You are here: Home
/ Publication Information
Title: Regional patterns in foliar 15N across a gradient of nitrogen deposition in the northeastern US
Author: Pardo, Linda H.; McNulty, Steven G.; Boggs, Johnny L.; Duke, Sara
Source: Environmental Pollution. 149: 293-302.
Description: Recent studies have demonstrated that natural abundance 15N can be a useful tool for assessing nitrogen saturation, because as nitrification and nitrate loss increase, a15N of foliage and soil also increases. We measured foliar a15N at 11 high-elevation spruce-fir stands along an N deposition gradient in 1987-1988 and at seven paired northern hardwood and spruce-fir stands in 1999. In 1999, foliar a15N increased from -5.2 to -0.7o/oo with increasing N deposition from Maine to NY. Foliar a15N decreased between 1987-1988 and 1999, while foliar %N increased and foliar C:N decreased at most sites. Foliar a15N was strongly correlated with N deposition, and was also positively correlated with net nitrification potential and negatively correlated with soil C:N ratio. Although the increase in foliar %N is consistent with a progression towards N saturation, other results of this study suggest that, in 1999, these stands were further from N saturation than in 1987-1988.
Keywords: N saturation, stable isotopes, spruce-fir, northern hardwood forests
View or Print this Publication (252 KB)
- 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.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
Pardo, Linda H.; McNulty, Steven G.; Boggs, Johnny L.; Duke, Sara 2007. Regional patterns in foliar 15N across a gradient of nitrogen deposition in the northeastern US. Environmental Pollution. 149: 293-302.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility