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- W2139355069 abstract "From 27 June to 3 September 1999, CO 2 fluxes from a 5-year-old, 84.15-ha vegetated clearcut in sub-boreal British Columbia were measured using a Bowen ratio energy balance (BREB) system and a second approach (the component model) that was based on scaled up CO 2 -flux measurements from belowground and plants (spruce seedlings and representative deciduous species). Over the 69-day study period both methods estimated the site to be a small sink for CO 2 (22.4 and 85 g C·m 2 , respectively). Differences between the sink size of the two approaches largely resulted from a divergence in the data after 7 August when the BREB data indicated a switch from sink to source approximately 14 days in advance of the same change from sink to source seen in the component model data. The main components of the CO 2 flux within the clearcut were belowground respiration (338 g C·m 2 ) and deciduous plant photosynthesis (375 g C·m 2 ). The conifer seedlings were only a minor component in overall CO 2 flux over the growing season (48 g C·m 2 ). The small overall sink estimated for the site for the approximately 2.5-month growing period would likely have been surmounted by the belowground respiration if the yearly CO 2 fluxes had been taken into account. For example, an additional 68 g C·m 2 was added to the atmosphere from 3 to 23 September (based on belowground respiration data only), after deciduous plants senesced. This source alone was enough to push the site from a sink to a source for CO 2 ." @default.
- W2139355069 created "2016-06-24" @default.
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- W2139355069 date "2002-05-01" @default.
- W2139355069 modified "2023-09-27" @default.
- W2139355069 title "The growing season carbon balance of a sub-boreal clearcut 5 years after harvesting using two independent approaches to measure ecosystem CO<sub>2</sub> flux" @default.
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- W2139355069 doi "https://doi.org/10.1139/x01-187" @default.
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