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| DOI: | 10.2134/jeq2008.0371 |
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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/articles/38/3/1149
Last checked: 07/01/2014
Access conditions: Item is within a limited-access website
https://dl.sciencesocieties.org/publications/jeq/pdfs/38/3/1149
Last checked: 07/01/2014
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Burns, Douglas A.;
Boyer, Elizabeth W.;
Elliott, Emily W.;
Kendall, Carol |
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| Author Affiliation: | Burns and Kendall: U.S. Geological Survey; Boyer: Pennsylvania State University; Elliott: University of Pittsburgh |
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| Title: | Sources and transformations of nitrate from streams draining varying land uses: Evidence from dual isotope analysis |
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| Section: | Landscape and watershed processes
Other records with the "Landscape and watershed processes" Section
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| Source: | Journal of Environmental Quality. Vol. 38, No. 3, May 2009, p. 1149-1159. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 11 |
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| Related Web URL: | https://dl.sciencesocieties.org/publications/jeq/abstracts/38/3/1149
Last checked: 07/01/2014
Notes: Abstract only |
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| Keywords: | TIC Keywords: Biochemistry; Drainage; Eutrophication; Evaluations; Isotopes; Nitrate losses; Streams; Watershed management
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| Abstract/Contents: | "Knowledge of key sources and biogeochemical processes that affect the transport of nitrate (NO3 -) in streams can inform watershed management strategies for controlling downstream eutrophication. We applied dual isotope analysis of NO3 - to determine the dominant sources and processes that affect NO3 - concentrations in six stream/river watersheds of different land uses. Samples were collected monthly at a range of flow conditions for 15 mo during 2004-05 and analyzed for NO3 - concentrations, δ 15NNO3, and δ 18ONO3 Samples from two forested watersheds indicated that NO3 - derived from nitrification was dominant at baseflow. A watershed dominated by suburban land use had three δ 18ONO3 values greater than +25 [per mil], indicating a large direct contribution of atmospheric NO3 - transported to the stream during some high flows. Two watersheds with large proportions of agricultural land use had many δ 15NNO3 values greater than +9 [per mil], suggesting an animal waste source consistent with regional dairy farming practices. These data showed a linear seasonal pattern with a δ 18ONO3: δ 15NNO3 of 1:2, consistent with seasonally varying denitrification that peaked in late summer to early fall with the warmest temperatures and lowest annual streamflow. The large range of δ 15NNO3 values (10 [per mil]) indicates that NO3 - supply was likely not limiting the rate of denitrification, consistent with ground water and/or in-stream denitrification. Mixing of two or more distinct sources may have affected the seasonal isotope patterns observed in these two agricultural streams. In a mixed land use watershed of large drainage area, none of the source and process patterns observed in the small streams were evident. These results emphasize that observations at watersheds of a few to a few hundred km2 may be necessary to adequately quantify the relative roles of various NO3 - transport and process patterns that contribute to streamflow in large basins." |
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| Language: | English |
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| References: | 49 |
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| Note: | Map
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Burns, D. A., E. W. Boyer, E. W. Elliott, and C. Kendall. 2009. Sources and transformations of nitrate from streams draining varying land uses: Evidence from dual isotope analysis. J. Environ. Qual. 38(3):p. 1149-1159. |
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| DOI: 10.2134/jeq2008.0371 |
| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/articles/38/3/1149
Last checked: 07/01/2014
Access conditions: Item is within a limited-access website
https://dl.sciencesocieties.org/publications/jeq/pdfs/38/3/1149
Last checked: 07/01/2014
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2225072a |
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