Factors affecting the internal loading of phosphorus from calcareous sediments of Baiyangdian Lake in North China |
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| Authors: | Li Ming Dong Zhi Feng Yang Xin Hui Liu |
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| Institution: | (1) State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, People’s Republic of China;(2) School of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing, 100048, People’s Republic of China; |
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| Abstract: | Phosphorus (P) is the limiting macronutrient for primary production in most lakes. Sediment characteristics are strongly correlated
to the internal P loading in lakes. This study investigated speciation of P, Fe, Al, and Ca in sediments of six sampling sites
with varying trophic status in Baiyangdian Lake of North China during the period of July 2008 and March 2009. The results
of sequential extraction experiments of the top sediments showed that total extractable P ranged approximately from 13 to
28 μmol g−1 for all sampling sites and the rank order of P-fractions was HCl–P > NaOH85–P > NaOH25–P > BD–P > NH4Cl–P. BD–P and BD–Fe had a consistent change with seasons. Their concentrations were both much higher in early spring and
mid-autumn. BD–Fe, Al extracted with NaOH at 25°C and 85°C affected corresponding P concentration in sediments, while high
concentration of extractable Ca from sediments showed no direct effects. According to the Kopáček et al. model of the molar
ratios of Al:Fe and NaOH25–Al]:NH4Cl–P + BD–P], there was potential P release from sediments twice a year for some hypereutrophic sites in early spring and
mid-autumn, especially in the former season. |
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