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
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB93-212603 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
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. |