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Trends in stream nitrogen concentrations for forested reference catchments across the USA Public Deposited

https://ir.library.oregonstate.edu/concern/articles/np193968d

This is the publisher’s final pdf. The published article is copyrighted by IOP Publishing and can be found at:  http://iopscience.iop.org/1748-9326. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work.

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  • To 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.
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  • Argerich, A., Johnson, S. L., Sebestyen, S. D., Rhoades, C. C., Greathouse, E., Knoepp, J. D., ... Ice, G. G. (2013, March). Trends in stream nitrogen concentrations for forested reference catchments across the USA. Environmental Research Letters, 8(1). doi:10.1088/1748-9326/8/1/014039
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  • 8
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  • 1
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  • This synthesis was facilitated by funding from USDA Forest Service Research and Development, the National Council on Air and Stream Improvement, and the American Reinvestment and Recovery Act (PNW/OSU 10-JV-11260489-026). Collection and archiving of long-term data at these EFRs have been funded by the USDA Forest Service, National Science Foundation’s Long-Term Ecological Research (LTER) and Long-Term Research in Environmental Biology (LTREB) programs, and other site-specific grants.
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