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Sources of nitrate in rivers draining sixteen watersheds in the northeastern U.S.: Isotopic constraints
Authors:Mayer  Bernhard  Boyer  Elizabeth W.  Goodale  Christine  Jaworski  Norbert A.  van Breemen  Nico  Howarth  Robert W.  Seitzinger  Sybil  Billen  Gilles  Lajtha  Kate  Nadelhoffer  Knute  Van Dam  Douwe  Hetling  Leo J.  Nosal  Miloslav  Paustian  Keith
Affiliation:(1) Departments of Geology & Geophysics and Physics & Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4;(2) College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, NY, 13210, U.S.A;(3) Department of Plant Biology, Carnegie Institution of Washington, 260 Panama St., Stanford, CA, 94305, U.S.A;(4) USEPA (retired), 2004 S. Magnolia Ave., Sanford, FL, 32771, U.S.A;(5) Laboratory of Soil Science and Geology and Wageningen Institute for Environment and Climate Research, Wageningen University, Wageningen, the Netherlands;(6) Department of Ecology & Environmental Biology, Cornell University, Corson Hall, Ithaca, NY, 14853, U.S.A;(7) Rutgers University, Institute of Marine and Coastal Sciences, Rutgers/NOAA CMER Program, 71 Dudley Road, New Brunswick, NJ, 08901, U.S.A;(8) UMR Sisyphe, University of Paris VI, 4 Place Jussieu, 75005 Paris, France;(9) Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331, U.S.A;(10) Marine Biological Laboratory, The Ecosystems Center, Woods Hole, MA, 02543, U.S.A;(11) Department of Energy and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, New York, U.S.A;(12) Department of Mathematics & Statistics, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4;(13) Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado, 80523, U.S.A
Abstract:The feasibility of using nitrogen and oxygenisotope ratios of nitrate (NO3) forelucidating sources and transformations ofriverine nitrate was evaluated in a comparativestudy of 16 watersheds in the northeastern U.S.A. Stream water was sampled repeatedly at theoutlets of the watersheds between January andDecember 1999 for determining concentrations,delta15N values, and delta18Ovalues of riverine nitrate.In conjunction with information about land useand nitrogen fluxes,delta15Nnitrate anddelta18Onitrate values providedmainly information about sources of riverinenitrate. In predominantly forested watersheds,riverine nitrate had mean concentrations ofless than 0.4 mg NO3-N L–1,delta15Nnitrate values of lessthan +5permil, and delta18Onitratevalues between +12 and +19permil. This indicatesthat riverine nitrate was almost exclusivelyderived from soil nitrification processes withpotentially minor nitrate contributions fromatmospheric deposition in some catchments. Inwatersheds with significant agricultural andurban land use, concentrations of riverinenitrate were as high as 2.6 mg NO3-NL–1 with delta15Nnitratevalues between +5 and +8permil anddelta18Onitrate values generallybelow +15permil. Correlations between nitrateconcentrations, delta15Nnitratevalues, and N fluxes suggest that nitrate inwaste water constituted a major, and nitrate inmanure a minor additional source of riverinenitrate. Atmospheric nitrate deposition ornitrate-containing fertilizers were not asignificant source of riverine nitrate inwatersheds with significant agricultural andurban land use. Although complementary studiesindicate that in-stream denitrification wassignificant in all rivers, the isotopiccomposition of riverine nitrate sampled at theoutlet of the 16 watersheds did not provideevidence for denitrification in the form ofelevated delta15Nnitrate anddelta18Onitrate values. Relativelylow isotopic enrichment factors for nitrogenand oxygen during in-stream denitrification andcontinuous admixture of nitrate from theabove-described sources are thought to beresponsible for this finding.
Keywords:denitrification  nitrate  nitrate sources  rivers  stable isotopes    /content/fgtnfv856mecx68w/xxlarge948.gif"   alt="  delta"   align="  BASELINE"   BORDER="  0"  >15Nnitrate    /content/fgtnfv856mecx68w/xxlarge948.gif"   alt="  delta"   align="  BASELINE"   BORDER="  0"  >18Onitrate
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