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    Author(s): William E. Holmes; Donald R. Zak; Kurt S. Pregitzer; John S. King
    Date: 2006
    Source: Ecosystems. 9: 1354-1363.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (111.73 KB)


    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.

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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.


    Acer saccharum, Betula papyrifera, carbon dioxide, FACE, gross N immobilization, gross N mineralization, microbial biomass, nitrogen cycling, ozone, Populus tremuloides

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