Canadian Forest Service Publications

Carbon balance of a partially harvested mixed conifer forest following mountain pine beetle attack and its comparison to a clear-cut. 2013. Mathys, A.; Black, T.A.; Nesic, Z.; Nishio, G.; Brown, M.; Spittlehouse, D.L.; Fredeen, A.L.; Bowler, R.; Jassal, R.S.; Grant, N.J.; Burton, P.J.; Trofymow, J.A.; Meyer, G. Biogeosciences. 10: 5451-5463.

Year: 2013

Available from: Pacific Forestry Centre

Catalog ID: 35428

Language: English

CFS Availability: PDF (download)

Available from the Journal's Web site.
DOI: 10.5194/bg-10-5451-2013

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The recent mountain pine beetle (MPB) outbreak has had an impact on the carbon (C) cycling of lodgepole pine forests in British Columbia. This study examines how partial harvesting as a forest management response to MPB infestation affects the net ecosystem production (NEP) of a mixed conifer forest (MPB-09) in Interior BC. MPB-09 is a 70-year-old stand that was partially harvested in 2009 after it had been attacked by MPB. Using the eddy-covariance technique, the C dynamics of the stand were studied over two years and compared to an adjacent clear-cut (MPB-09C) over the summertime. The annual NEP atMPB-09 increased from −108 gCm−2 in 2010 to −57 gCm−2 in 2011. The increase of NEP was due to the associated increase in annual gross ecosystem photosynthesis (GEP) from 812 g Cm−2 in 2010 to 954 g Cm−2 in 2011, exceeding the increase in annual respiration (Re) from 920 g Cm−2 to 1011 g Cm−2 during the two years. During the four month period between June and September 2010, NEP at MPB-09C was −103 gCm−2, indicating high C losses in the clear-cut. MPB-09 was a C sink during the growing season of both years, increasing from 9 gCm−2 in 2010 to 47 g Cm−2 in 2011. The increase of NEP in the partially harvested stand amounted to a recovery corresponding to a 26% increase in the maximum assimilation rate in the second year. This study shows that retaining the healthy residual forest can result in higher C sequestration of MPB-attacked stands compared to clear-cut harvesting.

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