Phosphorus Cycling between Sediment and Overlying Water in Ben Chifely Reservoir, Australia under Simulated Core Incubation

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Published: Apr 3, 2018
Keywords:
Phosphorus Sediment Overlying water Core incubation P fractions Oxic Anoxic

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AKM M Rahman
Department of Agriculture and Water Resources, Mascot, New South Wales 2020, Australia
Dhia Al Bakri
Facuty of Science, University of Sydney, Camperdown, New South Wales 2050, Australia

Abstract

The flux of soluble reactive phosphorus (SRP) was estimated under simulated oxic, anoxic and aerated conditions in sediment cores collected from two sites in a meso-eutrophic reservoir that differ in depth and limnological characteristics. Hypolimnetic accumulation and the concentration of P in various sediment fractions were also studied to determine the factors and processes influencing SRP flux at the sediment-water interface. The average release of SRP under anoxic incubation varied between 16 - 70 μmol/m2/day and 20 - 94 μmol/m2/day in shallow and deep-water sites respectively. On the other hand, SRP was almost entirely lost to the sediment during simulated oxic or aerated experiments. Temperature influence on P release from the sediment was significant and the increment is considerable at water temperature above 20oC. The reservoir sediment contained a large proportion of iron and aluminum bound P (Fe and Al-P). Fe and P ratio in the sediment exceeded 15 indicating high retention capacity of P by the sediment. Besides, the high amount of Fe and Al-P in the sediment reflects redox dependent P mobilization. Therefore, management needs targeting retention capacity of the sediment and alteration of anoxic condition in the hypolimnion during warmer months.

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How to Cite
Rahman, A. M., & Bakri, D. A. (2018). Phosphorus Cycling between Sediment and Overlying Water in Ben Chifely Reservoir, Australia under Simulated Core Incubation. Environment and Natural Resources Journal, 16(2), 11–19. Retrieved from https://ph02.tci-thaijo.org/index.php/ennrj/article/view/117645
Issue
Vol. 16 No. 2 (2018): Jul-Dec
Section
Original Research Articles

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