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Across-Habitat Comparison of Diazotroph Activity in the Subarctic
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap.
Ansvarlig organisasjon
2015 (engelsk)Inngår i: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, Vol. 69, nr 4, s. 778-787Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Nitrogen (N) fixation by N-2-fixing bacteria (diazotrophs) is the primary N input to pristine ecosystems like boreal forests and subarctic and arctic tundra. However, the contribution by the various diazotrophs to habitat N-2 fixation remains unclear. We present results from in situ assessments of N-2 fixation of five diazotroph associations (with a legume, lichen, feather moss, Sphagnum moss and free-living) incorporating the ground cover of the associations in five typical habitats in the subarctic (wet and dry heath, polygon-heath, birch forest, mire). Further, we assessed the importance of soil and air temperature, as well as moisture conditions for N-2 fixation. Across the growing season, the legume had the highest total as well as the highest fraction of N-2 fixation rates at habitat level in the heaths (> 85 % of habitat N-2 fixation), whereas the free-living diazotrophs had the highest N-2 fixation rates in the polygon heath (56 %), the lichen in the birch forest (87 %) and Sphagnum in the mire (100 %). The feather moss did not contribute more than 15 % to habitat N-2 fixation in any of the habitats despite its high ground cover. Moisture content seemed to be a major driver of N-2 fixation in the lichen, feather moss and free-living diazotrophs. Our results show that the range of N-2 fixers found in pristine habitats contribute differently to habitat N-2 fixation and that ground cover of the associates does not necessarily mirror contribution.

sted, utgiver, år, opplag, sider
2015. Vol. 69, nr 4, s. 778-787
Emneord [en]
Boreal forest, Cyanobacteria, Heterotrophs, Methanotrophs, N deposition, Nitrogen fixation, barctic tundra, Symbiosis
HSV kategori
Identifikatorer
URN: urn:nbn:se:polar:diva-3450DOI: 10.1007/s00248-014-0534-yISI: 000353295800006PubMedID: 25403111OAI: oai:DiVA.org:polar-3450DiVA, id: diva2:1079883
Tilgjengelig fra: 2015-05-29 Laget: 2017-03-09 Sist oppdatert: 2017-11-29

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