Quantifying nitrogen-fixation in feather moss carpets of boreal forests
2002 (English)In: Nature, ISSN 0028-0836, Vol. 419, no 6910, 917-920 p.Article in journal (Refereed) Published
Biological nitrogen (N) fixation is the primary source of N within natural ecosystems(1), 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 plants(1-6). With the exception of scattered stands of alder in early primary successional forests(7), N-fixation in boreal forests is considered to be extremely limited. Nitrogen-fixation in northern European boreal forests has been estimated(2) at only 0.5 kg Nha(-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-fixation(1,9). 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.
Place, publisher, year, edition, pages
2002. Vol. 419, no 6910, 917-920 p.
IdentifiersURN: urn:nbn:se:umu:diva-44757DOI: 10.1038/nature01051ISI: 000178909700041OAI: oai:DiVA.org:umu-44757DiVA: diva2:424370