CO2 and CH4 exchange from peatlands: Eastmain-1 hydroelectric project

Luc Pelletier, Michelle Garneau
GEOTOP-UQAM-McGill and Department of Geography,
Université du Québec à Montréal

Alain Tremblay
Environnement Illimité Inc. and Hydro-Québec Production

Carbon dioxide (CO2) and methane (CH4) fluxes were measured during snow free period of 2005 and 2006 on peatlands located in the Eastmain river watershed, Quebec, Canada, in order to estimate peatlands carbon budget from Eastmain-1 hydro-electric reservoir area prior to flooding

In June 2005, 6 bogs were chosen from which 3 have been flooded following the creation of the EM-1 hydro-electric reservoir at the end of 2005. Gas sampling was done on plastic collars installed in each peatlands following the microtopography gradient from hummocks to pools and measurements with static chambers. Net ecosystem exchange (NEE) from the 2005 and 2006 measurements on the bogs are similar between the different peatlands with CO2 NEE at photosynthetic photon flux density (PPFD) of 1800 mol m-1 s-1 ranging from -8 (3.8) (SE) to -11.9 (3.5) g CO2 m-2 d-1 in 2005 and -7.6 (1.7) to -11.2 (2.5) g CO2 m-2 d-1 in 2006. CH4 fluxes were more variable ranging from 53 (8.5) to 108 (12) mg CH4 m-2 d-1 in 2005 and 49 (12) to 115 (18) mg CH4 m-2 d-1 in 2006. CO2 and CH4 budget will be made by modelling fluxes based on continuous PPFD and peat temperature measurements, and mapping of the different biotype present in the different peatlands.


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