Underwater spectra of Lake Taihu in summer and influences of chromatic light on Microcystis colonies
TAN Xiao1, LIU Qian-qian1, DUAN Zhi-peng1, LI Nie-gui2
1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;
2. Nanjing Automation Institute of Water Conservancy and Hydrology, Nanjing 210012, China
Indoor simulation experiments of different chromatic light (red light, blue light, and white light) were designed based on the underwater spectra of sampling sites at Meiliang Bay (M1, M2) and Gonghu Bay (G1, G2) during summer blooms, so as to investigate effects of chromatic light on the growth and colony maintenance of Microcystis. Results showed that the background turbidity at sampling sites was relatively high, and the underwater spectra shifted to the band of yellow and red light. Results of indoor simulation experiment showed that Microcystis colonies of red light group were larger than those of blue light group and white light control after 24days. Data showed that red light was favorable to increase the content of polysaccharides (total polysaccharides and binding extracellular polysaccharides). As for Microcystis aeruginosa unicells (FACHB-469), cell concentration of white light control kept the highest level, followed by the red light group, and then the blue light group. Based on the field observation and indoor simulation, the underwater spectra at sampling sites were favorable for maintaining of Microcystis colony size and growth rate, which may possibly result in the differences of habitat heterogeneity between outdoor colonial Microcystis and indoor unicellular Microcystis. Changes of underwater spectra can influence the formation and maintenance of Microcystis colonies.
谭啸, 刘倩倩, 段志鹏, 李聂贵. 太湖夏季水下光谱及色光对微囊藻群体的影响[J]. 中国环境科学, 2017, 37(11): 4277-4283.
TAN Xiao, LIU Qian-qian, DUAN Zhi-peng, LI Nie-gui. Underwater spectra of Lake Taihu in summer and influences of chromatic light on Microcystis colonies. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4277-4283.
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