The nitrogen fixation potential of arctic cryptogram species is influenced by enhanced UV-B radiation
Solheim, Bjørn ; Johanson, Ulf ; Callaghan, Terry V. ; Lee, John A. ; Gwynn-Jones, Dylan and Björn, Lars Olof LU
(2002)
In Oecologia
133(1).
p.90-93
- Abstract
- Abstract. Effects of enhanced UV-B (representing a 15% ozone depletion) on cyanobacterial nitrogen fixation were measured at a high arctic site (Adventdalen, 79°N, Svalbard) and a subarctic site (Abisko, 68°N, Sweden). Nitrogen fixation potential (acetylene reduction) by cyanobacteria associated with the moss Sanionia uncinata in vegetation exposed to experimentally enhanced levels of UV-B for 3 and 4 years in the high arctic in Adventdalen was reduced by 50% compared to controls after 3 years. No reduction in nitrogen fixation potential was observed in cyanobacteria associated with the moss Hylocomium splendens when previously exposed to enhanced UV-B in Abisko for a 7-year period. However, in the same experiment a 50% increase in summer... (More)
- Abstract. Effects of enhanced UV-B (representing a 15% ozone depletion) on cyanobacterial nitrogen fixation were measured at a high arctic site (Adventdalen, 79°N, Svalbard) and a subarctic site (Abisko, 68°N, Sweden). Nitrogen fixation potential (acetylene reduction) by cyanobacteria associated with the moss Sanionia uncinata in vegetation exposed to experimentally enhanced levels of UV-B for 3 and 4 years in the high arctic in Adventdalen was reduced by 50% compared to controls after 3 years. No reduction in nitrogen fixation potential was observed in cyanobacteria associated with the moss Hylocomium splendens when previously exposed to enhanced UV-B in Abisko for a 7-year period. However, in the same experiment a 50% increase in summer precipitation stimulated nitrogen fixation potential by up to 6-fold above the natural precipitation treatments both in cyanobacteria associated with vegetation exposed to natural and enhanced UV-B radiation. In contrast to the lack of UV effect on moss-associated nitrogen fixation at the subarctic site, nitrogen fixation potential by the dominant lichen species Peltigera aphthosa was reduced by 50% when measured after 8 years exposure to elevated UV-B treatment. Evidence from these studies highlights the importance of UV-B radiation for cyanobacterial nitrogen fixation in the Arctic and future impact on nitrogen availability in such plant communities. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/134355
- author
- Solheim, Bjørn
; Johanson, Ulf
; Callaghan, Terry V.
; Lee, John A.
; Gwynn-Jones, Dylan
and Björn, Lars Olof
LU
- organization
- publishing date
- 2002
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Oecologia
- volume
- 133
- issue
- 1
- pages
- 90 - 93
- publisher
- Springer
- external identifiers
-
- wos:000178224300012
- scopus:0036934269
- ISSN
- 1432-1939
- DOI
- 10.1007/s00442-002-0963-z
- project
- Photobiology
- language
- English
- LU publication?
- yes
- id
- 61292fd8-fceb-4ecb-a463-4eac9ab77882 (old id 134355)
- date added to LUP
- 2016-04-01 17:00:49
- date last changed
- 2022-02-28 01:15:26
@article{61292fd8-fceb-4ecb-a463-4eac9ab77882,
abstract = {{Abstract. Effects of enhanced UV-B (representing a 15% ozone depletion) on cyanobacterial nitrogen fixation were measured at a high arctic site (Adventdalen, 79°N, Svalbard) and a subarctic site (Abisko, 68°N, Sweden). Nitrogen fixation potential (acetylene reduction) by cyanobacteria associated with the moss Sanionia uncinata in vegetation exposed to experimentally enhanced levels of UV-B for 3 and 4 years in the high arctic in Adventdalen was reduced by 50% compared to controls after 3 years. No reduction in nitrogen fixation potential was observed in cyanobacteria associated with the moss Hylocomium splendens when previously exposed to enhanced UV-B in Abisko for a 7-year period. However, in the same experiment a 50% increase in summer precipitation stimulated nitrogen fixation potential by up to 6-fold above the natural precipitation treatments both in cyanobacteria associated with vegetation exposed to natural and enhanced UV-B radiation. In contrast to the lack of UV effect on moss-associated nitrogen fixation at the subarctic site, nitrogen fixation potential by the dominant lichen species Peltigera aphthosa was reduced by 50% when measured after 8 years exposure to elevated UV-B treatment. Evidence from these studies highlights the importance of UV-B radiation for cyanobacterial nitrogen fixation in the Arctic and future impact on nitrogen availability in such plant communities.}},
author = {{Solheim, Bjørn and Johanson, Ulf and Callaghan, Terry V. and Lee, John A. and Gwynn-Jones, Dylan and Björn, Lars Olof}},
issn = {{1432-1939}},
language = {{eng}},
number = {{1}},
pages = {{90--93}},
publisher = {{Springer}},
series = {{Oecologia}},
title = {{The nitrogen fixation potential of arctic cryptogram species is influenced by enhanced UV-B radiation}},
url = {{http://dx.doi.org/10.1007/s00442-002-0963-z}},
doi = {{10.1007/s00442-002-0963-z}},
volume = {{133}},
year = {{2002}},
}