沈阳市四种乔木树种BVOCs排放特征

Emission characteristics of biogenic volatile organic compounds from four tree species in Shenyang,China

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。

By the methods of thermal desorption and gas chromatography,the emission characteristics of biogenic volatile organic compounds（BVOCs）from Populus alba × berolinensis,Salix babylonica,Ulmus pumila,and Gleditsia japonica）in Shenyang urban area were studied.The BVOCs emissions varied with test tree species.P.alba × berolinensis and S.babylonica had obviously higher BVOCs emissions than the other two tree species,and mainly emitted isoprene;while U.pumila and G.japonica mainly released limonene.The BVOCs emissions from test tree species had obvious diurnal and seasonal variation patterns,i.e.,with a peak at noon or afternoon and less isoprene released at night,and higher in summer than in spring and autumn.