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Amazonia and the modern carbon cycle: lessons learned
Jean Pierre H B Ometto1, Antonio D Nobre, Humberto R Rocha
1Laboratório de Ecologia Isotópica-CENA/USP, Av. Centenário, 303, 13416-000, Piracicaba, SP, Brazil. jpometto@cena.usp.br
Oecologia
|April 1, 2005
Summary
The Amazon rainforest
Area of Science:
- Ecology
- Biogeochemistry
- Climate Science
Background:
- The Amazon biome significantly influences global carbon cycling.
- Understanding its net primary productivity/net ecosystem exchange (NPP/NEE) is crucial.
- Climate change impacts on Amazonia's dynamics require investigation.
Purpose of the Study:
- To review critical issues in Amazonian carbon cycling.
- To evaluate the biome's contribution to global NPP/NEE.
- To assess climate change feedbacks on Amazonian dynamics.
Main Methods:
- Review of studies from the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA).
- Extrapolation of LBA-derived NPP/NEE values to the entire Brazilian Amazon.
- Comparison with global carbon budget estimates and atmospheric CO2 inversion models.
Main Results:
- Estimated carbon flux in Amazon forests ranges from -3.0 to 0.75 Pg C year(-1).
- Discrepancies between land-use change emissions and inversion models suggest a local sink or source.
- The study highlights the need to link local processes to global dynamics.
Conclusions:
- Amazonia's role in global carbon budgets is complex and requires further detailed study.
- Environmental variability must be incorporated into future research.
- Linking local ecological processes to regional and global carbon dynamics is essential.