Journal
NEW PHYTOLOGIST
Volume 168, Issue 3, Pages 623-635Publisher
WILEY
DOI: 10.1111/j.1469-8137.2005.01557.x
Keywords
aspen FACE (free-air CO2 enrichment); elevated carbon dioxide; global change; net primary production (NPP); tropospheric ozone (O-3)
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Concentrations of atmospheric CO2 and tropospheric ozone (O-3) are rising concurrently in the atmosphere, with potentially antagonistic effects on forest net primary production (NPP) and implications for terrestrial carbon sequestration. Using free-air CO2 enrichment (FACE) technology, we exposed north-temperate forest communities to concentrations of CO2 and O-3 predicted for the year 2050 for the first 7 yr of stand development. Site-specific allometric equations were applied to annual nondestructive growth measurements to estimate above- and below-ground biomass and NPP for each year of the experiment. Relative to the control, elevated CO2 increased total biomass 25, 45 and 60% in the aspen, aspen-birch and aspen-maple communities, respectively. Tropospheric O-3 caused 23, 13 and 14% reductions in total biomass relative to the control in the respective communities. Combined fumigation resulted in total biomass response of -7.8, +8.4 and +24.3% relative to the control in the aspen, aspen-birch and aspen-sugar maple communities, respectively. These results indicate that exposure to even moderate levels of O-3 significantly reduce the capacity of NPP to respond to elevated CO2 in some forests.
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