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Quantifying nitrogen-fixation in feather moss carpets of boreal forests

Nature volume 419, pages 917920 (31 October 2002) | Download Citation

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Abstract

Biological nitrogen (N) fixation is the primary source of N within natural ecosystems1, yet the origin of boreal forest N has remained elusive. The boreal forests of Eurasia and North America lack any significant, widespread symbiotic N-fixing plants1,2,3,4,5,6. With the exception of scattered stands of alder in early primary successional forests7, N-fixation in boreal forests is considered to be extremely limited. Nitrogen-fixation in northern European boreal forests has been estimated2 at only 0.5 kg N ha-1 yr-1; however, organic N is accumulated in these ecosystems at a rate of 3 kg N ha-1 yr-1 (ref. 8). Our limited understanding of the origin of boreal N is unacceptable given the extent of the boreal forest region, but predictable given our imperfect knowledge of N-fixation1,9. Herein we report on a N-fixing symbiosis between a cyanobacterium (Nostoc sp.) and the ubiquitous feather moss, Pleurozium schreberi (Bird) Mitt. that alone fixes between 1.5 and 2.0 kg N ha-1 yr-1 in mid- to late-successional forests of northern Scandinavia and Finland. Previous efforts have probably underestimated N-fixation potential in boreal forests.

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Acknowledgements

We thank R. Sheridan, B. Bergman, U. Rasmussen, and J. Johansen for their advice and assistance.

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Affiliations

  1. *School of Forestry, The University of Montana, Missoula, Montana 59812, USA

    • Thomas H. DeLuca
  2. †Department of Forest Vegetation Ecology, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden

    • Thomas H. DeLuca
    • , Olle Zackrisson
    •  & Marie-Charlotte Nilsson
  3. ‡Umeå Plant Science Center, Department of Plant Physiology, Umeå University, SE-901 87 Umeå, Sweden

    • Anita Sellstedt

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The authors declare that they have no competing financial interests.

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Correspondence to Thomas H. DeLuca.

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https://doi.org/10.1038/nature01051

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