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Variation in moss-associated nitrogen fixation in boreal forest stands

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Abstract

Traditionally it has been thought that most boreal forest communities lack a significant input of biologically fixed nitrogen. Recent discoveries of nitrogen fixation by cyanobacteria associated with mosses have resulted in a re-evaluation of this view. While it is recognized that rates of nitrogen fixation in mosses can be highly variable, there is little understanding as to why this occurs. I monitored nitrogen fixation, using acetylene reduction, in wet lowland and dry upland boreal forest communities, in central Canada, over a growing season. At the peak of nitrogen fixation in mid summer, Sphagnum capillifolium had an 11 times higher rate of fixation than Pleurozium schreberi. Variation in canopy openness and precipitation had no effect on rates of fixation over the growing season. In P. schreberi fixation rates did not vary between sites. Temperature had a positive effect on fixation rates in both S. capillifolium and P. schreberi, but the effect was 4 times more pronounced in S. capillifolium. Seasonal rates of nitrogen fixation were estimated at 193 mg N m−2 for S. capillifolium and 23 mg N m−2 for P. schreberi. With moderate increases in climate warming, predicted increases in nitrogen fixation in S. capillifolium are sufficient to raise its decomposition rate. Increased temperatures may therefore act synergistically to change boreal systems from a sink to a source of carbon.

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Acknowledgments

This study was supported by a NSERC Discovery grant to the author. Mike Martin helped with the analysis of the samples. Sara Halwas and two anonymous reviewers improved an earlier version of this manuscript. This experiment complied with Canadian law.

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  1. Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada

    John H. Markham

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  1. John H. Markham
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Correspondence to John H. Markham.

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Communicated by Hakan Wallander.

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Markham, J.H. Variation in moss-associated nitrogen fixation in boreal forest stands. Oecologia 161, 353–359 (2009). https://doi.org/10.1007/s00442-009-1391-0

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  • DOI: https://doi.org/10.1007/s00442-009-1391-0

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