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Occurrence of water phosphorus at the water-sediment interface of a freshwater shallow lake: Indications of lake chemistry
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2017 (English)In: Ecological Indicators, ISSN 1470-160X, E-ISSN 1872-7034, Vol. 81, p. 443-452Article in journal (Refereed) Published
Abstract [en]

Better understanding of the occurrence of water phosphorus (P) at the water-sediment interface is vital to clarify P sources of origin in freshwater shallow lake ecosystems. This study focused on water-sediment interface systems and explored implicit indications of lake chemistry on water P based on a case study of Baiyangdian Lake, North China. 20 variables from 14 sampling sites collected for six months in two years were investigated, including sequentially extracted P fractions. Exploratory data analysis with multivariate statistical techniques and the index of P maximum solubilization potential were employed to examine interactions of water P and coexisting chemicals, and to accomplish pattern recognition of water-sediment interface systems. Results showed that nine key variables (temperature, conductivity, ammonium nitrogen, total nitrogen, sediment total P, metallic oxide bound P, organic P, aluminum and ferrum) were identified and ranked into four latent parameters (physical factors, nutrients, P species, and metals), accounting for 81% of water P variation. Accordingly, the recognized three patterns of water-sediment interface unraveled spatial partitioning for the domination of external or internal P sources. Four variables (temperature, sediment total P, metallic oxide bound P and organic P) were competent to classify patterns of water-sediment interface with 100% correct assignment of cases. Using two parameters (organic P and metallic oxide bound P), discriminant functions produced 85.7% correct assignations, indicating the importance of the two P species in explaining spatial heterogeneity of water P under oxic and alkaline circumstances. This study provides an operational zoning frame and implications for eutrophication management applicable to freshwater shallow lakes.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 81, p. 443-452
Keywords [en]
Water phosphorus, Lake chemistry, Phosphorus fractionation, Exploratory data analysis, Water-sediment interface
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:umu:diva-143593DOI: 10.1016/j.ecolind.2017.06.006ISI: 000417229100043OAI: oai:DiVA.org:umu-143593DiVA, id: diva2:1171022
Available from: 2018-01-05 Created: 2018-01-05 Last updated: 2018-06-09Bibliographically approved

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Tysklind, Mats

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