Turnover of DNA-P and phospholipid-P in lake sediments
2014 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 119, no 1-3, 361-370 p.Article in journal (Refereed) Published
Identifying and quantifying the forms of phosphorus (P) in lake sediments is a prerequisite for understanding lake trophic status and possible exports of P downstream. Organic P is one of the most important P forms found in the sediment, where orthophosphate diesters, including DNA and phospholipids, represent a degradable P pool that can support primary production and eutrophication. In this study, sediment cores from the eutrophic Lake Erken and the oligotrophic Lake Ånnsjön, both in steady state regarding long-term P input revealed trends in the degradation of DNA-P and PL-P with sediment depth. Comparisons were performed based on the differentiation of essentially permanent or recalcitrant P and temporary, potentially mobile P for the respective fractions. The temporary P pool was defined as the part of the total P pool calculated for values higher than the level at which the measured P concentration converged to a constant value and the recalcitrant pool was defined as the difference between the total and the temporary. The temporary diester-P pool comprised over 20 % of the total temporary P in Lake Erken and around 4 % in Lake Ånnsjön. The decrease in P concentrations with depth was more rapid for DNA-P compared to PL-P in both lakes, suggesting that DNA-P has a more prominent role in internal loading. The study shows that P mobilization potential can be different for different P fractions, which is important when assessing their contribution to internal loading of P within an aquatic system.
Place, publisher, year, edition, pages
2014. Vol. 119, no 1-3, 361-370 p.
Phosphorus turnover; Sediment; DNA; Phospholipids; Erken; Ã
Earth and Related Environmental Sciences Chemical Sciences
IdentifiersURN: urn:nbn:se:uu:diva-224699DOI: 10.1007/s10533-014-9972-3ISI: 000336028400023OAI: oai:DiVA.org:uu-224699DiVA: diva2:717999