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Medientyp:
E-Artikel
Titel:
Net Ecosystem Production of Two Contrasting Boreal Black Spruce Forest Communities
Beteiligte:
Gower, Stith T.;
Norman, John M.
Erschienen:
Springer-Verlag, 2003
Erschienen in:Ecosystems
Sprache:
Englisch
ISSN:
1432-9840;
1435-0629
Entstehung:
Anmerkungen:
Beschreibung:
<p>The objective of this study was to compare the carbon (C) budgets of two similar-aged boreal black spruce (Picea mariana [Mill.] BSP) forest communities: closed-canopy black spruce with feathermoss ground cover (BSFM) on moderately drained soils and open-canopy black spruce with Sphagnum ground cover (BSSP) on poorly drained soils. C content, soil surface carbon dioxide ( CO<sub>2</sub>) flux<tex-math>$({\rm R}_{{\rm S}})$</tex-math>, heterotrophic respiration<tex-math>$({\rm R}_{{\rm H}})$</tex-math>, net primary production (NPP), and net ecosystem production (NEP) were measured or estimated. The total C content for the two communities<tex-math>$({\rm BSFM},\ 113\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1};{\rm BSSP},\ 107\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1})$</tex-math>did not differ significantly (P = 0.95). However, annual<tex-math>${\rm R}_{{\rm S}}$</tex-math>was significantly greater (P < 0.0001) for the BSFM<tex-math>$(564\ {\rm g}\ {\rm C}\ {\rm m}^{-2}\ {\rm y}^{-1})$</tex-math>than the BSSP<tex-math>$(319\ {\rm g}\ {\rm C}\ {\rm m}^{-2}\ {\rm y}^{-1})$</tex-math>community. The greater<tex-math>${\rm R}_{{\rm H}}$</tex-math>in the BSFM<tex-math>$(440\ {\rm g}\ {\rm C}\ {\rm m}^{-2}\ {\rm y}^{-1})$</tex-math>than the BSSP community<tex-math>$(264\ {\rm g}\ {\rm C}\ {\rm m}^{-2}\ {\rm y}^{-1})$</tex-math>and the higher peat C content for the BSSP<tex-math>$(84\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1})$</tex-math>than the BSFM<tex-math>$(34\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1})$</tex-math>community provided evidence that the BSSP community had a lower decomposition rate than the BSFM community. NEP was significantly (P = 0.04) more negative for the BSFM community<tex-math>$(-222\pm 35\ {\rm g}\ {\rm C}\ {\rm m}^{-2}\ {\rm y}^{-1})$</tex-math>than the BSSP community<tex-math>$(-128\pm 14\ {\rm g}\ {\rm C}\ {\rm m}^{-2}\ {\rm y}^{-1})$</tex-math>, but both communities were C sources to the atmosphere. The results from this study illustrate the influence of small differences in edaphic conditions on ecosystem C accumulation.</p>