-deri
 ved C on CO2 and CH4 production in Boreal lake sediments. I find that CO2 
 production rates are increased where a larger proportion of the C pool is 
 forest-derived\, and that leaf litter inputs may suppress rates of CH4 pro
 duction because of the inhibitory effects of available polyphenols. As cli
 mate change is predicted to shift plant community composition in forests a
 nd lakes\, and alter hydrologic regimes and delivery rates of forest-deriv
 ed C to freshwater ecosystems\, this change in the quality of inputs into 
 lake habitats can have far-reaching consequences for global C emissions.
LOCATION:Department of Plant Sciences\, Large Lecture Theatre
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