天然溶解有机质（dissolved organic matter, DOM）研究在水体生态环境系统的修复研究中扮演着重要的角色，是近年来水环境研究领域的一个热点和难点。目前，紫外―可见光谱和分子荧光光谱在天然溶解有机质是表征天然溶解有机质的重要有效的手段，也是研究天然溶解有机质的主要手段。红枫湖为贵阳市5 个主要饮用水源地之一，对贵阳市社会发展具有重要作用。采用紫外―可见光谱和分子荧光光谱相结合的研究方法，对采自红枫湖中10个点的水样中天然溶解有机质的光谱特性研究。研究结果表明，红枫湖水体光谱特征主要表现为紫外―可见吸光值参数 E3/E4的变化范围是1.70~8.77。除后五火电厂外，水下10 m比水下5 m的 E3/E4 值要高。此外，荧光指数 f 450/500 的变化范围是1.38~1.52。初步认为红枫湖目前的主要有机物污染是陆源性的。后五火电厂，北湖湖心和张官三点水样的光谱特征与其他地方不同。同时还表明溶解有机质的腐殖化程度与水深具有一定的相关性。

Dissolved organic matter (DOM) is a focus and challenge in the field of water environmental research since it plays an important role in the restoration research of aquatic system. Ultraviolet-visible (UVVIS) spectroscopy and fluorescence spectrophotometer are often used as an effective way for extracting DOM characteristics. In the present research, spectral characteristics of DOM were studied in water samples from different locations of the Hongfeng Lake, a man-made deep karstic lake and a key drinking-water source for Guiyang City, Guizhou Province, and various components of organic matter distributed at different samples were identified. The UV-VIS absorption ratio values (E3/E4) for the water samples collected from the Hongfeng Lake ranged from 1.70 to 8.77,and in general these values at 10 m depth were higher than those at 5 m depth except site HWHDC, while the fluorescence ratio values (f450/f500) ranged from 1.38 to 1.52. It could thus be inferred that the main organic pollution was from terrestrial origin at present. It is found, however, that spectral characteristics of the water samples from sites HWHDC, BHHX and ZG are different from those from the other sites. In addition, the results indicated that the depth of water had correlation with the humification degree of organic matter.