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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (6): 2013-2023.doi: 10.13287/j.1001-9332.201706.022

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Seasonal changes of optical absorption properties of river and lake in East Liaohe River basin, Northeast China

SONG Yan-yan1,2, SU Dong-hui1,2, SHAO Tian-tian1*   

  1. 1Key Research Institute of Yellow River Civilization and Sustainable Development &Collaborative Innovation Center on Yellow River Cirilization of Henan Province, Henan University, Kaifeng 475001, Henan, China
    2College of Environment and Planning, Henan University, Kaifeng 475001, Henan, China
  • Received:2016-11-07 Published:2017-06-18
  • Contact: *E-mail:shaott2010@yeah.net.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41601377, 41601120)

Abstract: The absorption characteristics of optically active constituents (OACs) in water column are important optical properties and basic parameters of establishing the inverse analysis model. Comparative analyses about seasonal variability of the optical absorption characteristics (phytoplankton, non-algal particles and chromophoric dissolved organic matter absorption characteristics) and water quality status of East Liaohe River basin were conducted based on the water samples in Erlong-hu Reservoir collected in June, September and October of 2011 and samples in East Liaohe River in October of 2012. The results demonstrated that the eutrophication status of Erlonghu Reservoir was lower in June, eutrophic in September and moderately eutrophic in October. Some of the sampling points of the East Liaohe River belonged to the middle trophic level and the other part belonged to the eutrophic level. The absorption coefficient of each component of water increased with increasing nutrient level. Besides, the absorption spectra of total suspended particulate of Erlonghu Reservoir in June and October were similar to that of non-algal particles, and chromophoric dissolved organic matter (CDOM) contributed most to the total absorption of water. The absorption spectra of total suspended particulate matter in September were similar to that of phytoplankton and phytoplankton was the dominant contributor to the total absorption. For samples of Erlonghu Reservoir in June and September, aph(440) and total phosphorus (TP) were correlated closely with each other. Significant correlation between aph(440) and dissolved organic carbon (DOC) of Erlonghu Reservoir in June was observed, while ad(440) was only correlated with Chla. There were positive correlations between aph(675) and Chla, Carlson index (TLI) in Erlonghu Reservoir (September) and East Liaohe River. Obvious differences of water optical properties were found between river and lake located in the East Liaohe River basin as follows: There were two types of phytoplankton spectra curves of East Liaohe River and the contribution rates of different components varied greatly from sites to sites; Phytoplankton dominated spectral absorption in waters with high nutrition level (Erlonghu Reservoir in September and the East Liaohe River) while CDOM and the particles were both the main components for Erlonghu Reservoir in June and October; CDOM was composed of large-size molecules in waters of Erlonghu Reservoir in June and in the East Liaohe River in October and mainly of small-size molecules in Erlonghu Reservoir in September and October.