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Dominated crops Triticum aestivum, Zea mays, Glycine max, and Arachis hypogaea were selected to study the Volatile Organic Compounds (VOCs) emission characteristics and their atmospheric reactivity of crop. The dynamic enclosure system and the thermal desorption and gas chromatography-mass spectrometry (TD-GC-MS) technique were used for the quantitative analysis of VOCs emission. The VOCs emission rate and chemical composition characteristics of four crops were studied, and their hydroxyl radical consumption rate (LOH) and O3 formation potential (OFP) were calculated. The results showed that the total VOCs emission rates of four crops were ranked as Arachis hypogaea ((43.27 ± 18.8) μg/(g·h)) > Triticum aestivum ((21.63 ± 8.24) μg/(g·h)) >Glycine max ((2.97 ± 0.67) μg/(g·h)) > Zea mays ((0.36 ± 0.15) μg/(g·h)). The major emission contributing components of each crop included isoprene, n-heptane, cyclopentane, p-xylene, and m-xylene. The composition of VOCs emitted by the four crops were different. Triticum aestivum mainly emitted alkanes and aromatics, Zea mays mainly emitted monoterpenes, Glycine max mainly emitted alkanes, and Arachis hypogaea mainly emitted isoprene. Alkenes were detected only in VOCs emitted from Glycine max. The LOH and OFP of VOCs emitted by different crops also followed the same ranking: Arachis hypogaea > Triticum aestivum >Glycine max > Zea mays. Isoprene, limonene, trans-β-ocimene, β-caryophyllene, and cyclopentane were the key active components of VOCs emitted by the four crops.
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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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