| 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. |
| 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 |
