@article {4986, title = {Seasonal variation in nitrate reductase activity in needles of high-elevation red spruce trees}, journal = {Canadian Journal of Forest Research}, volume = {22}, year = {1992}, note = {Tables}, pages = {375-380}, publisher = {NRC Research Press}, address = {Ottawa, Ontario, Canada}, keywords = {Pollution, Red spruce, Soils, Spruce-Fir forests}, author = {Tjoelker, Mark G and McLaughlin, Samuel B and DiCosty, R. J and Lindberg, Steven E and Norby, R. J} }