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| Titel |
Carbon emissions from deforestation in the Brazilian Amazon Region |
| VerfasserIn |
C. Potter, S. Klooster, V. Genovese |
| 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 ; 6, no. 11 ; Nr. 6, no. 11 (2009-11-02), S.2369-2381 |
| Datensatznummer |
250004080
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| Publikation (Nr.) |
 copernicus.org/bg-6-2369-2009.pdf |
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| Zusammenfassung |
| A simulation model based on satellite observations of
monthly vegetation greenness from the Moderate Resolution Imaging
Spectroradiometer (MODIS) was used to estimate monthly carbon fluxes in
terrestrial ecosystems of Brazilian Amazon and Cerrado regions over the period
2000–2002. The NASA-CASA (Carnegie Ames Stanford Approach) model estimates
of annual forest production were used for the first time as the basis to
generate a prediction for the standing pool of carbon in above-ground
biomass (AGB; g C m−2) for forested areas of the Brazilian Amazon
region. Plot-level measurements of the residence time of carbon in wood in
Amazon forest from Malhi et al. (2006) were interpolated by inverse distance
weighting algorithms and used with CASA to generate a new regional map of
AGB. Data from the Brazilian PRODES (Estimativa do Desflorestamento da
Amazônia) project were used to map deforested areas. Results show that
net primary production (NPP) sinks for carbon varied between 4.25 Pg C yr−1
(1 Pg=1015 g) and 4.34 Pg C for the region and were highest
across the eastern and northern Amazon areas, whereas deforestation sources
of CO2 flux from decomposition of residual woody debris were higher and
less seasonal in the central Amazon than in the eastern and southern areas.
Increased woody debris from past deforestation events was predicted to alter
the net ecosystem carbon balance of the Amazon region to generate annual
CO2 source fluxes at least two times higher than previously predicted
by CASA modeling studies. Variations in climate, land cover, and forest
burning were predicted to release carbon at rates of 0.5 to 1 Pg C yr−1
from the Brazilian Amazon. When direct deforestation emissions of CO2
from forest burning of between 0.2 and 0.6 Pg C yr−1 in the Legal
Amazon are overlooked in regional budgets, the year-to-year variations in
this net biome flux may appear to be large, whereas our model results
implies net biome fluxes had actually been relatively consistent from year
to year during the period 2000–2002. This is the first study to use MODIS
data to model all carbon pools (wood, leaf, root) dynamically in simulations
of Amazon forest deforestation from clearing and burning of all kinds. |
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