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Title: Tropical deforestation and the global carbon budget

Abstract

The CO{sub 2} concentration of the atmosphere has increased by almost 30% since 1800. This increase is due largely to two factors: the combustion of fossil fuel and deforestation to create croplands and pastures. Deforestation results in a net flux of carbon to the atmospheric because forests contain 20--50 times more carbon per unit area than agricultural lands. In recent decades, the tropics have been the primary region of deforestation.The annual rate of CO{sub 2} released due to tropical deforestation during the early 1990s has been estimated at between 1.2 and 2.3 gigatons C. The range represents uncertainties about both the rates of deforestation and the amounts of carbon stored in different types of tropical forests at the time of cutting. An evaluation of the role of tropical regions in the global carbon budget must include both the carbon flux to the atmosphere due to deforestation and carbon accumulation, if any, in intact forests. In the early 1990s, the release of CO{sub 2} from tropical deforestation appears to have been mostly offset by CO{sub 2} uptake occurring elsewhere in the tropics, according to an analysis of recent trends in the atmospheric concentrations of O{sub 2} and N{sub 2}. Interannual variationsmore » in climate and/or CO{sub 2} fertilization may have been responsible for the CO{sub 2} uptake in intact forests. These mechanisms are consistent with site-specific measurements of net carbon fluxes between tropical forests and the atmosphere, and with regional and global simulations using process-based biogeochemistry models. 86 refs., 1 fig., 6 tabs.« less

Authors:
;  [1];  [2];  [3]
  1. Ecosystems Center, Woods Hole, MA (United States). Marine Biological Lab.
  2. Woods Hole Research Center, MA (United States)
  3. Univ. of Alaska, Fairbanks, AK (United States)
Publication Date:
OSTI Identifier:
415577
Resource Type:
Journal Article
Journal Name:
Annual Review of Energy and the Environment
Additional Journal Information:
Journal Volume: 21; Other Information: PBD: 1996
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; TROPICAL REGIONS; DEFORESTATION; CARBON DIOXIDE; ECOLOGICAL CONCENTRATION; CLIMATIC CHANGE; GLOBAL ASPECTS; ENVIRONMENTAL IMPACTS; CARBON SINKS

Citation Formats

Melillo, J M, Kicklighter, D W, Houghton, R A, and McGuire, A D. Tropical deforestation and the global carbon budget. United States: N. p., 1996. Web. doi:10.1146/annurev.energy.21.1.293.
Melillo, J M, Kicklighter, D W, Houghton, R A, & McGuire, A D. Tropical deforestation and the global carbon budget. United States. https://doi.org/10.1146/annurev.energy.21.1.293
Melillo, J M, Kicklighter, D W, Houghton, R A, and McGuire, A D. 1996. "Tropical deforestation and the global carbon budget". United States. https://doi.org/10.1146/annurev.energy.21.1.293.
@article{osti_415577,
title = {Tropical deforestation and the global carbon budget},
author = {Melillo, J M and Kicklighter, D W and Houghton, R A and McGuire, A D},
abstractNote = {The CO{sub 2} concentration of the atmosphere has increased by almost 30% since 1800. This increase is due largely to two factors: the combustion of fossil fuel and deforestation to create croplands and pastures. Deforestation results in a net flux of carbon to the atmospheric because forests contain 20--50 times more carbon per unit area than agricultural lands. In recent decades, the tropics have been the primary region of deforestation.The annual rate of CO{sub 2} released due to tropical deforestation during the early 1990s has been estimated at between 1.2 and 2.3 gigatons C. The range represents uncertainties about both the rates of deforestation and the amounts of carbon stored in different types of tropical forests at the time of cutting. An evaluation of the role of tropical regions in the global carbon budget must include both the carbon flux to the atmosphere due to deforestation and carbon accumulation, if any, in intact forests. In the early 1990s, the release of CO{sub 2} from tropical deforestation appears to have been mostly offset by CO{sub 2} uptake occurring elsewhere in the tropics, according to an analysis of recent trends in the atmospheric concentrations of O{sub 2} and N{sub 2}. Interannual variations in climate and/or CO{sub 2} fertilization may have been responsible for the CO{sub 2} uptake in intact forests. These mechanisms are consistent with site-specific measurements of net carbon fluxes between tropical forests and the atmosphere, and with regional and global simulations using process-based biogeochemistry models. 86 refs., 1 fig., 6 tabs.},
doi = {10.1146/annurev.energy.21.1.293},
url = {https://www.osti.gov/biblio/415577}, journal = {Annual Review of Energy and the Environment},
number = ,
volume = 21,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}