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    Author(s): William T. Peterjohn; Mary Beth Adams; Frank S. Gilliam
    Date: 1996
    Source: Biogeochemistry. 35: 507-522.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (790.0 KB)


    By synthesizing more than twenty years of research at the Fernow Experimental Forest, we have documented 7 symptoms of nitrogen saturation in two adjacent watersheds. The symptoms include: 1) high relative rates of net nitrification, 2) long-term increases in streamwater concentrations of nitrate and base cations, 3) relatively high nitrate concentrations in solution losses, 4) little seasonal variability in stream-water nitrate concentrations, 5) a high discharge of nitrate from a young aggrading forest, 6) a rapid increase in nitrate loss following fertilization of a young aggrading forest, and 7) low retention of inorganic nitrogen when compared with other forested sites. These data support current conceptual models of nitrogen saturation and provide a strong, and perhaps the best, example of nitrogen saturation in the United States.

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    Peterjohn, William T.; Adams, Mary Beth; Gilliam, Frank S. 1996. Symptoms of nitrogen saturation in two central Appalachian hardwood forest ecosystems. Biogeochemistry. 35: 507-522.


    acid rain, central Appalachia, global change, nitrogen cycling, nitrogen saturation, temperate forests, Fernow Experimental Forest

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