大气二氧化碳浓度增加对木本植物BVOCs释放的影响

Effects of elevated atmospheric CO2 concentration on biogenic volatile organic compound emission from woody plants

植物挥发性有机化合物(biogenic volatile organic compounds,BVOCs)在近地表臭氧和二次有机气溶胶生成中有重要作用,而大气CO2浓度上升对植物BVOCs释放有显著影响。利用Meta-analysis方法对已发表的数据进行整合分析发现:(1)总体而言,大气CO2浓度增加会导致不同木本植物(常绿与落叶)BVOCs释放降低;(2)就不同木本植物BVOCs释放而言,大气CO2浓度增加主要导致落叶植物BVOCs释放速率降低,而常绿植物则以增加为主;(3)就植物释放BVOCs种类而言,大气CO2浓度增加显著降低异戊二烯的释放速率,对单萜烯释放速率则无显著影响。结果可为阐明陆地生态系统BVOCs释放对全球CO2浓度增加的响应提供依据。

Biogenic volatile organic compounds(BVOCs)play an important role in the formation of near-surface ozone and secondary organic aerosols.Elevated atmospheric CO2 concentration can significantly affect the BVOCs emission from plants.We carried out a meta-analysis with the related published data.Our results showed that:(1)BVOCs emission from different woody plants(evergreen vs.deciduous)significantly decreased with elevated atmospheric CO2 concentration.(2)In terms of different functional types,increased atmospheric CO2 concentration mainly reduced the BVOCs emission from deciduous plants but increased that from evergreen plants.(3)For BVOCs species from plants,elevated atmospheric CO2 concentration significantly reduced isoprene emissions from deciduous and evergreen plants,while it had no effect on monoterpene emissions.Our results can provide a basis for clarifying the response of BVOCs emission from terrestrial ecosystems to the elevated atmospheric CO2 concentration.