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| Titel |
Quantifying the role of fire in the Earth system – Part 2: Impact on the net carbon balance of global terrestrial ecosystems for the 20th century |
| VerfasserIn |
F. Li, B. Bond-Lamberty, S. Levis |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2014-03-07), S.1345-1360 |
| Datensatznummer |
250117274
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| Publikation (Nr.) |
 copernicus.org/bg-11-1345-2014.pdf |
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| Zusammenfassung |
| Fire is the primary form of terrestrial ecosystem disturbance on a global
scale. It affects the net carbon balance of terrestrial ecosystems by
emitting carbon directly and immediately into the atmosphere from biomass
burning (the fire direct effect), and by changing net ecosystem productivity
and land-use carbon loss in post-fire regions due to biomass burning and
fire-induced vegetation mortality (the fire indirect effect). Here, we
provide the first quantitative assessment of the impact of fire on the net
carbon balance of global terrestrial ecosystems during the 20th century, and
investigate the roles of fire's direct and indirect effects. This is done by
quantifying the difference between the 20th century fire-on and fire-off
simulations with the NCAR Community Land Model CLM4.5 (prescribed vegetation
cover and uncoupled from the atmospheric model) as a model platform. Results
show that fire decreases the net carbon gain of global terrestrial ecosystems
by 1.0 Pg C yr−1 averaged across the 20th century, as a result of the
fire direct effect (1.9 Pg C yr−1) partly offset by the indirect
effect (−0.9 Pg C yr−1). Post-fire regions generally experience
decreased carbon gains, which is significant over tropical savannas and some
North American and East Asian forests. This decrease is due to the direct
effect usually exceeding the indirect effect, while they have similar spatial
patterns and opposite sign. The effect of fire on the net carbon balance
significantly declines until ∼1970 with a trend of 8 Tg C yr−1
due to an increasing indirect effect, and increases subsequently with a trend
of 18 Tg C yr−1 due to an increasing direct effect. These results help
constrain the global-scale dynamics of fire and the terrestrial carbon cycle. |
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