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The contribution of component variation and phytoplankton growth to the distribution variation of chromophoric dissolved organic matter content in a mid-latitude subtropical drinking water source reservoir for two different seasons

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Abstract

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.

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Acknowledgments

This work was supported financially by the National Natural Science Foundation of China (grant number 51509037), Natural Science Foundation of Fujian Province (grant number 2016J05115), Middle and Young Teachers’ Education and Scientific Research Projects of Fujian Province: Class A (grant number JA15111), and Science and Technology Major Special Projects of Fujian Province (grant number 2014YZ0002-1).

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Correspondence to Yuyi Zheng or Feifeng Wang.

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Responsible editor: Philippe Garrigues

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Sun, Q., Jiang, J., Zheng, Y. et al. The contribution of component variation and phytoplankton growth to the distribution variation of chromophoric dissolved organic matter content in a mid-latitude subtropical drinking water source reservoir for two different seasons. Environ Sci Pollut Res 24, 17805–17815 (2017). https://doi.org/10.1007/s11356-017-9448-9

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Keywords

  • CDOM
  • PARAFAC
  • Phytoplankton growth
  • Component variation
  • MDWSR