利用平行因子分析法(PARAFAC)解析了滇池水样的三维荧光光谱, 揭示了其有色溶解性有机质(CDOM)组分的分布特征, 并利用主成分分析法对影响滇池水体的CDOM的主控因素以及其相对贡献进行了研究。 结果表明, 滇池水体CDOM可分为四个组分, 分别为类腐殖质荧光组分C1(240, 415), C3(265, 525), C4(255, 505)和类蛋白荧光组分C2(230/280, 330); 空间分布呈现北部和入湖河口处等污染较重的区域CDOM组分荧光强度最高, 而其区域较低的趋势, 且四个组分呈现正相关(p<001), 说明其来源相同。 主成分分析表明, 滇池水体CDOM四个组分均来源于陆源有机质(贡献率7418 %); 同时, DTN, DTP, DON受四DOM组分的控制比较明显, 显示出强烈的陆源性质。 滇池水体CDOM组分可以与溶解性营养盐较好的多元非线性拟合, 进而通过CDOM的三维荧光光谱研究, 可以在一定程度上指示滇池水体富营养化水平。

The water samples of the Tien Lake were collected for the three-dimensional fluorescence spectrum detected. And parallel factor analysis (PARAFAC) and principal component analysis (PCA) were used for the spectra analyzing to know the main factor and relative contribution of the chromophoric dissolved organic matter (CDOM). PARAFAC decomposed CDOM into four components, the humic-like: C1(240, 415), C3(265, 525), C4(255, 505) and the protein-like: C2(230/280, 330). The fluorescence intensity of CDOM components was high in north and estuary of the lake, but low in the other region. All the four components show significant positive correlations (p＜001), this result means they may have the same sources. Principal component analysis shows that these four components of the Tien Lake are all from terrestrial organic matter, meanwhile its DTN, DTP, DON may also come with the terrestrial substance. These components of Tien Lake can well be connected with dissolved nutrient salts by nonlinear multiple regression, which means we can use the three-dimensional fluorescence spectrum results of CDOM to indicate the eutrophication degree of Tien Lake.