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RECORD NUMBER: 574 OF 2349

OLS Field Name OLS Field Data
Main Title Experimental Inducement of Nitrogen Saturation at the Watershed Scale.
Author Kahl, J. S. ; Norton, S. A. ; Fernandez, I. J. ; Nadelhoffer, K. J. ; Driscoll, C. T. ;
CORP Author Maine Univ. at Orono. ;Marine Biological Lab., Woods Hole, MA. Ecosystems Center. ;State Univ. of New York Coll. of Environmental Science and Forestry, Syracuse. Dept. of Civil Engineering.;New Hampshire Univ., Durham. Complex Systems Research Center.;Corvallis Environmental Research Lab., OR.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-93/254;
Stock Number PB93-212603
Additional Subjects Watersheds ; Land pollution ; Water pollution ; Acidification ; Forest land ; Nitrogen cycle ; Air pollution ; Ecosystems ; Water quality ; Nitrogen oxides ; Air land interactions ; Deposition ; Trees(Botany) ; Experimental design ; Nutrients ; Reprints ; Nitrogen saturation
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NTIS  PB93-212603 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 11/22/1993
Collation 6p
Abstract Atmospheric nitrogen deposition to forested ecosystems in excess of vegetative demand may lead to a condition of terrestrial 'nitrogen saturation'. The subsequent increases in N export to surface waters are symptomatic of fundamental changes in terrestrial nutrient processing. The authors have experimentally induced incipient N saturation in a paired-catchment experiment at the Bear Brook Watershed in Maine (BBWM). Using modest loading rates of N compared to typical forest fertilization rates or the N pool in forest soils, the experiment has resulted in large increases in NO3(-) concentrations in streams. Nitrate flux from the treated catchment has increased from 200 to more than 500 equiv/ha/yr. Seasonal patterns in stream NO3(-) concentrations have been fundamentally altered by the treatment, with NO3(-) loss now occurring nearly all year from the experimental watershed. These results suggest that N saturation, soil acidification, and altered N cycling in forested watersheds may be induced at lower rates of N deposition than previously believed.
Supplementary Notes Pub. in Environmental Science and Technology, v27 n3 p565-568 1993. See also DE90791335. Prepared in cooperation with Marine Biological Lab., Woods Hole, MA. Ecosystems Center, and State Univ. of New York Coll. of Environmental Science and Forestry, Syracuse. Dept. of Civil Engineering. Sponsored by New Hampshire Univ., Durham. Complex Systems Research Center, and Corvallis Environmental Research
NTIS Title Notes Journal article.
Title Annotations Reprint: Experimental Inducement of Nitrogen Saturation at the Watershed Scale.
Category Codes 68D; 68A; 48D; 57H; 57C
NTIS Prices PC A02/MF A01
Primary Description 600/02
Document Type NT
Cataloging Source NTIS/MT
Control Number 325227561
Origin NTIS
Type CAT