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Philos Trans R Soc Lond B Biol Sci. 2004 March 29; 359(1443): 493–498.
PMCID: PMC1693332

Through enhanced tree dynamics carbon dioxide enrichment may cause tropical forests to lose carbon.


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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Selected References

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  • Achard Frédéric, Eva Hugh D, Stibig Hans-Jürgen, Mayaux Philippe, Gallego Javier, Richards Timothy, Malingreau Jean-Paul. Determination of deforestation rates of the world's humid tropical forests. Science. 2002 Aug 9;297(5583):999–1002. [PubMed]
  • Baker Timothy R, Phillips Oliver L, Malhi Yadvinder, Almeida Samuel, Arroyo Luzmila, Di Fiore Anthony, Erwin Terry, Higuchi Niro, Killeen Timothy J, Laurance Susan G, et al. Increasing biomass in Amazonian forest plots. Philos Trans R Soc Lond B Biol Sci. 2004 Mar 29;359(1443):353–365. [PMC free article] [PubMed]
  • Korner Christian. Atmospheric science. Slow in, rapid out--carbon flux studies and Kyoto targets. Science. 2003 May 23;300(5623):1242–1243. [PubMed]
  • Körner C, Arnone JA., 3rd Responses to elevated carbon dioxide in artificial tropical ecosystems. Science. 1992 Sep 18;257(5077):1672–1675. [PubMed]
  • Lewis SL, Phillips OL, Baker TR, Lloyd J, Malhi Y, Almeida S, Higuchi N, Laurance WF, Neill DA, Silva JNM, et al. Concerted changes in tropical forest structure and dynamics: evidence from 50 South American long-term plots. Philos Trans R Soc Lond B Biol Sci. 2004 Mar 29;359(1443):421–436. [PMC free article] [PubMed]
  • Phillips OL, Gentry AH. Increasing turnover through time in tropical forests. Science. 1994 Feb 18;263(5149):954–958. [PubMed]
  • Phillips Oliver L, Vásquez Martínez Rodolfo, Arroyo Luzmila, Baker Timothy R, Killeen Timothy, Lewis Simon L, Malhi Yadvinder, Monteagudo Mendoza Abel, Neill David, Núez Vargas Percy, et al. Increasing dominance of large lianas in Amazonian forests. Nature. 2002 Aug 15;418(6899):770–774. [PubMed]
  • Phillips OL, Baker TR, Arroyo L, Higuchi N, Killeen TJ, Laurance WF, Lewis SL, Lloyd J, Malhi Y, Monteagudo A, et al. Pattern and process in Amazon tree turnover, 1976-2001. Philos Trans R Soc Lond B Biol Sci. 2004 Mar 29;359(1443):381–407. [PMC free article] [PubMed]

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