The fate of 15N-labelled nitrate additions to a northern hardwood forest in eastern Maine, USA Nadelhoffer, Knute J. ; Downs, Martha R. ; Fry, Brian ; Aber, John D. ; Magill, Alison H. ; Melillo, Jerry M. Abstract Publication: Oecologia Pub Date: 1995 DOI: 10.1007/BF00328617 Bibcode: 1995Oecol.103..292N