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    Author(s): Linda H. PardoMolly J. Robin-AbbotMark E. Fenn; Christine L. Goodale; Linda H. Geiser; Charles T. Driscoll; Edith B. Allen; Jill S. Baron; Roland Bobbink; William D. Bowman; Christopher M. Clark; Bridget Emmett; Frank S. Gilliam; Tara L. Greaver; Sharon J. Hall; Erik A. Lilleskov; Lingli Liu; Jason A. Lynch; Knute J. Nadelhoffer; Steven J. Perakis; John L. Stoddard; Kathleen C. Weathers; Robin L. Dennis
    Date: 2015
    Source: In: de Vries, W.; Hettelingh, J.-P.; Posch, M., eds. Critical loads and dynamic risk assessment. Dordrecht, The Netherlands: Springer: 129-169. Chapter 5.
    Publication Series: Book Chapter
    Station: Northern Research Station
    PDF: View PDF  (2.12 MB)

    Description

    Human activity in the last century has led to a significant increase in nitrogen (N) emissions and deposition (Galloway et al. 2004). Total N emissions in the United States have increased significantly since the 1950s (Galloway 1998, Galloway et al. 2003). As S deposition has declined in response to regulation, the rate of N deposition relative to S deposition has increased since the 1980s (Driscoll et al. 2001, 2003) followed by a general decrease in NOx emissions from electric utilities since the early 2000s. More recently, the relative proportion of NHx (NH4+ + NH3 ) to NOx (NO + NO2) emissions has also increased for many areas of the United States (Kelly et al. 2005; Lehmann et al. 2005).

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    Citation

    Pardo, Linda H.; Robin-Abbot, Molly J.; Fenn, Mark E.; Goodale, Christine L.; Geiser, Linda H.; Driscoll, Charles T.; Allen, Edith B.; Baron, Jill S.; Bobbink, Roland; Bowman, William D.; Clark, Christopher M.; Emmett, Bridget; Gilliam, Frank S.; Greaver, Tara L.; Hall, Sharon J.; Lilleskov, Erik A.; Liu, Lingli; Lynch, Jason A.; Nadelhoffer, Knute J.; Perakis, Steven J.; Stoddard, John L.; Weathers, Kathleen C.; Dennis, Robin L. 2015. Effects and empirical critical loads of nitrogen for ecoregions of the United States. In: de Vries, W.; Hettelingh, J.-P.; Posch, M., eds. Critical loads and dynamic risk assessment. Dordrecht, The Netherlands: Springer: 129-169. Chapter 5.

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https://www.fs.usda.gov/treesearch/pubs/48506