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Regional-scale mobile observations of atmospheric isoprene were conducted along a 2000km east-west transect in China's subtropical forest region using a mobile laboratory equipped with a high-resolution proton transfer reaction time-of-flight mass spectrometer (PTR-TOF-MS). The objective of this study was to elucidate the spatial distribution patterns of isoprene in this area. The results revealed significant spatial heterogeneity in isoprene concentrations, with an average value of (0.635 ± 0.204) μg/m3. The isoprene concentration in the Jiangnan forests, characterized by widespread bamboo and predominantly subtropical evergreen broadleaf species, was (0.629 ± 0.116) μg/m3, which was approximately 32.8% higher than the (0.474 ± 0.155) μg/m3observed in the Guizhou forests, primarily composed of conifers. These findings indicate that the spatial distribution and emission intensity of isoprene in forested areas are significantly influenced by vegetation composition. Moreover, in the industrially dense Zhejiang region, the isoprene concentration reached (0.881 ± 0.155) μg/m3, representing increases of 86.2% and 40.1% compared to the Guizhou and Jiangnan forests, respectively. These results suggest that in addition to the rich diversity of plant species, anthropogenic factors such as industrial and traffic activities also likely contribute to the elevated isoprene concentrations observed in this region.
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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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