中文摘要：

利用紫外分光光度法和荧光法测定了2004年12月到2005年3月太湖不同湖区有色可溶性有机物（CDOM）的吸收和荧光，分析了CDOM荧光发光光谱、空间分布及其与吸收系数、溶解性有机碳（DOC）浓度之间的关系。结果表明，在355nm光激发下，CDOM在450nm处荧光峰值相当明显。CDOM荧光值存在明显空间差异，高值出现在竺山湾、梅梁湾、五里湖等湖区，低值出现在东太湖、贡湖湾等湖区，污染严重的北部湖区一般高于南部湖区。定标后的荧光值Fn（355）、CDOM吸收系数a（355）、DOC浓度4个月均值分别为（11．87±3．49）N．FL．U、（3．45±1．33）m^-1 、（9．50±2．79）mg·L^-1。Fn（355）与CDOM吸收系数、DOC浓度存在非常显著的线性关系，并且随波长降低相关性逐渐增加。4次观测到的a（355）与Fn（355）线性关系式的斜率值相差很小，相对比较稳定，a（355）与Fn（355）的比值在30％左右。

英文摘要：

Emission spectra, spatial distribution of fluorescence, relations between chromophoric dissolved organic matter （CDOM） fluorescence and absorption coefficient, dissolved organic carbon （DOC） concentration were studied based on the measurements from December 2004 to March 2005 in Lake Taihu. A significant fluorescence emission peak is found near 450 nm with an excitation wavelength of 355 nm. There are obvious differences for fluorescence peak in different lake regions. Higher peak values are found in Zhushanhu Lake, Meiliang Bay, Wulihu Lake due to pollution input from urban rivers and lower peak values are found in East Lake Taihu, Lake Gonghu. The peak values are generally higher in northern lake regions than those in southern lake regions. The average values of CDOM fluorescence normalized F,（355）, absorption coefficients a（355） and DOC concentrations are （11.87±3.49） N.FL.U, （3.45±1.33） m^-1, （9.50＋2.79） mg·L^-1, respectively. Significant linear relationships are observed between Fn（355） and absorption coefficients, DOC concentrations in Lake Taihu. The determination coefficients between Fn（355） and absorption coefficients increase with the decrease of wavelength in the range of 240 to 450 nm. The linear slope between a（355） and Fn（355） has a relatively steady value during four times of measurements. The ratios of a（355） to Fn（355） only vary approximately 30% from December 2004 to March 2005 in Lake Taihu.