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根据2011年5月和8月东山湾及邻近海域的调查结果,选择10个与富营养化有关的参数,包括溶解无机氮(DIN)、溶解硅酸盐(DSi)、活性磷酸盐(SRP)、总氮(TN)、总磷(TP)、化学耗氧量(COD)、溶解有机碳(DOC)、总有机碳(TOC)、叶绿素a(Chl-a)和浮游植物丰富度(d)等,应用主成分分析(PCA)法对该海域富营养化特征进行研究。主成分分析表明,主成分1(PC1)表征了有机污染、浮游植物和总磷状况;主成分2(PC2)反映了硅和氮营养水平,主成分3(PC3)体现了SRP的特点。春、夏季PC1、PC2、PC3和综合主成分(CPC)的空间分布表明漳江口和八尺门养殖区邻近海域富营养化风险较高;各主成分与盐度的相关分析表明东山湾内富营养化压力主要来自漳江,夏季有所增强;有机污染物和浮游植物可能是控制东山湾海域春、夏季富营养空间分布的主要驱动因素。
Ten eutrophication-related parameters including dissolved inorganic nitrogen (DIN), dissolved silicate (DSi), reactive phosphate (SRP), phytoplankton TN, TP, COD, DOC, TOC, Chl-a, and phytoplankton abundance (d) The principal component analysis (PCA) method was used to study the characteristics of eutrophication in this area. Principal component analysis (PC1) indicated that PC1 characterizes the status of organic pollution, phytoplankton and total phosphorus. PC2 reflects the level of silicon and nitrogen nutrition, while PC3 reflects the characteristics of SRP. The spatial distribution of PC1, PC2, PC3 and CPC in spring and summer showed that there was a high risk of eutrophication in the estuaries of Zhangjiang estuary and Bafangmen aquaculture area. Correlation analysis of principal components and salinity showed that the eutrophication The pressure is mainly from the Zhangjiang River and increased in summer. Organic pollutants and phytoplankton may be the main driving forces for controlling the spatial distribution of eutrophication in spring and summer in Dongshan Bay.