Nitrogen deposition and carbon sequestration

Knute J. Nadelhoffer (), Bridget A. Emmett, Per Gundersen, Chris J. Koopmans, Patrick Schleppi, Albert Tietema and Richard F. Wright
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Knute J. Nadelhoffer: The Marine Biological Laboratory
Bridget A. Emmett: Institute of Terrestrial Ecology
Per Gundersen: Danish Forest and Landscape Research Institute
Chris J. Koopmans: Louis Bolk Institute
Patrick Schleppi: Swiss Federal Institute for Forest, Snow and Landscape Research, WSL
Albert Tietema: University of Amsterdam
Richard F. Wright: Norwegian Institute for Water Research

Nature, 1999, vol. 400, issue 6745, 630-630

Abstract: Abstract Nadelhoffer et al. reply — Jenkinson et al. and Sievering are justifiably concerned that our 15N additions to forest floors do not account for the potential uptake of nitrogen input by forest canopies. We agree that canopies can remove nitrogen from the atmosphere, resulting in inputs to forest floors that are less than the total nitrogen deposition. A North American study1 has suggested that canopies remove, on average, 16% of total (organic+inorganic) atmospheric nitrogen input to forests, and concluded that nitrogen uptake by the canopy is probably small relative to the nitrogen requirements of trees. Spraying 15N-labelled ammonium and nitrate on the crowns of five-year-old Norway spruce indicated that foliar uptake in mature forests probably constitutes only a small percentage of annual nitrogen uptake2.

Date: 1999
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DOI: 10.1038/23178

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