Water, Air, and Soil Pollution

, Volume 151, Issue 1–4, pp 373–396 | Cite as

Input-Output Budgets of Inorganic Nitrogen for 24 Forest Watersheds in the Northeastern United States: A Review

  • John L. Campbell
  • James W. Hornbeck
  • Myron J. Mitchell
  • Mary Beth Adams
  • Mark S. Castro
  • Charles T. Driscoll
  • Jeffrey S. Kahl
  • James N. Kochenderfer
  • Gene E. Likens
  • James A. Lynch
  • Peter S. Murdoch
  • Sarah J. Nelson
  • James B. Shanley


Input-output budgets for dissolved inorganic nitrogen (DIN) are summarized for 24 small watersheds at 15 locations in the northeasternUnited States. The study watersheds are completely forested, free of recent physical disturbances, and span a geographical region bounded by West Virginia on the south and west, and Maine on the north and east. Total N budgets are not presented; however, fluxes of inorganic N in precipitation and streamwater dominate inputs and outputs of N at these watersheds. The range in inputs of DIN in wet-only precipitation from nearby National Atmospheric Deposition Program (NADP) sites was 2.7 to 8.1 kg N ha-1 yr-1 (mean = 6.4 kg N ha-1 yr-1; median = 7.0 kg N ha-1 yr-1). Outputs of DIN in streamwater ranged from 0.1 to 5.7 kg N ha-1 yr-1 (mean = 2.0 kg N ha-1 yr-1; median = 1.7 kg N ha-1 yr-1). Precipitation inputs of DIN exceeded outputs in streamwater at all watersheds, with net retention of DIN ranging from 1.2 to 7.3 kg N ha-1 yr-1 (mean = 4.4 kg N ha-1 yr-1; median = 4.6 kg N ha-1 yr-1). Outputs of DIN in streamwater were predominantly NO3-N (mean = 89%; median = 94%). Wet deposition of DIN was not significantly related to DIN outputs in streamwater for these watersheds. Watershed characteristics such as hydrology, vegetation type, and land-use history affect DIN losses and may mask any relationship between inputs and outputs. Consequently, these factors need to be included in the development of indices and simulation models for predicting 'nitrogen saturation' and other ecological processes.

ammonium input-output relationships nitrate nitrogen nitrogen saturation watersheds 


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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • John L. Campbell
    • 1
  • James W. Hornbeck
    • 1
  • Myron J. Mitchell
    • 2
  • Mary Beth Adams
    • 1
  • Mark S. Castro
    • 3
  • Charles T. Driscoll
    • 4
  • Jeffrey S. Kahl
    • 5
  • James N. Kochenderfer
    • 1
  • Gene E. Likens
    • 6
  • James A. Lynch
    • 7
  • Peter S. Murdoch
    • 8
  • Sarah J. Nelson
    • 9
  • James B. Shanley
    • 10
  1. 1.Northeastern Research StationUSDA Forest ServiceDurhamU.S.A.
  2. 2.College of Environmental Science and Forestry, Faculty of Environmental and Forest BiologyState University of New YorkSyracuseU.S.A
  3. 3.Appalachian LaboratoryUniversity of Maryland Center for Environmental ScienceFrostburgU.S.A
  4. 4.Department of Civil and Environmental EngineeringSyracuse UniversitySyracuseU.S.A
  5. 5.Senator George J. Mitchell Center for Environmental and Watershed ResearchUniversity of MaineOronoU.S.A
  6. 6.Institute of Ecosystem StudiesMillbrookU.S.A
  7. 7.School of Forest ResourcesPennsylvania State UniversityUniversity ParkU.S.A
  8. 8.Water Resources DivisionUS Geological SurveyTroyU.S.A
  9. 9.Senator George J. Mitchell Center for Environmental and Watershed ResearchUniversity of MaineOronoU.S.A
  10. 10.Water Resources DivisionUS Geological SurveyMontpelierU.S.A

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