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With the rapid development of China’s nuclear power industry，the impact of thermal discharge on the surrounding marine environment is increasingly attracting attention. Objective and accurate background temperatures are crucial for accurately assessing the thermal effects of warm water discharge. In this article, the sea area near a nuclear power plant in Fujian was studied. Based on long-term thermal infrared satellite data before the operation of the first unit，the distribution of sea surface temperature field under different seasons and tidal conditions was obtained through temperature inversion. By using grid method and correlation analysis method，the sub zones with the highest temperature correlation inside and outside the submersible discharge area were determined，and a continuous background temperature field with multi-point temperature coupling was constructed. The temperature rise field was extracted using recent thermal infrared satellite data，and the impact of the operation of four units on the temperature rise in the nearby sea area was evaluated. The results shows that using the multi-point temperature substitution method to extract the reference temperature is effective and reliable. Before the operation of nuclear power，the temperature field in the study area showed significant temperature differences and band like distribution characteristics：in winter，the temperature gradually decreased from offshore to nearshore，while in summer and other months with higher temperatures，the opposite trend was observed. After the operation of the nuclear power plant，there was a significant temperature rise area in the sea area near the discharge outlet. During the ebb tide period，the temperature discharge mainly affected Qingchuan Bay，while during the flood tide period，both Qingchuan Bay and Wendu Bay were affected. The area of temperature rise exceeding 2.0 ℃ is larger in winter than in summer under the same tidal state，and the area during high tide is larger than that during low tide in the same season.
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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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