[Distribution Characteristics and Influencing Factors of Chromophoric Dissolved Organic Matter in a Northern-Side River of the Qinling Mountains in Summer]

Zi-Shen Lin; Ting-Lin Huang; Shang-Ye Yang; Cheng-Cheng Wen; Yan-Qing Li; Shi-Lei Zhou; Xuan-She Song

doi:10.13227/j.hjkx.201909113

[Distribution Characteristics and Influencing Factors of Chromophoric Dissolved Organic Matter in a Northern-Side River of the Qinling Mountains in Summer]

Huan Jing Ke Xue. 2020 May 8;41(5):2210-2220. doi: 10.13227/j.hjkx.201909113.

[Article in Chinese]

Authors

Zi-Shen Lin^{1

2}, Ting-Lin Huang^{1

2}, Shang-Ye Yang^{1

2}, Cheng-Cheng Wen^{1

2}, Yan-Qing Li^{1

2}, Shi-Lei Zhou³, Xuan-She Song⁴

Affiliations

¹ Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
² Shaanxi Key Laboratory of Environmental Engineering, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
³ Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
⁴ Lijiahe Reservoir Management Co., Ltd., Xi'an 710016, China.

PMID: 32608838
DOI: 10.13227/j.hjkx.201909113

Abstract

UV-visible absorption spectroscopy, fluorescence spectroscopy, and parallel factor analysis were used to analyze the composition of chromophoric dissolved organic matter (CDOM) in the waters of the Wangchuan River in summer, and the source of this CDOM was explored. The redundant analysis method and Pearson correlation were used to analyze the correlation between optical parameters and water quality parameters. The results showed that the CDOM of the Wangchuan River is composed of the tryptophan-like component C1 (245, 300/335 nm), the short-wave humus component C2 (240, 320-340/405 nm), and the long-wave humus component C3 (270, 350-370/470 nm), in which components C1 and C2 have some homology (r=0.859, P<0.001). CDOM absorption coefficient α(355) indicates that the CDOM concentration in the water body of the Wangchuan River is at a low level, and the correlation between α(355) and DOC concentration is significant (r=0.850, P<0.001), which is conducive to the establishment of a DOC inversion model. Water fluorescence index FI (2.36±0.20), HIX (3.66±2.47), BIX (1.56±0.82), and freshness index (β:α) (1.33±0.62), and the spectral slope ratio S_R (0.76±0.25) indicate that the CDOM of the Wangchuan River has strong self-generated characteristics, weak humification characteristics, and more new CDOM. Redundancy analysis showed that the humic components (C2, C3) are affected by algae metabolism and microbial action, while tryptophan-like components (C1) are related to land-based input, and negatively correlated with dissolved total nitrogen. The humic components C2 and C3 are positively correlated with total phosphorus, dissolved total phosphorus, and dissolved organic carbon. This paper clarifies the characteristics and influencing factors of CDOM in the Qinling valley, and provides a theoretical basis for water body management in the Qinling valley.

Keywords: Qinling valley; UV-visible spectroscopy; chromophoric dissolved organic matter (CDOM); redundancy analysis (RDA); three-dimensional excitation-emission matrix spectroscopy.

Publication types

English Abstract