同温混合初期主库区沉积物间隙水DOM的光谱特征——以周村水库为例

运用紫外-可见光谱技术以及结合平行因子分析法的三维荧光光谱（EEM-PARAFAC）技术，对周村水库秋末同温混合初期的沉积物间隙水中溶解性有机物（DOM）的光谱特征进行分析.结果表明：周村水库沉积物间隙水DOM的紫外-可见吸收光谱并无明显特征峰，吸收系数的变异系数在50%~330%之间，表明其性质在不同深度上存在差异；E2/E3、E3/E4随深度增加，说明富里酸所占DOM的比例随沉积物深度增加而升高；三维荧光光谱中分离了4个组分，分别为类富里酸（C1、C2）、类蛋白（C3）和类腐殖酸（C4）；类蛋白（C3）与类腐殖酸（C4）具有显著的相关性（P<0.01，R=0.905）；DOM总荧光强度以及各组分荧光强度随着沉积物深度的增加均呈下降趋势，但DOM中腐殖质所占比例随深度逐渐增加，各样点间各荧光组分的荧光强度与组分比例差异显著；水库沉积物间隙水的高FI（1.8~2.0）和BIX（>1.0），以及低HIX（<4.0）的荧光特征指数，说明不同深度DOM的腐殖化程度低，均来源于微生物作用.

Spectral characteristics of DOM in sediment interstitial water of the main reservoir area during the initial stage of isothermal mixing:A case study of Zhoucun Reservoir

Spectral characteristics of DOM in sediment interstitial water during the initial stage of isothermal mixing in Zhoucun reservoir was explored based on Uv-Vis spectra and EEM-PARAFAC technology. Results showed that there was no obvious Uv-Vis of the DOM in sediment interstitial water, and the variation coefficient of absorption was between 50% and 330%, indicating that the DOM at different sediment depths was different. The E2/E3 and E3/E4 value increased with sediment depths, indicating that the proportion of fulvic acid in DOM increased with sediment depths. Two kinds of fulvic-like acid (C1 and C2), one kind of protein-like (C3) and one kind of humic-like (C4) were identified by PARAFAC technology, and C3 showed a significant correlation with C4(P<0.01, R=0.905). The fluorescence intensity of total, C1, C2, C3 and C4 decreased with the increase of sedment depths, while the proportion of humic acid in DOM increased gradually, and the fluorescence intensity and fluorescence abundance were different at different sampling points; The high FI(1.8~2.0) and BIX(> 1.0), and low HIX(<4.0) of sediment interstitial water indicated that the DOM exhibited lower aromaticity and are mainly derived from aquatic bacterial input.