Skip to Main Content
Trends in stream nitrogen concentrations for forested reference catchments across the USAAuthor(s): A. Argerich; S.L. Johnson; S.D. Sebestyen; C.C. Rhoades; E. Greathouse; J.D. Knoepp; M.B. Adams; G.E. Likens; J.L. Campbell; W.H. McDowell; F.N. Scatena; G.G. Ice
Source: Environmental Research Letters. 8: 014039.
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
View PDF (0 B)
Related Research Highlights
Long-term Nitrogen Trends Differ in Pristine Forested Streams
DescriptionTo examine whether stream nitrogen concentrations in forested reference catchments have changed over time and if patterns were consistent across the USA, we synthesized up to 44 yr of data collected from 22 catchments at seven USDA Forest Service Experimental Forests. Trends in stream nitrogen presented high spatial variability both among catchments at a site and among sites across the USA. We found both increasing and decreasing trends in monthly flow-weighted stream nitrate and ammonium concentrations. At a subset of the catchments, we found that the length and period of analysis influenced whether trends were positive, negative or non-significant. Trends also differed among neighboring catchments within several Experimental Forests, suggesting the importance of catchment-specific factors in determining nutrient exports. Over the longest time periods, trends were more consistent among catchments within sites, although there are fewer long-term records for analysis. These findings highlight the critical value of long-term, uninterrupted stream chemistry monitoring at a network of sites across the USA to elucidate patterns of change in nutrient concentrations at minimally disturbed forested sites.
- 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.
CitationArgerich, A.; Johnson, S. L.; Sebestyen, S. D.; Rhoades, C. C.; Greathouse, E.; Knoepp, J. D.; Adams, M. B.; Likens, G. E.; Campbell, J. L.; McDowell, W. H.; Scatena, F. N.; Ice, G. G. 2013. Trends in stream nitrogen concentrations for forested reference catchments across the USA. Environmental Research Letters. 8: 014039.
Keywordsnitrate, ammonium, trends, stream, forested catchment, reference catchments
- The legacy of a severe wildfire on stream nitrogen and carbon in headwater catchments
- Fine scale variations of surface water chemistry in an ephemeral to perennial drainage network
- US Forest Service Experimental Forests and Ranges Network: a continental research platform for catchment-scale research
XML: View XML