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采用热解析与气相色谱联用技术对沈阳市4种主要乔木树种——银中杨、垂柳、榆树和皂角的BVOCs排放特征进行了观测。实验发现,不同树种排放BVOCs的组成情况明显不同,银中杨和垂柳以释放异戊二烯为主,且二者的BVOCs排放速率明显高于其他树种;榆树和皂角以释放柠檬烯为主。4种乔木树种BVOCs的释放具有显著的日变化和季节变化规律,各树种的BVOCs排放速率日变化曲线多表现为单峰型,排放高峰一般出现在中午或下午,且夜间几乎均不排放异戊二烯。季节变化趋势主要表现为夏季最高,春、秋季较低。
The characteristics of BVOCs emission of four main arbor species, Populus przewalskii, Weeping weeping willows, elm and saponins, were observed by means of thermal analysis and gas chromatography-mass spectrometry. The results showed that the composition of BVOCs released by different tree species was obviously different. The main isoprenoids were released from Populus przewalskii and Betula platyphylla, and the BVOCs emission rates of the two species were significantly higher than those of other species. The BVOCs of four arbor species had significant diurnal and seasonal variations. The diurnal variation curve of BVOCs emission rate of all tree species showed unimodal type, and the emission peak usually appeared at noon or afternoon, Diene. Seasonal changes are mainly the highest in summer, spring and autumn is lower.