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The decomposing process of Ulva prolifera green tide was simulated in the outdoor pond to study laws of the nutrient release. Simultaneously, we carried out field investigation in the coast of Qingdao in June 2018, such as the Aoshan Bay, the outside of Aoshan Bay and the Shilaoren Beach, to monitor regularly the seawater quality. Simulation experiment results showed that the concentrations of nitrogen and phosphorus nutrients were increasing significantly during the decomposition of Ulva proliferas and dissolved organic and particulate states are the main forms of nitrogen and phosphorus nutrients. The concentrations of dissolved organic nitrogen (DON), particulate nitrogen (PN), dissolved organic phosphorus (DOP) and particulate phosphorus (PP) nutrients in the water of 5 g/L biomass experiment were much higher than original water. Field investigation results showed that the nitrogen and phosphorus nutrients contents in the seawater reduced to the minimum gradually due to the absorption of the green tide. And then, as the decomposing of the Ulva prolifera green tide, the contents of nitrogen and phosphorus nutrients in the sea water were gradually increasing. Aoshan Bay was most affected by the Ulva prolifera green tide, it was even inferior to the second-class water quality standard. PN and PP were the main forms of nutrients in the investigation area, this situation was most obvious in the Aoshan Bay (PP, 2.02 μmol/L). Compared with Aoshan Bay, the seawater exchange capacity of the Shilaoren Beach was strong, and it was intercepted and salvaged in time after that the Ulva prolifera green tide was docked, which was less affected by the decomposing of Ulva prolifera green tide. With the accumulation and decay of the Ulva prolifera, the nutrients content and structure of the sea area changed significantly, which had severe impact on the stability of the phytoplankton community, which may cause secondary disasters of red tide. Therefore, we must promptly clean up the Ulva prolifera gathered near the coast of Qingdao to reduce the impact on nearshore seawaters in the southern Yellow Sea.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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