Greenhouse gas fluxes from boreal forest soils during the snow-free period in Quebec, Canada.

Ullah, Sami and Frasier, Rebeccah and Pelletier, Luc and Moore, Tim R. (2009) Greenhouse gas fluxes from boreal forest soils during the snow-free period in Quebec, Canada. Canadian Journal of Forest Research, 39 (3). pp. 666-680. ISSN 0045-5067

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This paper presents soil fluxes of methane (CH4), nitrous oxide (N2O), and carbon dioxide (CO2) from 12 sites located in four major forest types, black spruce (Picea mariana (Mill.) BSP), jack pine (Pinus banksiana Lamb.), aspen (Populus spp.), and alder (Alnus spp.) stands, in the Eastmain and Chibougamau regions of Quebec. Fluxes were determined with closed chambers during the snow-free period from May to October 2007. Well-drained black spruce, jack pine, and aspen forest soils were net sinks of atmospheric CH4 (–0.33 ± 0.11 mg·m–2·day–1), while alder-dominated wetland soils were sources of CH4 (0.45 ± 0.12 mg·m–2·day–1). The cut-over alder wetland soil produced 131 times more CH4 than the undisturbed wetland soil. Soil moisture and temperature mainly regulated CH4 fluxes. N2O fluxes from these forest soils were highly variable and smaller (1.6 ± 0.33 µg N·m–2·h–1) than those from deciduous forest soils. N2O emission from the cut-over black spruce forest soil was 2.7 times greater than that from the mature black spruce forest soil. Large C/N ratios (27 to 78) and slow soil N mineralization and nitrification rates in these forest soils may have led to small N2O fluxes. CO2 emissions from these forest soils, ranging from 0.20 to 2.7 g·m–2·day–1, were mainly controlled by soil temperature.

Item Type: Journal Article
Journal or Publication Title: Canadian Journal of Forest Research
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/ge
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 31466
Deposited By: Dr. Sami Ullah
Deposited On: 19 Jan 2010 13:44
Refereed?: Yes
Published?: Published
Last Modified: 22 Jun 2019 02:44

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