SS3.09 Climate-Lake Interactions
Date: Wednesday, June 12, 2002
Time: 11:30:00 AM
Location: Colwood
 
PhilibertA, Univ. of Quebec in Montreal, Montreal, Canada, alinediatom@yahoo.ca
Prairie, Y, T, Univ. of Quebec in Montreal, Montreal, Canada, prairie.yves@uqam.ca
Carcaillet, C, , Univ. of Montpellier, Montpellier, FRANCE, carcaillet@univ-montp2.fr
Enach, M, , Queen's University, Kingston, Canada, enachem@biology.queensu.ca
 
IS PAST RECONSTRUCTION OF LAKEWATER CO2 CONCENTRATION TRIGGERED BY CHANGES OF FIRE FREQUENCY?
image
Among the main poles of interest about global change, there is a growing concern for perturbations associated to global warming such as fire frequency. Indeed fire is even expected to have a much greater impact on the boreal forest than the direct effects of global warming. Fire is nowadays introduced as a tool in a sustainable management perspective and more studies are needed to perceive the impacts of fires into the lakes that are an integrant part of the boreal landscape. In order to know whether lakewater CO2 concentration can be a reliable indicator of fire frequency in boreal ecosystems, a long term diatom-based paleolimnological study was carried out in Lake Francis (Quebec)over teh last 7000 yrs. If lakewater CO2 concentrations mainly respond to each fire event by a short-term increasing, the continuous decline in CO2 along the entire core supports the role of an intriguing factor(s) difficult to distinguish. This is of first importance in the prediction of behaviour of lakes as a sink or a soucre of CO2 for the atmopshere.