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The nitrogen fixati...
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Solheim, Bjørn
(författare)
The nitrogen fixation potential of arctic cryptogram species is influenced by enhanced UV-B radiation
- Artikel/kapitelEngelska2002
Förlag, utgivningsår, omfång ...
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2002-09-01
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Springer Science and Business Media LLC,2002
Nummerbeteckningar
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LIBRIS-ID:oai:lup.lub.lu.se:61292fd8-fceb-4ecb-a463-4eac9ab77882
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https://lup.lub.lu.se/record/134355URI
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https://doi.org/10.1007/s00442-002-0963-zDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
Anmärkningar
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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.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Johanson, Ulf
(författare)
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Callaghan, Terry V.
(författare)
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Lee, John A.
(författare)
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Gwynn-Jones, Dylan
(författare)
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Björn, Lars OlofLund University,Lunds universitet,Molekylär cellbiologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Molecular Cell Biology,Department of Biology,Faculty of Science(Swepub:lu)fysb-lob
(författare)
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Molekylär cellbiologiBiologiska institutionen
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Oecologia: Springer Science and Business Media LLC133:1, s. 90-931432-19390029-8549
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