中文摘要：

通过现场采样及室内理化性质分析,研究了我国不同区域6个不同特征湖泊表层沉积物营养盐和粒度的分布及其相互关系。结果发现,浅水富营养化湖泊杞麓湖、巢湖的沉积物营养盐含量和水体富营养化程度一致,而深水湖泊泸沽湖、程海和青海湖的沉积物营养盐含量和水体的营养状态没有关系,尤其是贫营养湖泊泸沽湖,沉积物中TN、TP含量远远高于东部富营养化严重的浅水湖泊。研究湖泊的表层沉积物中TOC与TN和Po表现出显著相关关系,表明沉积物中氮主要以有机氮的形式存在,有机质是有机磷的重要载体。表层沉积物粒径主要集中在64μm以下,不同的湖泊表层沉积物表现不同的粒度分布特征,沉积物营养盐含量较高的杞麓湖、程海、泸沽湖和巢湖的沉积物粒径更细,细颗粒所占比例高低与其污染程度相一致。沉积物中TOC、TN、TP、Pi、Po与小于4μm的细颗粒都呈现显著的正相关关系,而与16～64μm的粒径范围呈现负相关关系。

英文摘要：

In this study,the characteristics of nutrients and particle size in surface sediments of six lakes with different feature from different region were investigated,and the relationships between nutrients and particle size were also discussed. The results indicated that the nutrient content was consistent with lake trophic in shallow eutrophic lake,Lake Qilu and Lake Chaohu; However,there were no relationships in the deep lakes,Lake Luguhu,Lake Chenhai and Lake Qinhaihu. The concentrations of total nitrogen（TN） and total phosphorus（TP） were far higher in surface sediments of Lake Luguhu than those in shallow eutrophic lake of the middle and lower reaches of Yangtze River region. Total organic matter（TOC） was significantly correlated with TN,organic phosphorus（Po）,which suggested that organic nitrogen was the main fraction of TN and organic matter was important carrier of Po in studied surface sediments. The particle size of surface sediments were below 64 μm and have different distribution characteristics in different lake. The grain size was smaller in higher nutrient content of sediments. The percent content of small particle was consistent with pollution level of surface sediments. The particle of below 4 μm was significantly positive correlated with TOC,TN,TP,Pi and Po however,the particle in range of 16~64 μm was negative correlated with TOC,TN,TP,Pi and Po.