Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18823
Title: Amazonia and the modern carbon cycle: Lessons learned
Authors: Ometto, Jean Pierre Henry Balbaud
Nobre, Antônio Donato
Rocha, Humberto Ribeiro da
Artaxo, Paulo
Martinelli, Luiz Antônio
Keywords: Carbon
Carbon Dioxide
Carbon Cycle
Climate Change
Deforestation
Net Primary Production
Biomass
Biometry
Brasil
Climate
Ecosystem
Environmental Protection
Metabolism
Photosynthesis
Physiology
Review
Tree
Biomass
Biometry
Brasil
Carbon
Carbon Dioxide
Climate
Conservation Of Natural Resources
Ecosystem
Photosynthesis
Trees
Amazonia
South America
Western Hemisphere
World
Issue Date: 2005
metadata.dc.publisher.journal: Oecologia
metadata.dc.relation.ispartof: Volume 143, Número 4, Pags. 483-500
Abstract: In this paper, we review some critical issues regarding carbon cycling in Amazonia, as revealed by several studies conducted in the Large Scale Biosphere Atmosphere Experiment in Amazonia (LBA). We evaluate both the contribution of this magnificent biome for the global net primary productivity/net ecosystem exchange (NPP/NEE) and the feedbacks of climate change on the dynamics of Amazonia. In order to place Amazonia in a global perspective and make the carbon flux obtained through the LBA project comparable with global carbon budgets, we extrapolated NPP/NEE values found by LBA studies to the entire area of the Brazilian Amazon covered by rainforest. The carbon emissions due to land use changes for the tropical regions of the world produced values from 0.96 to 2.4 Pg C year-1, while atmospheric CO2 inversion models have recently indicated that tropical lands in the Americas could be exchanging a net 0.62±1.15 Pg C year-1 with the atmosphere. The difference calculated from these two methods would imply a local sink of approximately 1.6-1.7 Pg C year-1, or a source of 0.85 ton C ha-1 year-1. Using our crude extrapolation of LBA values for the Amazon forests (5 million km2) we estimate a range for the C flux in the region of -3.0 to 0.75 Pg C year-1. The exercise here does not account for environmental variability across the region, but it is an important driver for present and future studies linking local process (i.e. nutrient availability, photosynthetic capacity, and so forth) to global and regional dynamic approaches. © Springer-Verlag 2005.
metadata.dc.identifier.doi: 10.1007/s00442-005-0034-3
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