Skip to Main Content
Decadal responses in soil N dynamics at the Bear Brook Watershed in Maine, USAAuthor(s): Sultana Jefts; Ivan J. Fernandez; Lindwey E. Rustad; D. Bryan Dail
Source: Forest Ecology and Management. 189: 189-205.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
PDF: Download Publication (490.21 KB)
DescriptionAtmospheric nitrogen deposition to forested ecosystems is a concern because of both geochemical and biological consequences for ecosystem integrity. High levels of prolonged N deposition can lead to "N saturation" of the ecosystem. The Bear Brook Watershed in Maine is a long-term, paired forested watershed experiment with over a decade of experimental N additions (~34 kg ha-1 per year = ambient + treatment) to investigate the biogeochemical consequences of N saturation. Both in situ and laboratory studies of N mineralization and nitrification were carried out to evaluate the changes in N cycling brought about by the long-term N additions. Consistent with hypotheses set forth in the literature (sensu [BioScience 39 (1989) 378]), the treated watershed had higher rates of N cycling compared to the reference watershed. In addition, we report important differences in N cycling rates as a function of forest cover type and soil horizon.
- 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.
- 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.
CitationJefts, Sultana; Fernandez, Ivan J.; Rustad, Lindwey E.; Dail, D. Bryan. 2004. Decadal responses in soil N dynamics at the Bear Brook Watershed in Maine, USA. Forest Ecology and Management. 189: 189-205.
Keywordsnitrogen cycling, nitrogen mineralization, nitrification, N saturation
- Nitrogen Excess in North American Ecosystems: Predisposing Factors, Ecosystem Responses, and Management Strategies
- Triple nitrate isotopes indicate differing nitrate source contributions to streams across a nitrogen saturation gradient
- Direct effects of temperature on forest nitrogen cycling revealed through analysis of long-term watershed records
XML: View XML