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Combined with hydrometeorological data, a six-day tracking survey was carried out in the coastal waters of Changhua Town, Changjiang County, western Hainan Island on March 10 to 15, 2022. And this study analyzed the variation characteristics of environmental factors and influencing factors in the process of Phaeocystis globose bloom. During the peak of the bloom, the abundance of Phaeocystis globosa and CODMn were as high as 3.10×108 cells/L and 35 mg/L, which were much higher than those reported in other areas. The rainfall and wind wave disturbance before the bloom promoted the terrestrial runoff and the release of sedimentary nutrients, which provided material conditions for the bloom. The sudden rise of temperature induces the bloom, and the larger tidal range and lower wind speed create favorable external conditions for the accumulation along the colony. During the elimination of the bloom, the concentrations of DIN, PO4-P, DO, CODMn and Mn decreased significantly, in which DIN and PO4-P were the limiting factors, and DO, CODMn and Mn were important characteristic factors. After the yellow colony broken, the concentrations of Chl a and SiO3-Si also decreased rapidly, and then slowly increased or even higher than the peak concentration level, when the diatom abundance represented by Chaetoceros curvisetus gradually increased. The study also preliminarily explores the basic generation and elimination process of the bloom, which provides an important reference for the further study of the bloom mechanism of P. globosa in this area.
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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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