东平湖DOM荧光特征及与氢氧同位素指标的相关性

本研究在运用三维荧光光谱示踪平水期东平湖DOM荧光特征的基础上，进一步分析其与氢氧同位素指标的相关性，并在此基础上尝试对大气降水的DOC贡献进行估算，以期为东平湖的污染控制及治理提供依据.结果表明，东平湖平水期DOM主要由类蛋白组分（C1和C4）和类腐殖质组分（C2和C3）构成，以类酪氨酸组分C1为主，C1所占比重将近50%.平水期东平湖DOM同时受陆源、内源及大气降水的影响，但以内源输入为主；外源输入中大气降水补给与大汶河输入所占比例相当；大气降水中的溶解性有机碳输入可能会对东平湖DOM产生不可忽视的影响，需进一步系统研究.氢氧稳定同位素与溶解态有机碳以及类腐殖质荧光之间呈显著相关关系，可以在一定程度上指示DOM的变化趋势.

Fluorescence characteristics of DOM in Dongping Lake and its correlation with hydrogen and oxygen stable isotopes

The combined EEMs-PARAFAC model and hydrogen and oxygen stable isotopes were applied to characterize the fluorescence characteristics and sources of DOM, the distribution of hydrogen and oxygen stable isotopes, and deuterium surplus. Four fluorescence components were identified in DOM, and the tyrosine-like component 1 dominated the DOM pool. The DOM was affected by autochthonous, exogenous and atmospheric precipitation at the same time, but mainly by autochthonous input. The proportion of atmospheric precipitation recharge was larger than that of Dawen River. The dissolved organic carbon input in atmospheric precipitation might have an important effect on the DOM in Dongping Lake, which need further systematic study. Hydrogen and oxygen stable isotopes were found to be significant correlated to dissolved organic carbon and humic-like fluorescence, which could indicate the changing trend of DOM to a certain extent.