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Chen, MS,Ding, SM,Liu, L,Wang, Y,Xing, XG,Wang, D,Gong, MD,Zhang, CS
2016
December
Environmental Pollution
Fine-scale bioturbation effects of tubificid worm (Limnodrilus hoffrneisteri) on the lability of phosphorus in sediments
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WOS: 6 ()
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Bioturbation Sediment Phosphorus Zr-oxide DGT High resolution DISSOLVED REACTIVE PHOSPHORUS THIN-FILMS TECHNIQUE DIFFUSIVE GRADIENTS HIGH-RESOLUTION LAKE-SEDIMENTS PORE-WATER IN-SITU MARINE-SEDIMENTS ORGANIC-MATTER FRESH-WATER
219
604
611
This study investigated the effects of tubificid worm bioturbation on the lability of phosphorus (P) in microcosm sediments. High-resolution dialysis (HR-Peeper) and two types of diffusive gradients in thin films (DGT) (Zr-oxide DGT and ZrO-Chelex DGT) were used to measure soluble P and Fe, and labile P and Fe at a millimeter spatial scale. The worm bioturbation promoted P release (up to 511% of the control) to the overlying water on the 6th day, but it was reduced compared to the control (up to 171% of the control) from the 22nd day to the 102nd day because of the adsorption by Fe(II1) oxyhydroxides. The worm bioturbation reduced the pore water soluble P concentration up to 48% and the DGT-labile P concentration up to 29% of the control from a sediment depth of -10 mm to approximately -130 mm before the 22nd day of incubation due to worm ingestion of sediment particles. Two-dimensional measurements of DGT-labile P also showed a much lower concentration of labile P around the worm burrow. This effect disappeared on the 53rd and 102nd day. However, the soluble P and DGT-labile P decreased again up to 41% and 38%, compared to the control from the sediment depth of -20 mm and -10 mm to approximately -130 mm, respectively, on the 152nd day of incubation due to the adsorption by Fe(III) oxyhydroxides. Soluble Fe(II) and DGT-labile Fe did not show significant changes from the worm bioturbation on the 6th day, but decreased up to 31% and 47% of the control after the 6th day. The results that worm ingestion of sediment particles is a significant driver of soluble and labile P reduction in the sediments before the 22nd day. After that, soluble and labile P reduction was attributed to P adsorption by Fe(III) oxyhydroxides. (C) 2016 Elsevier Ltd. All rights reserved.
10.1016/j.envpol.2016.06.023
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