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| Citation: | Jiao Hengchen, Wang Panpan, Jian Huimin, Yao Qingzhen. Simulation study of the effects of sediment resuspension on phosphate loading in the Changjiang Estuary and its adjacent area[J]. Haiyang Xuebao, 2017, 39(4): 28-38. doi: 10.3969/j.issn.0253-4193.2017.04.003
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Two core sediment were collected in the Changjiang Estuary and its adjacent area as study areas. The SEDEX method was applied to determined the forms of phosphorus in the sediments. Effects of sediment resuspension on the phosphate in the water column was studied. The results indicated that Detrital P was the highest form, which accounted for above 50% of TP. The contents of organic P and refractory P were also higher than other forms. Bioavailable P was accounted for 21% of TP. Organic P was the major part of bioavailable P. The concentrations of phosphate in overlying water was significantly higher when sediment resuspension occurred. It shows that sediment resuspension can cause the phosphourus in sediment to release. The increase of phosphate concentration in water mainly comes from the release of phosphorus in sediments. And the contribution of phosphate interstitial water is less than sediments. In addition, It is more favorable to the release of phosphorus in sediment resuspension in the anaerobic condition than that in the aerobic condition.
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