期刊
FRESHWATER BIOLOGY
卷 54, 期 2, 页码 331-344出版社
WILEY
DOI: 10.1111/j.1365-2427.2008.02118.x
关键词
N-15 stable isotopes; eutrophication; nitrogen; phosphorus; stoichiometry
资金
- MISTRA [98648, 000246-97-1]
- Oscar and Lili Lamm's foundation
- Helge Ax:son Johnson's foundation
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 N-15 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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