摘要
以生长在沈阳市区内的银杏及油松为试材,开顶式熏气室模拟升高O3浓度(80 nmol.mol-1)和正常大气O3浓度(≈30nmol.mol-1)条件,采用GC-FID技术对银杏及油松的异戊二烯和7种单萜类物质的排放速率进行测定,探讨高浓度O3对单株银杏及油松挥发性有机物排放规律的影响.结果表明,O3浓度增高可以显著提高银杏和油松的异戊二烯排放速率(p<0.05),及银杏Δ3-蒈烯的排放速率(p<0.05),其分别达到1.96、9.71和0.09μg.(g.h)-1,而对于其他单萜物质的排放速率,2种树木对高浓度的O3熏蒸均没有表现出显著的变化;树种不同,排放的BVOCs组成也不同,自然条件下银杏排放的BVOCs以异戊二烯为主,而油松以α-蒎烯为主;高浓度O3熏蒸下油松释放的异戊二烯达到其BVOCs组成的64.73%,增加大气O3浓度改变了树木挥发性有机物的组成比例.因此,O3浓度升高对银杏及油松BVOCs排放规律具有显著影响.
To study the impact of elevated tropospheric O3 concentrations on BVOCs emissions by Pinus tabulaeformis and Ginkgo biloba in urban area, the trees were exposed in open-top chambers. Two ozone treatments were established： ambient air （ ≈ 30 nmol-mol^-1 ） （CK） and elevated O3 concentrations （80 nmol· mol^-1） （O3 ）. Elevated O3 concentrations significantly induced isoprene to emit for Pinus tabulaeformls and Ginkgo biloba （p 〈0.05）, and △3-carene for Ginkgo biloba （p 〈 0.05）. The emission rates were increased to 1.96, 9.71 and 0.09 μg/（g·h）^-1 , respectively. There were no significant differences between ozone fumigation treatments for the other monoterpenes. At the same time, the relative abundances of the monoterpenes and isoprene were to be different between tree species and effect by O3 exposure. In CK chambers, the dominate BVOCs emitted by Ginkgo biloba was isoprene, and a-pinene for Pinus tabulaeformis. In the elevated O3 chambers, the isoprene accounted for 64.73% of Pinus tabulaeformis BVOCs. To sum up, the BVOCs emitting patterns were influenced by elevated O3 significantly.
出处
《环境科学》
CAS
CSCD
北大核心
2008年第2期300-304,共5页
Environmental Science
基金
国家自然科学基金重点项目(90411019)
关键词
生物源挥发性有机化合物(BVOCs)
O3浓度升高
银杏
油松
biogenic volatile organic compounds （BVOCs）
elevated atmospheric O3 concentration
Ginkgo biloba
Pinus tabulaeformis
