Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Biological Sinks for Nitrogen Additions to a Forested Catchment.
Author Nadelhoffer, K. J. ; Aber, J. D. ; Downs, M. R. ; Fry, B. ; Melillo, J. M. ;
CORP Author Marine Biological Lab., Woods Hole, MA. Ecosystems Center. ;New Hampshire Univ., Durham. Complex Systems Research Center.;Corvallis Environmental Research Lab., OR.;National Science Foundation, Washington, DC.
Publisher c1992
Year Published 1992
Report Number NSF-BSR90-09190; EPA/600/A-92/292;
Stock Number PB93-141174
Additional Subjects Watersheds ; Nitrogen ; Biological effects ; Water pollution effects ; Soil surveys ; Forests ; Bear Brook ; Maine ; Tracer techniques ; Ecosystems ; Plant growth ; Trees(Plants) ; Deposition ; Water quality ; Ecosystems ;
Library Call Number Additional Info Location Last
NTIS  PB93-141174 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/12/1993
Collation 9p
The goal of our research is to identify and quantify sinks for experimental Nitrogen (N) additions to a forested catchment at the Bear Brooks Watershed in Maine (BBWM) where background N deposition rates are low (< 4 kg/ha/yr). Nitrogen applied to the watershed in April, June, August and October (16.8 kg/ha) 1991 was labeled with a (15)N tracer that increased the abundance of (15)N label from about 0.3663 atm % to 0.4366 atm %. Surface soil was the most important sink for the isotopically labelled N additions. We estimate using (15)N mass balancing that about 3/4 of the 16.8 kg N added during the 1991 growing season was retained in catchment soil and aboveground vegetation with soils being the dominant sink.