| 厦门潮间带沉积物磷、铁和硫的时空分布及磷释放风险研究 |
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| 引用本文： | 潘峰,郭占荣,蔡宇,刘花台,王新红.厦门潮间带沉积物磷、铁和硫的时空分布及磷释放风险研究[J].海洋学报,2021,43(4):14-26. |
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| 作者姓名： | 潘峰 郭占荣 蔡宇 刘花台 王新红 |
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| 作者单位： | 1.厦门大学 环境与生态学院，福建 厦门 361102 |
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| 基金项目： | 国家自然科学基金（41372242，41672226）；中国博士后科学基金（2020M682085）。 |
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| 摘 要： | 为了解潮间带沉积物中铁和硫的氧化还原过程以及上覆水缺氧等对磷再活化和释放的影响，选择厦门翔安海岸带，应用原位、高分辨采样技术，对沉积物、孔隙水以及上覆水进行为期1 a的连续采样和监测。结果表明:上覆海水缺氧和磷含量超标较为严重，二者在多数月份分别低于2 mg/L和高于0.06 mg/L；在垂向剖面上，孔隙水中溶解活性磷含量同溶解铁含量变化规律一致，而薄膜扩散梯度技术有效态磷和有效态硫含量在局部硫高值区分布一致，表明磷的钝化和再活化主要受控于铁，局部受控于硫的氧化还原过程；在季度变化上，孔隙水中溶解活性磷同上覆水中溶解活性磷含量比较一致，归因于缺氧的沉积环境有利于溶解活性磷的跨界面交换，而多种环境因素的叠加，影响着溶解活性磷和膜扩散梯度技术有效态磷的时空变化；表层孔隙水中磷含量梯度不显著，即磷的释放风险不大，但环境因素的变化极易触发内源磷的释放。
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| 关 键 词： | 活性磷 溶解铁 溶解硫化物 薄膜扩散梯度技术 高分辨渗析技术 时空分布 |
| 收稿时间： | 2020-08-17 |
Spatio-temporal variation of phosphorus,iron and sulfur in intertidal sediments of Xiamen and associated release risk of phosphorus |
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| Institution: | 1.College of the Environment & Ecology, Xiamen University, Xiamen 361102, China2.College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China3.State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China |
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| Abstract: | For understanding the effects of iron and sulfur redox processes and overlying water hypoxia on phosphorus remobilization and liberation in intertidal sediments, the coastal zone in Xiang’an, Xiamen was selected to conduct continuous sampling and monitoring for sediments, pore water and overlying water in one year by employing the in-situ high resolution sampling techniques. Results showed that hypoxia and excessive phosphorus content were severe in the overlying water, which were below 2 mg/L and above 0.06 mg/L in most months, respectively. On the vertical profile, the distribution trend of dissolved reactive phosphorus (SRP) content was consistent with that of dissolved iron content in pore water, while the distribution trend of DGT-labile P was consistent with that of DGT-labile S in local, demonstrating that the passivation and remobilization of phosphorus are mainly controlled by the redox process of iron, and locally controlled by the redox process of sulfur. However, deficiency of sediment phosphorus limits the content of phosphorus in the deep reduction zone. In terms of quarterly changes, SRP content in pore water is only consistent with SRP content in overlying water, which is attributed to the hypoxic sedimentary environment favoring the cross-boundary exchange of SRP. However, the superposition of a variety of environmental factors affects the spatiotemporal changes of SRP and DGT-labile P. The SRP content concentration gradient in surface pore water was not significant, that is, the phosphorus release risk was not significant, but the change of environmental factors is very easy to trigger the release of endogenous phosphorus in future. |
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