Dissolved organic matter components and sources in upstream of Lijiahe Reservoir
LIN Zi-shen1, HUANG Ting-lin1, LI Kai1, WEN Cheng-cheng1, YANG Shang-ye1, LI Yan-qing1, WANG Zhi2
1. Key Laboratory of Environmental Engineering, Shaanxi Province, Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China;
2. Lijiahe Reservoir Management Company, Xi'an 710016, China
The source and characteristics of dissolved organic matter (DOM) in upstream waters of Lijiahe Reservoir were analyzed by three-dimensional fluorescence spectrometry, and the seasonal variation characteristics and influencing factors of DOM components were discussed. The results showed that the DOM of the upper reaches of the Lijiahe Reservoir consists of three fluorescent components, namely tyrosine (220nm, 270nm/300nm), UVA humus (250nm/430nm) and tryptophan (225nm, 280nm/335nm). Among them, tyrosine is the main component, but its content does not change much in the dry and wet seasons, while the UVA humus and tryptophan content showed significant seasonal differences. The fluorescence characteristic index indicated that the source of DOM in the upstream water of Lijiahe Reservoir has significant terrestrial characteristics, and its characteristics are more significant in the wet season. The fluorescent components of DOM in water body were positively correlated with total phosphorus in dry and wet seasons. In the wet season, the tyrosine-like component is positively correlated with Chl-a, turbidity and CODMn, but not in the dry season. A positive correlation between UVA humus and DOC in dry and wet seasons existed, and the correlation in wet season (P<0.01) was more significant than that in dry season (P<0.05). The correlation between tryptophan and CODMn also showed that the wet season (P<0.01) was stronger than the dry season (P<0.05).
林子深, 黄廷林, 李凯, 温成成, 杨尚业, 李衍庆, 王智. 李家河水库上游水体溶解性有机物组分与来源[J]. 中国环境科学, 2020, 40(3): 1275-1283.
LIN Zi-shen, HUANG Ting-lin, LI Kai, WEN Cheng-cheng, YANG Shang-ye, LI Yan-qing, WANG Zhi. Dissolved organic matter components and sources in upstream of Lijiahe Reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1275-1283.
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