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Permanent link (DOI): https://doi.org/10.7939/R3G744

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Net ecosystem productivity of temperate and boreal forests after clearcutting - a Fluxnet-Canada measurement and modelling synthesis Open Access

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Author or creator
Grant, R. F.
Barr, A. G.
Black, T. A.
Margolis, H. A.
McCaughey, J. H.
Trofymow, J. A.
Additional contributors
Subject/Keyword
Douglas-fir stand
British Columbia
Spruce stands
Carbon-dynamics
Norway spruce
Vancouver Island
Coarse woody debris
Old-growth
Southern Finland
Scots pine forests
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Abstract: Clearcutting strongly affects subsequent forest net ecosystem productivity (NEP). Hypotheses for ecological controls on NEP in the ecosystem model ecosys were tested with CO(2) fluxes measured by eddy covariance (EC) in three post-clearcut conifer chronosequences in different ecological zones across Canada. In the model, microbial colonization of postharvest fine and woody debris drove heterotrophic respiration (R(h)), and hence decomposition, microbial growth, N mineralization and asymbiotic N(2) fixation. These processes controlled root N uptake, and thereby CO(2) fixation in regrowing vegetation. Interactions among soil and plant processes allowed the model to simulate hourly CO(2) fluxes and annual NEP within the uncertainty of EC measurements from 2003 to 2007 over forest stands from 1 to 80 yr of age in all three chronosequences without site- or species-specific parameterization. The model was then used to study the impacts of increasing harvest removals on subsequent C stocks at one of the chronosequence sites. Model results indicated that increasing harvest removals would hasten recovery of NEP during the first 30 yr after clearcutting, but would reduce ecosystem C stocks by about 15% of the increased removals at the end of an 80-yr harvest cycle.
Date created
2010
DOI
doi:10.7939/R3G744
License information
Creative Commons Attribution 3.0 Unported
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Citation for previous publication
Grant, R.F., Barr, A.G., Black, T.A., Margolis, H.A., McCaughey, J.H. and Trofymow, J.A. (2010). Net ecosystem productivity of temperate and boreal forests after clearcutting - a Fluxnet-Canada measurement and modelling synthesis. Tellus B, 62B(5): 475-496. DOI: 10.1111/j.1600-0889.2010.00500.x.
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File title: Net ecosystem productivity of temperate and boreal forests after clearcuttinga FluxnetCanada measurement and modelling synthesis
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