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Effects of N :
Effects of N : P loading ratios on phytoplankton community composition, primary production and N fixation in a eutrophic lake
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Vrede, T (författare)
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Ballantyne, A (författare)
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Mille-Lindblom, C (författare)
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Algesten, G (författare)
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- Gudasz, Cristian, 1973- (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,ARCUM,Climate Impacts Research Centre (CIRC)
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Lindahl, S (författare)
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Brunberg, A K (författare)
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(creator_code:org_t)
- Blackwell Publishing Ltd, 2009
- 2009
- Engelska.
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Ingår i: Freshwater Biology. - : Blackwell Publishing Ltd. ; 54:2, s. 331-344
- Relaterad länk:
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http://onlinelibrary...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 1. The aim of this study was to assess the effects of different nitrogen (N) to phosphorus (P) loading ratios on phytoplankton community composition and primary production in a naturally eutrophic lake. Furthermore, the sources of N fuelling primary production were estimated using (15)N stable isotope tracers.2. A mesocosm experiment was performed with the same amount of P added to all mesocosms (similar to internal loading rates) but with a range of N additions (0-86 mu m N), resulting in a gradient of N : P supply ratios.3. Low N : P supply ratios resulted in a significant shift in the phytoplankton assemblage to a community dominated by N-fixing cyanobacteria and a supply of atmospheric N(2) estimated to be up to 60% of total supply.4. The N : P loading ratio had no significant effect on primary production, total nitrogen (TN) concentration or particulate N concentration.5. Our results imply that a reduced N : P ratio of the nutrient load does not necessarily result in a lower TN concentration and downstream N export due to compensation by N-fixing cyanobacteria.
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- art (ämneskategori)
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