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Philos Trans R Soc Lond B Biol Sci. Mar 29, 2004; 359(1443): 493–498.
PMCID: PMC1693332
Through enhanced tree dynamics carbon dioxide enrichment may cause tropical forests to lose carbon.
Christian Körner
Institute of Botany, University of Basel, Schönbeinstrasse 6, CH-4056 Basel, Switzerland.
Christian Körner: ch.koerner/at/unibas.ch
Abstract
The fixation and storage of C by tropical forests, which contain close to half of the globe's biomass C, may be affected by elevated atmospheric CO2 concentration. Classical theoretical approaches assume a uniform stimulation of photosynthesis and growth across taxa. Direct assessments of the C balance either by flux studies or by repeated forest inventories also suggest a current net uptake, although magnitudes sometimes exceed those missing required to balance the global C cycle. Reasons for such discrepancies may lie in the nature of forest dynamics and in differential responses of taxa or plant functional types. In this contribution I argue that CO2 enrichment may cause forests to become more dynamic and that faster tree turnover may in fact convert a stimulatory effect of elevated CO2 on photosynthesis and growth into a long-term net biomass C loss by favouring shorter-lived trees of lower wood density. At the least, this is a scenario that deserves inclusion into long-term projections of the C relations of tropical forests. Species and plant functional type specific responses ('biodiversity effects') and forest dynamics need to be accounted for in projections of future C storage and cycling in tropical forests.
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Articles from Philosophical Transactions of the Royal Society B: Biological Sciences are provided here courtesy of
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