昌黎近岸表层沉积物中磷的赋存形态及其分布特征研究

本文以昌黎黄金海岸国家级自然保护区的海域为研究区域，分析讨论了沉积物的中值粒径、有机质总量与磷的各种不同赋存形态之间的相关性。结果表明，保护区海域各采样点沉积物的总磷（TP）含量在257.2×10-6~470.2×10-6之间，平均值为282.4×10-6；其中，有机磷（OP）含量为21.0×10-6~191.4×10-6；无机磷（IP）含量为106.2×10-6~214.6×10-6，是保护区沉积物中磷形态的主要赋存形态；铁/铝结合态磷（Fe/Al-P）的含量为17.2×10-6~55.9×10-6；钙结合态磷（Ca-P）含量为71.4×10-6~168.2×10-6，是组成IP的主要赋存形态，Ca-P含量及其所占比例均较高，磷释放风险较小。各磷形态含量的空间分布大体呈西部>中部>东部的趋势。部分距新开口较近的采样点含磷量偏高。北部区域主要受到陆源输入与水动力条件等因素的影响，含磷量偏低。从统计数据特征来看，该海域的沉积物基本没有构成污染。

The chemical speciation and distribution of phosphorus in sediments of the near shore in Changli

In this study, the sea area of Changli Gold Coast National Nature Reserve was chosen as the study area.The correlation between the median size of sediments, the total amount of organic matter and the various occurrences of phosphorus was analyzed.The results showed that the total phosphorus (TP) content of sediment in the sampling area waters of the reserve ranged from 257.2×10-6 to 470.2×10-6 with an average of 282.4×10-6.Among them, the contents of organic phosphorus (OP) ranged from 21.0×10-6 to 191.4×10-6.Inorganic phosphorus (IP) was the main speciation of phosphorus species in the sediments, with the content ranging from 106.2×10-6 to 214.6×10-6.The content of Fe/Al-P (Fe/Al-P) is 17.2×10-6~55.9×10-6.Calcium-bound phosphorus (Ca-P) is the dominant species of IP, with a content of 71.4×10-6~168.2×10-6.The content of Ca-P and its proportion are higher, and the risk of phosphorus release is lower.The spatial distribution of the content of phosphorus forms is basically the trend west > middle > east.Some samples relatively close to new openings have higher phosphorus content.The northern region is mainly affected by factors such as terrestrial input and hydrodynamic conditions, and the phosphorus content is low.According to the characteristics of statistical data, the sediment in this area is basically no pollution.