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Science 6 December 2002:
Vol. 298. no. 5600, p. 1843
DOI: 10.1126/science.298.5600.1843f
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It is commonly assumed that plants will produce more biomass if the atmospheric CO2 concentrations continue to rise, but CO2 is not the only agent that effects plant growth. Shaw et al. (p. 1987; see the Perspective by Morgan) describe the responses of a grassland ecosystem to a suite of realistic changes in CO2, temperature, precipitation, and nitrogen deposition, alone and in combination. The response of net primary production (NPP) to elevated CO2 varies strikingly, depending on the status of other global-change factors. As a single factor, elevated CO2 increases aboveground growth, but when elevated CO2 is combined with other global changes, elevated CO2 tends to decrease NPP.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)