测定了珠江广州河段表层沉积物中营养物质的含量和粒径组分, 对营养物质的分布特点和粒度效应进行了研究。 结果表明在主干流河道沿程分布上, 各种营养物质整体上表现出明显的"低—高—低"型分布特点。有机质、全N和全P之间均呈现较明显的正相关关系, 特别是全N和有机质之间的相关系数达到0.950, 属于高度相关。 各营养物质与砂粒含量之间表现出一定的负相关性;各营养物质与粉砂含量之间表现出较明显的正相关性; 各营养物质与黏粒含量之间不存在显著相关性。 营养物质与粒径组分之间的这种关系将丰富沉积物中污染物分布"粒度控制规律"的内容。
Nutrients and particle size composition in surface sediments in the Guangzhou section of the Pearl River were measured. Granularity effect and distribution characteristics of nutrients were studied.Results showed that all of the nutrients appeared the distribution characteristics of "low-high-low" on longitudinal distribution in trunk stream on whole. There were significant positive correlations among organic matter, to-tal nitrogen,and total phosphorus.Total nitrogen was highly linearly correlated with organic matter,with regression coefficient reaching 0.950. Nutrients were significantly negatively correlated with sand fraction and positively correlated with powder sand fraction. However, nutrients were not significantly correlated with clay fraction.The correlations between nutrients and particle size composition would enrich the content of granularity effect of pollutants in sediment.