Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief
A study to estimate nitrogen fixation input in arctic coastal tundra was carried out using the acetylene reduction assay. Areal estimation was attempted by high intensity sampling over a limited area of tundra containing both high-centred and low-centred polygons with their corresponding variations...
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The Arctic Institute of North America
1973
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ftunivcalgaryojs:oai:journalhosting.ucalgary.ca:article/65959 2023-05-15T14:19:19+02:00 Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief Schell, Donald M. Alexander, Vera 1973-01-01 application/pdf https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65959 eng eng The Arctic Institute of North America https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65959/49873 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65959 ARCTIC; Vol. 26 No. 2 (1973): June: 89–176; 130-137 1923-1245 0004-0843 Active layer info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research-article 1973 ftunivcalgaryojs 2022-03-22T21:22:54Z A study to estimate nitrogen fixation input in arctic coastal tundra was carried out using the acetylene reduction assay. Areal estimation was attempted by high intensity sampling over a limited area of tundra containing both high-centred and low-centred polygons with their corresponding variations in micro-vegetation. The highest average rates of acetylene reduction were obtained from cores in damp interpolygonal troughs (10.50 µmoles ethylene/m²-hr) where mats of the blue-green alga Nostoc were abundant. Wet moss-algal associations in hydric meadows showed high nitrogenase activity (average 6.86 µmoles ethylene/m²-hr) and dry high-centred polygons were comparatively inactive (2.80 µmoles ethylene/m²-hr). The lichens Peltigera sp. and Stereocaulon sp. were the most active nitrogen fixers in the drier tundra. Nitrogen fixation increased with rising temperature with a measured Q10 for Nostoc commune of 3.7. Article in Journal/Newspaper Arctic Arctic Tundra University of Calgary Journal Hosting Arctic ARCTIC 26 2 |
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English |
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Active layer Schell, Donald M. Alexander, Vera Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief |
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description |
A study to estimate nitrogen fixation input in arctic coastal tundra was carried out using the acetylene reduction assay. Areal estimation was attempted by high intensity sampling over a limited area of tundra containing both high-centred and low-centred polygons with their corresponding variations in micro-vegetation. The highest average rates of acetylene reduction were obtained from cores in damp interpolygonal troughs (10.50 µmoles ethylene/m²-hr) where mats of the blue-green alga Nostoc were abundant. Wet moss-algal associations in hydric meadows showed high nitrogenase activity (average 6.86 µmoles ethylene/m²-hr) and dry high-centred polygons were comparatively inactive (2.80 µmoles ethylene/m²-hr). The lichens Peltigera sp. and Stereocaulon sp. were the most active nitrogen fixers in the drier tundra. Nitrogen fixation increased with rising temperature with a measured Q10 for Nostoc commune of 3.7. |
format |
Article in Journal/Newspaper |
author |
Schell, Donald M. Alexander, Vera |
author_facet |
Schell, Donald M. Alexander, Vera |
author_sort |
Schell, Donald M. |
title |
Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief |
title_short |
Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief |
title_full |
Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief |
title_fullStr |
Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief |
title_full_unstemmed |
Nitrogen Fixation in Arctic Coastal Tundra in Relation to Vegetation and Micro-Relief |
title_sort |
nitrogen fixation in arctic coastal tundra in relation to vegetation and micro-relief |
publisher |
The Arctic Institute of North America |
publishDate |
1973 |
url |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65959 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Tundra |
genre_facet |
Arctic Arctic Tundra |
op_source |
ARCTIC; Vol. 26 No. 2 (1973): June: 89–176; 130-137 1923-1245 0004-0843 |
op_relation |
https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65959/49873 https://journalhosting.ucalgary.ca/index.php/arctic/article/view/65959 |
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ARCTIC |
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26 |
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1766290999381852160 |