Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska
The effects of variation in light intensity, temperature, and water content on rates of net photosynthesis and dark respiration have been investigated in two common tundra mosses, Polytrichum alpinum from drier habitats and Calliergon sarmentosum from wetter habitats at Barrow, Alaska. Optimum tempe...
Published in: | Canadian Journal of Botany |
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Canadian Science Publishing
1976
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Online Access: | http://nora.nerc.ac.uk/id/eprint/525718/ https://doi.org/10.1139/b76-148 |
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ftnerc:oai:nora.nerc.ac.uk:525718 2023-05-15T15:39:40+02:00 Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska Oechel, Walter C. Collins, Nigel J. 1976 http://nora.nerc.ac.uk/id/eprint/525718/ https://doi.org/10.1139/b76-148 unknown Canadian Science Publishing Oechel, Walter C.; Collins, Nigel J. 1976 Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska. Canadian Journal of Botany, 54 (12). 1355-1369. https://doi.org/10.1139/b76-148 <https://doi.org/10.1139/b76-148> Publication - Article PeerReviewed 1976 ftnerc https://doi.org/10.1139/b76-148 2023-02-04T19:49:32Z The effects of variation in light intensity, temperature, and water content on rates of net photosynthesis and dark respiration have been investigated in two common tundra mosses, Polytrichum alpinum from drier habitats and Calliergon sarmentosum from wetter habitats at Barrow, Alaska. Optimum temperatures for net photosynthesis of 10–15 °C for both species and saturating light intensities (photosynthetically active radiation (PhAR), 400–700 nm) of about 0.12 cal cm−2 min−1 for P. alpinum and 0.15 cal cm−2 min−1 for C. sarmentosum correlate well with measurements of light intensity and moss tissue temperatures made over the season at the collection site. It is suggested that depressions in net photosynthetic rates around midday might be caused by supraoptimal temperatures and possibly supraoptimal light intensities. Calliergon sarmentosum, a semiaquatic species required a higher water content (about 450% dry weight) than P. alpinum (about 200%) to reach maximal rates of net photosynthesis. Mean maximal rates of net photosynthesis ranged from about 2.6 to 4.4 mg CO2 g−1 dry weight h−1 for P. alpinum and from about 1.5 to 3.0 mg CO2 g−1 dry weight h−1 for C. sarmentosum. Predictions of net annual production have been made for both species. Predicted levels of 171 g C m−2 per 50-day season for C. sarmentosum compare well with results obtained for species of similar growth form elsewhere in polar regions. For P. alpinum the predicted level of 38.5 g C m−2 per 50-day season compares with observed dry matter production at the same site of 43 g m−2 per season. Article in Journal/Newspaper Barrow Tundra Alaska Natural Environment Research Council: NERC Open Research Archive Canadian Journal of Botany 54 12 1355 1369 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
The effects of variation in light intensity, temperature, and water content on rates of net photosynthesis and dark respiration have been investigated in two common tundra mosses, Polytrichum alpinum from drier habitats and Calliergon sarmentosum from wetter habitats at Barrow, Alaska. Optimum temperatures for net photosynthesis of 10–15 °C for both species and saturating light intensities (photosynthetically active radiation (PhAR), 400–700 nm) of about 0.12 cal cm−2 min−1 for P. alpinum and 0.15 cal cm−2 min−1 for C. sarmentosum correlate well with measurements of light intensity and moss tissue temperatures made over the season at the collection site. It is suggested that depressions in net photosynthetic rates around midday might be caused by supraoptimal temperatures and possibly supraoptimal light intensities. Calliergon sarmentosum, a semiaquatic species required a higher water content (about 450% dry weight) than P. alpinum (about 200%) to reach maximal rates of net photosynthesis. Mean maximal rates of net photosynthesis ranged from about 2.6 to 4.4 mg CO2 g−1 dry weight h−1 for P. alpinum and from about 1.5 to 3.0 mg CO2 g−1 dry weight h−1 for C. sarmentosum. Predictions of net annual production have been made for both species. Predicted levels of 171 g C m−2 per 50-day season for C. sarmentosum compare well with results obtained for species of similar growth form elsewhere in polar regions. For P. alpinum the predicted level of 38.5 g C m−2 per 50-day season compares with observed dry matter production at the same site of 43 g m−2 per season. |
format |
Article in Journal/Newspaper |
author |
Oechel, Walter C. Collins, Nigel J. |
spellingShingle |
Oechel, Walter C. Collins, Nigel J. Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska |
author_facet |
Oechel, Walter C. Collins, Nigel J. |
author_sort |
Oechel, Walter C. |
title |
Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska |
title_short |
Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska |
title_full |
Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska |
title_fullStr |
Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska |
title_full_unstemmed |
Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska |
title_sort |
comparative co2 exchange patterns in mosses from two tundra habitats at barrow, alaska |
publisher |
Canadian Science Publishing |
publishDate |
1976 |
url |
http://nora.nerc.ac.uk/id/eprint/525718/ https://doi.org/10.1139/b76-148 |
genre |
Barrow Tundra Alaska |
genre_facet |
Barrow Tundra Alaska |
op_relation |
Oechel, Walter C.; Collins, Nigel J. 1976 Comparative CO2 exchange patterns in mosses from two tundra habitats at Barrow, Alaska. Canadian Journal of Botany, 54 (12). 1355-1369. https://doi.org/10.1139/b76-148 <https://doi.org/10.1139/b76-148> |
op_doi |
https://doi.org/10.1139/b76-148 |
container_title |
Canadian Journal of Botany |
container_volume |
54 |
container_issue |
12 |
container_start_page |
1355 |
op_container_end_page |
1369 |
_version_ |
1766371702995943424 |