Degradation rates of organic phosphorus in lake sediment
2007 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 82, no 1, 15-28 p.Article in journal (Refereed) PublishedText
Phosphorus (P) binding groups were identified in phytoplankton, settling particles, and sediment profiles by P-31 NMR spectroscopy from the Swedish mesotrophic Lake Erken. The P-31 NMR analysis revealed that polyphosphates and pyrophosphates were abundant in the water column, but rapidly mineralized in the sediment. Orthophosphate monoesters and teichoic acids degraded more slowly than DNA-P, polyphosphates, and P lipids. Humic acids and organic acids from phytoplankton were precipitated from the NaOH extract by acidification and identified by P-31 NMR spectroscopy. The precipitated P was significantly more recalcitrant than the P compound groups remaining in solution, but does not constitute a major sink of P as it did not reach a stable concentration with depth, which indicates that it may eventually be degraded. Since P also precipitated from phytoplankton, the origin of humic-P can not be related solely to allochthonous P.
Place, publisher, year, edition, pages
Univ So Denmark, Inst Biol, DK-5230 Odense M, Denmark. Uppsala Univ, Dept Analyt Chem, S-75124 Uppsala, Sweden. Uppsala Univ, Dept Organ Chem, S-75124 Uppsala, Sweden. Uppsala Univ, Dept Limnol, S-75236 Uppsala, Sweden., 2007. Vol. 82, no 1, 15-28 p.
organic P, P-31 NMR, lake sediment, degradation rates
Research subject Limnology
IdentifiersURN: urn:nbn:se:umu:diva-113615DOI: 10.1007/s10533-006-9049-zISI: 000244070900002OAI: oai:DiVA.org:umu-113615DiVA: diva2:886070