Journal of Ecology and Rural Environment ›› 2014, Vol. 30 ›› Issue (4): 488-494.doi:

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Spectral Absorption Characteristics and Potential Sources of CDOM in Rivers in Shanghai Region

LI  Dian-Bao, ZHANG  Wei, WANG  Li-Qing, SHAN  Ying, HAN  Liang   

  1. College of Fisheries and Life Science,Shanghai Ocean University
  • Received:2014-02-21 Revised:2014-06-18 Online:2014-07-25 Published:2014-10-11
  • Contact: WANG Li-Qing College of Fisheries and Life Science,Shanghai Ocean University E-mail:lqwang@shou.edu.cn

Abstract: Spectral absorption characteristics, distribution and potential sources of CDOM (chromophoric dissolved organic matter) in 14 rivers running in 6 districts of Shanghai were investigated in August 2013. Results show that spectral absorption coefficients of CDOM in the rivers, regardless of districts, all displayed an exponentially decreasing trend in all bands from ultraviolet to visible light with CDOM spectral absorption coefficient a(355) varying in the range of 2.34 -4.33m-1. Spectral absorption coefficient of CDOM in rivers varied sharply from district to district. On the whole, CDOM spectral absorption coefficient was higher in rivers running in the urban area than in rivers in the suburban area. Correlation analysis reveals that, CDOM spectral absorption coefficient a(355) was closely related to permanganate index and turbidity, separately, but not so much to concentration of chlorophyll a (average 30.59μg•L-1), which suggests that the CDOM in the rivers may mainly come from the terrestrial sources, such as urban domestic sewages, industrial wastewater, agricultural non-point source pollution, etc.. Analysis of M, ratio of a(250)/a(365), and S, spectral absorption slope, brought about the same conclusion. The study of CDOM optical properties in the river water of Shanghai would help understand distribution of underwater light field in the rivers of Shanghai, and lay down some theoretical basis for restoration of aquatic vegetations in the rivers.

Key words: ecological river, chromophoric dissolved organic matter (CDOM), spectral absorption coefficient, Shanghai City

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