Nitrogen Fixation in Wet Minerotrophic Moss Communities of a Subarctic Mire

Nitrogen fixation by blue-green algae associated with Sphagnum and Drepanocladus mosses growing in wet depressions and pools was studied in minerotrophic parts of the Stordalen mire in Swedish Lapland. Nitrogen fixation rates of 0.5-6.4 g m-2 yr-1 were estimated on Sphagnum riparium with the acetyle...

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Bibliographic Details
Published in:Oikos 1978-01, Vol.31 (2), p.236-246
Main Authors: Basilier, Karl, Granhall, Ulf, Stenström, Thor-Axel
Format: Article
Language:English
Subjects:
Algae
Alkynes
Growing seasons
Light
Mosses
Nitrogen fixation
Plant growth
Plants
Surface water
Tundras
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Summary:Nitrogen fixation by blue-green algae associated with Sphagnum and Drepanocladus mosses growing in wet depressions and pools was studied in minerotrophic parts of the Stordalen mire in Swedish Lapland. Nitrogen fixation rates of 0.5-6.4 g m-2 yr-1 were estimated on Sphagnum riparium with the acetylene reduction method. Fixation varied considerably along moss plants and for Sphagnum was found to be lower on apical and non-green parts. Fixation was higher at the periphery of a moss community. Activity was strongly light dependent and seemed little affected by pH-variations between pH 4.3-6.8. A daily fixation maximum around noon, and an annual maximum around the middle of the growing season, were indicated. /// Фиксация азота сине-зелеными, вдорослямн, связанными с мхами Sphagnum и Drepanocladus, растущимми в мокрых понижениях и лужах, исследованы в минеротрофных частях Стордаленского болота в Шведской Лапландии. Интенсивность фиксации азота составляет 0,5 - 6,4 г/ M2 по измерениям на Sphagnum riparium методом восстановления ацетилена. Интенсивность фиксации сильно различается в разных частях мха и у Sphagnum уменьшается по направлению к апикальному концу и незеленьм частям. Фиксация повышается на периферии моховых ассоциаций. Активность сильно зависит от освещенности, но слабо нзменяется при колебаниях pH в пределах 4,3 - 6,8. Дневиой максимум фиксации наблюдается около полудня, а годовой максимум - примерно в середине вегетационного периода.
ISSN:0030-1299
1600-0706
DOI:10.2307/3543568