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Influences of phosphorus concentration and porewater advection on phosphorus dynamics in carbonate sands around the Weizhou Island, northern South China Sea.
Marine Pollution Bulletin ( IF 5.8 ) Pub Date : 2020-09-11 , DOI: 10.1016/j.marpolbul.2020.111668
Zhiming Ning 1 , Cao Fang 1 , Kefu Yu 1 , Bin Yang 2 , Solomon Felix Dan 2 , Ronglin Xia 1 , Yukun Jiang 1 , Ruihuan Li 3 , Yinghui Wang 1
Affiliation  

A series of flow-through reactor experiments were undertaken to assess the potential effect of porewater advection and dissolved inorganic phosphorus (DIP) concentration on benthic DIP dynamics in permeable sediments collected from the Weizhou Island, northern South China Sea. The flux of DIP ranged from −0.13 to 0.05 mmol m−2 h−1, and the reversal from DIP efflux to influx occurred when the DIP concentration reached a threshold. DIP release from the sediment into the seawater peaked at intermediate advection rate, which perhaps provide optimum conditions for DIP release related to CaCO3 dissolution. Phosphorus limitation in seawater could be relieved by DIP release from the sediment, and CaCO3-bound P in carbonate sands may play a major role in benthic DIP release and decrease in the molar nitrogen/phosphorus ratio in seawater around the Weizhou Island.



中文翻译:

磷浓度和孔隙水平流对南海北部Wei洲岛周围碳酸盐岩中磷动力学的影响。

进行了一系列流通反应器实验,以评估孔隙水平流和溶解性无机磷(DIP)浓度对从南海北部Wei洲岛采集的可渗透沉积物中底栖DIP动力学的潜在影响。DIP的通量在-0.13至0.05 mmol m -2  h -1的范围内,并且当DIP浓度达到阈值时,发生了从DIP外流到流入的逆转。从沉积物到海水中的DIP释放以中等对流速率达到峰值,这可能为与CaCO 3溶解有关的DIP释放提供了最佳条件。沉积物中的DIP释放和CaCO 3可以缓解海水中的磷限制碳酸盐砂中的磷结合可能在底栖DIP释放和and洲岛附近海水中氮/磷摩尔比降低中起主要作用。

更新日期:2020-09-12
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