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From August 28 to September 3, 2024, the concentrations of atmospheric pollutants and chemical compositions of PM2.5 along the Hubei stretch of the Yangtze River were obtained using on aboard instruments. During the mobile survey, the average concentrations of CO, NO2, O3, and SO2 were (0.75 ± 0.22) mg/m3, (19.87 ± 12.77) μg/m3, (74.23 ± 39.22) μg/m3, and (21.98 ± 8.81)μg/m3 respectively, all below China's Grade I Ambient Air Quality Standards. The mean PM2.5 mass concentration was (35.84 ±12.08) μg/m3, with organic matters being the dominant component ((21.94 ± 7.36)%), followed by SO42-((20.53 ± 10.31)%), NO3- ((19.88 ± 12.29)%), and ((12.80 ± 4.70)%). Using the receptor model, four PM2.5 sources including secondary inorganic aerosols, ship emissions, biomass burning, and industrial emissions were apportioned with contributions of (47.86 ± 6.17)%, (26.61 ± 3.32)%, (18.29 ± 6.57)%, and (8.38 ± 4.68)%, respectively. Comparison between mobile ship-based observations and land-based stationary supersite observations revealed stronger secondary formation over the river surface. By coupling the FLEXPART backward simulation with the PM2.5 emission inventory, the relative contribution of each grid point in the study area to the PM2.5 concentration along the mobile monitoring route was calculated and the contribution rate along the Yangtze River was 76.90%, while other regions accounted for 23.10%. FLEXPART forward simulation indicated that the ship emissions exerting greater impacts on the riverine regions than other areas.
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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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