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中文摘要：
应用吸收和三维荧光光谱对2007年夏季太湖入湖河口和大太湖开敞区有色可溶性有机物（CDOM）浓度及来源进行研究．结果表明，河口区和开敞区CDOM吸收系数a（355）存在显著空间差异，河口区明显大于开敞区（ANOVA，P〈0．001），a（355）最大值出现在大浦河口和竺山湾漕桥河口附近，最小值出现在东太湖和胥口湾．a（355）与溶解性有机碳、化学耗氧量浓度存在显著正相关．所有样品一般都含有4个明显的荧光峰，包括1个可见光区的类腐殖质荧光C峰，1个紫外光区的类腐殖酸荧光A峰，2个类蛋白荧光B峰和D峰．河口区外源输入的类腐殖质荧光非常强，显著大于开敞区（ANOVA，P〈0．05），而河口区和开敞区类蛋白荧光没有显著性差异，反映开敞区除外源河流输入外，内源生物降解等对类蛋白荧光贡献增加．在河口区B、C峰的比值r（B／C）1b于1，均值为0．62±0．14、在开敞区r（B，C）除12^#是0．92，其他值均大于1，均值为1．12±0．13，初步判断r（B，C）可以作为区分CDOM来源的重要参数．CDOM吸收a（355）与类腐殖质荧光C峰、A峰均存在极显著的正相关，而与类蛋白荧光相关性则明显下降，与D峰存在显著正相关，与B峰没有显著相关．
英文摘要：
Using absorption and three-dimensional excitation-emission matrix spectra （3DEEMs）, concentration and source of chromophoric dissolved organic matter （CDOM） were studied at the river inlet and open water area of the Lake Taihu in summer of 2007. Significantly spatial difference was recorded for CDOM absorption coefficient at the areas （ANOVA, P〈0.001）, with the highest value in the river inflows of Dapu and Caoqiao and with the lowest value in East Lake Taihu and Xukou Bay. CDOM absorption coefficients are significantly correlated with dissolved organic carbon （DOC） and with chemical oxygen demand （COD） concentrations. Four EEMs peaks were identified in every samples, including a humic acid fluorescence peak （C） in visible range, a humic acid fluorescence peak in UV range （A） and two protein-like fluorescence peaks （B and D）. Strong humic acid fluorescence was identified in the samples from the river inflows, with a significant spatial difference from humic acid fluorescence （Peaks A and C） at the river inlet and the open lake area （ANOVA, P〈0.05）. However, there was no significant decrease for protein-like fluorescence （Peaks B and D） from the river inlet to the open area due to the dilution of lake water, showing that the dilution effect is increasing from internal source ofphytoplankton degradation to protein-like fluorescence. The ratio of peak B over peak C （r（B/C）） was lower than 1 with the average value of 0.62±0.14, but was larger than 1 at sample 12 with the average value of 1.12±0.13. The r（B/C） can be preliminary used to distinguish the composition and source of CDOM. Significantly positive correlations were found between CDOM absorption coefficient and the fluorescence intensities of peaks A, C, D, but no significant correlation found with peak B.
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