Title: Elevated CO2 and O3 alter soil nitrogen transformations beneath trembling aspen, paper birch, and sugar maple
Author: Holmes, William E.; Zak, Donald R.; Pregitzer, Kurt S.; King, John S.;
Source: Ecosystems. 9: 1354-1363.
Publication Series: Scientific Journal (JRNL)
Nitrogen cycling in northern temperate forest ecosystems could change under increasing atmospheric CO2 and tropospheric O3 as a result of quantitative and qualitative changes in plant litter production. At the Aspen Free Air CO2-O3 Enrichment (FACE) experiment, we previously found that greater substrate inputs to soil under elevated CO2 did not alter gross N transformation rates in the first 3 years of the experiment. We hypothesized that greater litter production under elevated CO2 would eventually cause greater gross N transformation rates and that CO2 effects would be nullified by elevated O3. Following our original study, we continued measurement of gross N transformation rates for an additional four years.
Keywords: Acer saccharum, Betula papyrifera, carbon dioxide, FACE, gross N immobilization, gross N mineralization, microbial biomass, nitrogen cycling, ozone, Populus tremuloides
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Holmes, William E.; Zak, Donald R.; Pregitzer, Kurt S.; King, John S. 2006. Elevated CO2 and O3 alter soil nitrogen transformations beneath trembling aspen, paper birch, and sugar maple. Ecosystems. 9: 1354-1363.
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