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Science 12 July 1996:
Vol. 273. no. 5272, pp. 201 - 0
DOI: 10.1126/science.273.5272.201
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Perspectives

M. Keller, D. A. Clark, D. B. Clark, A. M. Weitz, E. Veldkamp

Knowledge of the amount of carbon in the environment, especially in the form of carbon dioxide, is important for understanding global climate change. Old-growth forests in particular have been thought to be steady-state systems in which carbon uptake is balanced by carbon emission. In their Perspective, Keller et al. discuss a recent article by Grace et al. in which this assumption is challenged.

M. Keller, A. M. Weitz, and E. Veldkamp are in the U.S. Department of Agriculture's Forest Service, International Institute of Tropical Forestry, Post Office Box 25000, Rio Piedras, Puerto Rico 00928-5000, USA. E-mail: 0003950184{at}mcimail.com
D. A. Clark and D. B. Clark are in the Department of Biology, University of Missouri, St. Louis, MO 63121, USA. E-mail: daclark{at}sloth.ots.ac.cr


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