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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/735

Title: Recent patterns and mechanisms of carbon exchange by terrestrial ecosystems
Authors: Schimel, DS
House, JI
Hibbard, KA
Bousquet, P
Ciais, P
Peylin, P
Braswell, BH
Apps, MJ
Baker, D
Bondeau, A
Canadell, J
Churkina, G
Cramer, W
Denning, AS
Field, CB
Friedlingstein, P
Goodale, C
Heimann, M
Houghton, RA
Melillo, JM
Moore, B
Murdiyarso, D
Noble, I
Pacala, SW
Prentice, IC
Raupach, MR
Rayner, PJ
Scholes, RJ
Steffen, WL
Wirth, C
Keywords: Carbon exchange
Terrestrial environments
Land use
Ecosystems
Biosphere
Carbon cycle
Issue Date: 8-Nov-2001
Publisher: Macmillan Publishers Ltd
Citation: Schimel, DS, et al. 2001. Recent patterns and mechanisms of carbon exchange by terrestrial ecosystems. Nature, vol. 414(6860), pp 169-172
Abstract: Knowledge of carbon exchange between the atmosphere, land and the oceans is important, given that the terrestrial and marine environments are currently absorbing about half of the carbon dioxide that is emitted by fossil-fuel combustion. This carbon uptake is therefore limiting the extent of atmospheric and climatic change, but its long-term nature remains uncertain. Here the authors provide an overview of the current state of knowledge of global and regional patterns of carbon exchange by terrestrial ecosystems. Atmospheric carbon dioxide and oxygen data confirm that the terrestrial biosphere was largely neutral with respect to net carbon exchange during the 1980s, but became a net carbon sink in the 1990s. This recent sink can be largely attributed to northern extra tropical areas, and is roughly split between North America and Eurasia. Tropical land areas, however, were approximately in balance with respect to carbon exchange, implying a carbon sink that offset emissions due to tropical deforestation. The evolution of the terrestrial carbon sink is largely the result of changes in land use over time, such as regrowth on abandoned agricultural land and fire prevention, in addition to responses to environmental changes, such as longer growing seasons, and fertilization by carbon dioxide and nitrogen. Nevertheless, there remain considerable uncertainties as to the magnitude of the sink in different regions and the contribution of different processes.
Description: Copyright: 2001 Macmillan Publishers Ltd
URI: http://hdl.handle.net/10204/735
ISSN: 0028-0836
Appears in Collections:Climate change
Ecosystems processes & dynamics
General science, engineering & technology

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