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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Abstract

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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