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Title: Soil nitrogen transformations under Populus tremuloides, Betula papyrifera and Acer saccharum following 3 years exposure to elevated CO2 and O3
Author: Holmes, William E.; Zak, Donald R.; Pregitzer, Kurt S.; King, John S.;
Source: Global Change Biology. 9: 1743-1750.
Publication Series: Scientific Journal (JRNL)
Increases in atmospheric CO2 and tropospheric O3 may affect forest N cycling by altering plant litter production and the availability of substrates for microbial metabolism. Three years following the establishment of our free-air CO2-O3 enrichment experiment, plant growth has been stimulated by elevated CO2 resulting in greater substrate input to soil; elevated O3 has counteracted this effect. We hypothesized that rates of soil N cycling would be enhanced by greater plant productivity under elevated CO2, and that CO2 effects would be dampened by O3.
Keywords: Acer, Betula, CO2, immobilization, mineralization, 15N, N cycling, O3, Populus
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Holmes, William E.; Zak, Donald R.; Pregitzer, Kurt S.; King, John S. 2003. Soil nitrogen transformations under Populus tremuloides, Betula papyrifera and Acer saccharum following 3 years exposure to elevated CO2 and O3
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