Treesearch
Soil nitrogen transformations under Populus tremuloides, Betula papyrifera and Acer saccharum following 3 years exposure to elevated CO2 and O3
| Authors: | William E. Holmes, Donald R. Zak, Kurt S. Pregitzer, John S. King |
| Year: | 2003 |
| Type: | Scientific Journal |
| Station: | Northern Research Station |
| DOI: | https://doi.org/10.1046/j.1365-2486.2003.00705.x |
| Source: | Global Change Biology. 9: 1743-1750. |
Download (PDF 102 KB): https://research.fs.usda.gov/download/treesearch/34622.pdf
Abstract
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.