Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bio-Resource Conservation and Exploitation, South China Agricultural University, Guangzhou 510642, China.
College of Marine Sciences, South China Agricultural University, Guangzhou 510642, China.
Int J Environ Res Public Health. 2020 Jun 19;17(12):4430. doi: 10.3390/ijerph17124430.
Surface sediment samples were collected from 19 sites throughout Daya Bay, China, to study the concentrations, and spatial distributions of different fractions of phosphorus through sequential extraction methods. Like many coastal and marine areas, De-P was the dominant form of P, contributing 47.5% of TP, followed by O-P, contributing 25.5% of TP. Ex-P and Fe-P contribute the lowest to TP. The concentration of sedimentary TP ranged from 290.3525.1 µg/g, with the average of 395.3 µg/g, which was a similar range to other estuaries and coastal areas. Based on the spatial distribution, Pearson correlation and Principal component analysis, different fractions of phosphorus showed different spatial distributions due to different sources. The molar ratio of organic carbon to phosphorus (TOC/O-P) ranged from 199 to 609, with the average of 413, which was much higher than the Redfield ratio, suggesting terrestrial sources of organic matter in Daya Bay surface sediment. The average bioavailable phosphorus was 149.6 µg/g and contributed 37.8% (24.656.0%) of TP, indicating that the surface sediments of Day Bay act as an important internal source of P.
从中国大亚湾的 19 个地点采集了表层沉积物样品，通过连续提取方法研究了不同形态磷的浓度和空间分布。与许多沿海和海洋地区一样，去磷是磷的主要存在形式，占总磷的 47.5%，其次是有机磷，占总磷的 25.5%。可交换磷和铁磷对总磷的贡献最低。沉积物总磷的浓度范围为 290.3525.1 µg/g，平均值为 395.3 µg/g，与其他河口和沿海地区相似。基于空间分布、皮尔逊相关性和主成分分析，由于不同的来源，不同形态的磷表现出不同的空间分布。有机碳与磷的摩尔比（TOC/O-P）范围为 199 至 609，平均值为 413，远高于 Redfield 比，表明大亚湾表层沉积物中的有机质来源于陆地。有效磷的平均含量为 149.6 µg/g，占总磷的 37.8%（24.656.0%），表明大亚湾表层沉积物是磷的一个重要内部来源。
