Abstract： The absorption characteristics, compositions, spatial variability and the relative contribution of optically active constituents over the range of photosynthetically active radiation (PAR, 400-700 nm) were analyzed from samples collected in the Yiluo River and the Huntai River in May 2017 and 2013, respectively. The results demonstrated that the absorption curves of the total suspended particulates [ap(λ)] were similar to non-algae particles [ad(λ)]. Significant correlations were obtained between ap(λ) and ad(λ), especially at 440nm with r=0.968 in the Yiluo River and r=0.899in the Huntai River. Meanwhile, positive correlations between ap(λ) and the absorption of phytoplankton [aph(λ)] were observed at 675 nm. ap(λ) in the two basins was dominated by ad(λ). Moreover, the composition of auxiliary pigments and chloropyhll a concentration [Chla] showed significant spatial variations based on aph(440)/aph(675) in the Yiluo River than Huntai River. In addition, CDOM absorption slopes (SCDOM) indicated that the composition of CDOM in the Yiluo River was dominated by exogenous substances compared to the Huntai River with more endogenous substances. SCDOM in Yiluo River showed lower values than that in the Huntai River, demonstrating the CDOM composition of the Yiluo River was inclined to have high molecular weight. Furthermore, Mr[aCDOM(250)/aCDOM(365)] in Yiluo River showed greater ranges and lower mean value than in Huntai River, confirming that molecular weight of CDOM exhibited great variation in YiluoRiver and the CDOM molecular weight in the Huntai River was lower than Yiluo River, which was in accordance with the results based on SCDOM.
Key words： Yiluo River; Huntai River; optical absorption characteristics; particulate matter; CDOM; spatialdifference
【source】Environmental Science 2018Vol.39
