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Based on the chemical components in PM2.5 and meteorological data from the online monitoring of Zibo Super Station, relevant analyses were conducted for the PM2.5 pollution period from December 25th, 2023 to January 6th, 2024. The results showed that during the observation period, the average concentration of PM2.5 was (133±67) μg/m3, and the average proportion of secondary inorganic ions (NO3-,SO42- and NH4+) was 58.3%. Among them, the concentration of NO3- was the highest, accounting for 26.9%. The average values of the sulfur oxidation ratio and nitrogen oxidation ratio were 0.46 and 0.29, respectively, both greater than 0.1, indicating that there was an obvious secondary formation process of SO42- and NO3- during this pollution process. The formation of NO3- was mainly limited by HNO3, and the heterogeneous reaction under high-humidity conditions was the main pathway for its formation. The Positive Matrix Factorization (PMF) model identified six main sources of PM2.5, namely secondary nitrates (30.2%), secondary sulfates (26.8%), coal burning sources (18.4%), motor vehicle sources (15.3%), industrial sources (5.3%), and dust sources (4.0%). Concentration Weighted Trajectory (CWT) analysis further revealed the main contribution path areas of sources with a relatively large contribution to PM2.5, such as secondary nitrates, which were mainly from the local area and surrounding cities.
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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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