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Phosphorus speciation and changes with depth in the sediment of Lake Illawarra, New South Wales, Australia

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Abstract

In order to better understand phosphorus (P) cycling and origins in the sediment of the Lake Illawarra, two sediment cores were extracted in November, 2010 and a modified sequential extraction scheme (SEDEX) was used to profile the exchangeable P (Pex), reactive Fe/Al-bound P (Preac), reductive Fe/Al-bound P (Predu), authigenic apatite P (Pauth), detrital P (Pdet), organic P (Porg) and residual P (Presi). The total sedimentary P (TP) ranged from 93 to 437 μg g−1, and was dominated by inorganic P. The average percentage of each fraction of P in the sediment followed the sequence: Preac (28.6 %) > Presi (23.5 %) > Pauth (19.1 %) > Predu (17.0 %) > Porg (4.9 %) > Pex (4.7 %) > Pdet (2.2 %). The profiles of TP and Porg showed two peak values with depth, which were matched to land use history in the Lake Illawarra catchment. The sediment depth profiles indicated that Fe oxyhydroxides play a predominant role in the P cycle in the sediments of the lagoon. This is supported by significant positive correlation between Preac and reactive Fe and a negative correlation between Pauth and Fe. Pauth and Preac concentrations were also well negatively correlated, possibly a result of competitive equilibrium between Fe and Ca for P. The estimated P burial efficiency was up to 82 % for this lagoon, which is likely related to the high sediment accumulation rate and the high value of R Fe-P. In addition, the bioavailable P, which consists of Pex, Preac, and Porg, represented a significant proportion of the sedimentary P pool, accounting, on average, for 38 % of the TP. This result indicates that the sediment is a potential internal source of P for this lake ecosystem.

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Acknowledgments

This study was supported by the GeoQuEST Research Centre, University of Wollongong, by a government Scholarship from Jiangsu Province, China for study abroad, by the National Natural Science Foundation of China (Project No. 41006040 and 41076119), by Natural science fund for colleges and universities in Jiangsu Province (Project No. 12KJD610005), and by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). We thank Paul Carr and Venera Espanon for assistance with the X-ray Fluorescence analysis at the University of Wollongong. Brian Jones and Brent Peterson kindly helped with the collection of samples and David Wheeler and Lili Yu assisted with sample preparation. Finally, CYW would like to thank all of the staff at School of Earth and Environmental Sciences, University of Wollongong, who made his visit enjoyable and productive.

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Correspondence to Changyou Wang.

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Wang, C., John Morrison, R. Phosphorus speciation and changes with depth in the sediment of Lake Illawarra, New South Wales, Australia. Environ Earth Sci 71, 3529–3541 (2014). https://doi.org/10.1007/s12665-013-2742-z

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