1. Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, Guiyang 550001, China; 2. International Joint Research Centre for Aquatic Ecology, Guiyang 550001, China; 3. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract：In order to understand the metal accumulation characteristics in phytoplankton in Hongfeng Reservoir, the phytoplankton and its metal content in Hongfeng Reservoir were monitored and analyzed in winter (January), spring (April), summer (July), and autumn (October) in 2018. The results indicated that the metal concentration in phytoplankton in Hongfeng Reservoir of Guizhou Plateau was in the order of Ca > Fe > Mg > Mn, and Ca accounted for 73.9% of the total metal content. In addition, there was a significant seasonal difference in metal content. The total metal accumulation in phytoplankton in winter was highest at 273.13mg/g, followed by autumn and summer, the accumulation in spring was lowest at 183.82mg/g. The spatial order of metal enrichment of phytoplankton at the sampling site was: Sancha > Houhu > Daba > Jiangjun > Houwu > Huayudong. The metal content from sample sites in Sancha and Houhu was high, while that in Huayudong was low. The correlation between Fe and Mn was significant. Ca and Mg might have common sources. The RDA analysis showed that there was a strong relativity between the metal content in phytoplankton in four seasons and both of cyanobacteria and chlorophyta. These results showed that the metal content of phytoplankton in Hongfeng Reservoir had a significant spatial-temporal variation, and a significant correlation with the dominant algae species in autumn and winter.
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