Sun Qiyuan, Jiang Juan, Zheng Yuyi, Wang Feifeng, Wu Chunshan, Xie Rong-Rong
College of Environmental Science and Engineering, Fujian Normal University, Shangsan Road No. 8, Fuzhou, Fujian, 350007, China.
Institute of Environmental Science, Fujian Normal University, Fuzhou, 350007, China.
Environ Sci Pollut Res Int. 2017 Jul;24(21):17805-17815. doi: 10.1007/s11356-017-9448-9. Epub 2017 Jun 11.
The distribution variation in chromophoric dissolved organic matter (CDOM) content in mid-latitude subtropical drinking water source reservoirs (MDWSRs) has great significance in the security of aquatic environments and human health. CDOM distribution is heavily influenced by biogeochemical processes and anthropogenic activity. However, little is known regarding the impact of component variation and phytoplankton growth on CDOM distribution variation in MDWSR. Therefore, samples were collected from a representative MDWSR (the Shanzai Reservoir) for analysis. CDOM absorption and fluorescence coupling with parallel factor analysis were measured and calculated. The results indicated that only two CDOM components were found in the surface water of Shanzai Reservoir, fulvic acid, and high-excitation tryptophan, originating from terrestrial and autochthonous sources, respectively. The types of components did not change with the season. The average molecular weight of CDOM increased in proportion to its fulvic acid content. The distribution variation in CDOM content mainly resulted from the variation in two CDOM components in summer and from high-excitation tryptophan in winter. Phytoplankton growth strongly influenced the distribution variation of CDOM content in summer; the metabolic processes of Cyanobacteria and Bacillariophyta consumed fulvic acid, while that of Cryptophyta produced high-excitation tryptophan.
中纬度亚热带饮用水源水库（MDWSRs）中发色溶解性有机物（CDOM）含量的分布变化对水生环境安全和人类健康具有重要意义。CDOM分布受生物地球化学过程和人为活动的严重影响。然而，关于MDWSR中成分变化和浮游植物生长对CDOM分布变化的影响知之甚少。因此，从一个具有代表性的MDWSR（山仔水库）采集样本进行分析。测量并计算了CDOM吸收和荧光耦合以及平行因子分析。结果表明，山仔水库表层水中仅发现两种CDOM成分，即富里酸和高激发态色氨酸，分别源自陆源和自生源。成分类型不随季节变化。CDOM的平均分子量与其富里酸含量成正比。CDOM含量的分布变化主要源于夏季两种CDOM成分的变化以及冬季高激发态色氨酸的变化。浮游植物生长在夏季强烈影响CDOM含量的分布变化；蓝藻和硅藻的代谢过程消耗富里酸，而隐藻的代谢过程产生高激发态色氨酸。
