长江口及邻近海域表层沉积物中营养元素的分布特征及其控制因素

Nutrient distribution and controlled factors at the surface sediment of the Changjiang Estuary and adjacent sea area

对2003年6月采集的长江口及邻近海域的24个表层沉积物样品进行分析,分别得到C、N、P三种营养元素的三种形态的含量,并由此得到不同形态营养元素的平面分布及其在总量中所占的份额,即ICI、P为C、P的优势形态,而ON为N的优势形态。在此基础上,进一步分析了影响不同营养元素分布的因素,得出上覆水体的温度、沉积物粒度以及水动力条件等对沉积物中营养元素的分布具有重要影响。

The distributions of three forms of carbon （inorganic, organic and total carbon）, nitrogen （inorganic, organic and total nitrogen） and phosphorus （inorganic, organic and total phosphorus） at the surface sediment were discussed through the analytical results of 24 sediment samples obtained from Changjiang Estuary and its adjacent sea area in Aug 2003. The results showed that inorganic carbon and inorganic phosphorus were the predominant forms of carbon and phosphorus respectively; while organic nitrogen was the predominant form of nitrogen. Based on that, the factors to affect the distributions of different forms of nutrients were discussed, and the distributions of nutrients were influenced greatly by the temperature of overlying water, the sediment grain size and the hydrodynamics at the surface sediments of the Changjiang Estuary and its adjacent sea area.