Li Zhaoran, Sheng Yanqing, Yang Jian, Burton Edward D
Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
Mar Pollut Bull. 2016 Dec 15;113(1-2):176-181. doi: 10.1016/j.marpolbul.2016.09.007. Epub 2016 Sep 7.
The release of phosphorus (P) from benthic sediments can affect the P content, nutrient status and quality of overlying waters in coastal ecosystem. This study was carried out to investigate the influence of oxidation-reduction potential (ORP) and sulfide on P release from sediments in the coastal estuary of the Yuniao River, China. The results showed that ferric iron-bound P was the main P burial phase in the sediments. The P concentration in overlying water increased with ORP decrease and sulfide increase, displaying a significant linear correlation with the ORP and sulfide concentration. The results indicate that decreased ORP may elevate the zero equilibrium phosphorus concentration, enhancing the capability of P release. And increased sulfide may react or capture reactive iron in sediments, reducing the P adsorption capacity and accelerating P release. Therefore, the control of ORP and sulfide production is important in the sink/source conversion of P in coastal sediments.
底栖沉积物中磷（P）的释放会影响沿海生态系统中上层水体的磷含量、营养状况和水质。本研究旨在调查氧化还原电位（ORP）和硫化物对中国云鸟河河口海岸带沉积物中磷释放的影响。结果表明，铁结合态磷是沉积物中主要的磷埋藏形态。随着ORP的降低和硫化物含量的增加，上覆水中的磷浓度升高，与ORP和硫化物浓度呈显著线性相关。结果表明，ORP降低可能会提高磷的零平衡浓度，增强磷的释放能力。而硫化物含量增加可能会与沉积物中的活性铁发生反应或捕获活性铁，降低磷的吸附能力并加速磷的释放。因此，控制ORP和硫化物的产生对于沿海沉积物中磷的源/汇转换至关重要。
