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Journal Article Nitrogen Saturation in Northern Forest Ecosystems: Excess nitrogen from fossil fuel combustion may stress the biosphere Get access John D. Aber, John D. Aber Search for other works by this author on: Oxford Academic Google Scholar Knute J. Nadelhoffer, Knute J. Nadelhoffer Search for other works by this author on: Oxford Academic Google Scholar Paul Steudler, Paul Steudler Search for other works by this author on: Oxford Academic Google Scholar Jerry M. Melillo Jerry M. Melillo Search for other works by this author on: Oxford Academic Google Scholar BioScience, Volume 39, Issue 6, June 1989, Pages 378–386, https://doi.org/10.2307/1311067 Published: 01 June 1989
Aber et al. (Thu,) studied this question.