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- Title
Nitrogen fixation in a subarctic mire.
- Authors
Granhall, Ulf; Selander, Hans
- Abstract
An investigation of biological fixation of atmospheric nitrogen in situ, as part of the Swedish IBP Tundra Slum. Project, was carried out during the summer of 1971. The main site was a subarctic - continental, ombrotrophic mire with permafrost, situated near Abisko in Lappland (northern Sweden). Low nitrogen fixation, mainly by aerobic bacteria, occurred in elevated (ombroa-trophic) areas of the mire. In large wet depressions and pools, on the other hand, fixation by blue-green algae was quite appreciable. The algae were found to be epiphytically or intracellularly associated with Sphagnum and Drepanocladus mosses. Lichens with blue-green algal phycobionts or cephaiodia are rare at the investigated site, and the few plants tested showed comparatively small activity, probably due to poor nutritional status (ombrotrophic conditions). In other parts of the Tonetrask area they are however considered to be of great importance.
- Subjects
NITROGEN fixation; LICHENS; NITROGEN; PHYTOPLANKTON; BIOGEOCHEMICAL cycles; SURFACE tension
- Publication
Oikos, 1973, Vol 24, Issue 1, p8
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3543247