| Microbial production and photobleaching of CDOM in an estuarine brackish lake on Chongming Island, Shanghai |
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| 作者姓名： | Xiaomin ZHU Jianhua LI Qinghui HUANG Fan YANG |
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| 作者单位： | Key Laboratory of Yangtze Aquatic Environment of Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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| 摘 要： | Chromophoric dissolved organic matter （CDOM）, one of the important components in freshwater and seawater ecosystems, plays a role in underwater light absorption and primary productivity. The Lake Beihu was a part of the North Branch of the Yangtze （Changjiang） River estuary in the past, but now the Lake Beihu has become the biggest manmade brackish lake in East China. The lake is a unique brackish ecosystem, however, little study deals with the fate of CDOM in it and whether this type of lake ecosystem will face eutrophication problem. This paper focuses on the transformation of CDOM, and the impact of microbe and light in the Lake Beihu. Microbial production and natural photobleaching simulative experiment was done on water samples from the Lake Beihu, yielding the following results. Water samples were collected from the Lake Beihu in May 2006. The filtrates through Whatman GF/F filters and polycarbonate membranes （μm） were exposed to microbe and microbe plus light condition, respectively. Three-dimensional excitation emission matrix （3-DEEM） fluorescence spectra were analyzed. It was shown that the amount of CDOM increased with time in the microbe exposure experiment, which means that microbes may play an important role in the production of CDOM instead of degrading CDOM. The .productivity was enhanced with increasing temperature, e.g. the value of UV260 increased by 62.4% in 4.5 days at 30℃, 26.9% at 20℃, 5.0% at 10℃. In addition, photobleaching was observed in the study as other papers reported. With the impact of microbes, the fluorescence signal of fulvic acid became stronger as the time went by. At 30℃, the fulvic acid fluorescence, which was expressed by QSU, increased by 35%-39%.
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| 关 键 词： | 崇明岛 上海 溶解有机物 微生物 盐湖 荧光性 光漂白 富营养作用 废水处理 |
Microbial production and photobleaching of CDOM in an estuarine brackish lake on Chongming Island, Shanghai |
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| Xiaomin ZHU Jianhua LI Qinghui HUANG Fan YANG.Microbial production and photobleaching of CDOM in an estuarine brackish lake on Chongming Island, Shanghai[J].Chinese Journal of Geochemistry,2006,25(B08):265-265. |
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| Abstract: | |
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| Keywords: | CDOM photobleaching microbial productivity fluorescence brackish lake |
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