Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Mark E. Fenn; Christopher S. Ross; Susan L. Schilling; William D. Baccus; Michael A. Larrabee; Rebecca A. Lofgren
    Date: 2013
    Source: For. Ecol. Manage. 302: 240-253
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (2.06 MB)


    Wet,dry and throughfall deposition of N and S were measured for 2 years in three national parks in Washington State:Olympic,Mount Rainier,and North Cascades.Throughfall was measured using ion exchange resin (IER) collectors. A major objective of the study was to evaluate the effectiveness of IER throughfall measurements for monitoring deposition inputs,including cloudwater deposition, to forest stands in national parks and other protected areas. Wet deposition (0.9–2.0kgN-1ha-1yr)and throughfall (0.5–1.2kgN-1ha-1yr) deposition of inorganic N in the three parks were relatively low. Wet deposition of sulfur (1.0–3.2kg-1ha-1yr)was similar to wet deposition of inorganic nitrogen except at OLYM where wet deposition of S was higher than for N because of marine sources of SO4–S.Throughfall N deposition was lower than wet deposition of N because of strong preferential canopy consumption of nitrate (NO3–N), particularly during the wet winter periods.This phenomenon was previously reported for forests in this region, but its apparent near ubiquity in the region had not been recognized. Data on preferential canopy retention of NO3–N from wet-deposited N is shown for 38 stands in the Pacific Northwest of which 21 are newly-reported data.Deposition of NO3–N in throughfall at MORA and NOCA was reduced by 87% and 93% compared to wet deposition over the 2 years. In contrast, wet deposition of NH4–N was generally increased by passage through the canopy.This strong preferential canopy retention of wet-deposited NO3–N limits the usefulness of throughfall measurements as a N deposition monitoring approach in forests of the Pacific Northwest region of North America and in some other regions with low to moderate N deposition. As a potential remedy to this limitation, a simple method is proposed for estimating total N deposition in the study sites based on S/N ratios in wet deposition and throughfall S deposition.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Fenn, Mark E.; Ross, Christopher S.; Schilling, Susan L.; Baccus, William D.; Larrabee, Michael A.; Lofgren, Rebecca A. 2013. Atmospheric deposition of nitrogen and sulfur and preferential canopy consumption of nitrate in forests of the Pacific Northwest, USA. For. Ecol. Manage. 302: 240-253.


    Nitrogen deposition, Pacific Northwest forests, Canopy uptake, Throughfall, Passive monitoring, Ion exchange resin collectors

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page