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| Titel |
Carbon balance of a partially harvested mixed conifer forest following mountain pine beetle attack and its comparison to a clear-cut |
| VerfasserIn |
A. Mathys, T. A. Black, Z. Nesic, G. Nishio, M. Brown, D. L. Spittlehouse, A. L. Fredeen, R. Bowler, R. S. Jassal, N. J. Grant, P. J. Burton, J. A. Trofymow, G. Meyer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 8 ; Nr. 10, no. 8 (2013-08-15), S.5451-5463 |
| Datensatznummer |
250085296
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| Publikation (Nr.) |
 copernicus.org/bg-10-5451-2013.pdf |
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| Zusammenfassung |
| 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 at MPB-09 increased from −108 g C m−2 in 2010 to
−57 g C m−2 in 2011. The increase of NEP was due to the associated
increase in annual gross ecosystem photosynthesis (GEP) from
812 g C m−2 in 2010 to 954 g C m−2 in 2011, exceeding the
increase in annual respiration (Re) from 920 g C m−2 to
1011 g C m−2 during the two years. During the four month period
between June and September 2010, NEP at MPB-09C was −103 g C m−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 g C m−2 in 2010 to
47 g C m−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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