大沽河—胶州湾段溶解有机物类腐殖质荧光特征变化

利用荧光激发-发射矩阵光谱(excitation-emission matrix spectroscopy,EEMS)技术研究了溶解有机物类腐殖质荧光特征从大沽河到胶州湾的变化及其与盐度、pH、叶绿素a、溶解有机碳、化学需氧量和碳水化合物的关系.结果表明,大沽河溶解有机物类腐殖质荧光强度较大,胶州湾溶解有机物类腐殖质荧光强度较小,大沽河是胶州湾类腐殖质荧光物质的重要来源.类腐殖质荧光强度与叶绿素a含量的相关性较差,说明浮游植物并不是大沽河类腐殖质荧光物质的主要来源.类腐殖质荧光强度与溶解有机碳、化学需氧量和碳水化合物的相关性较好,说明类腐殖质荧光物质是水体溶解有机物的重要组成部分,其分布情况一定程度地反映了水体中有机物的分布.

Change of Humic-Like Fluorescence Characteristics of Dissolved Organic Matter from Dagu River to Jiaozhou Bay

Fluorescence excitation-emission matrix spectroscopy was employed to characterize the change of humic-like fluorescence from Dagu River to Jiaozhou Bay.The relationships of humic-like fluorescence characteristics with salinity, pH,chlorophyll a,dissolved organic carbon,chemical oxygen demand and carbohydrate were discussed.The results show that humic-like fluorescence intensities are high in Dagu River but low in Jiaozhou Bay.The input of Dagu River is important origin of humic-like fluorescent dissolved organic matter of Jiaozhou Bay.High humic-like fluorescence intensity and high chlorophyll a are not coexist always,which suggests that humic-like fluorescent dissolved organic matter doesn't mainly come from phytoplankton.Good relationships of humic-like fluorescence intensity with dissolved organic carbon,chemical organic demand and carbohydrate suggest that humic-like fluorescent matter is the main component of dissolved organic matter.The distribution of humic-like fluorescence reflects the distribution of dissolved organic matter to some extents.