臭氧浓度升高对植物源挥发性有机化合物(BVOCs)影响的研究进展

伴随地表臭氧(O_3)浓度在全球范围内的普遍上升,针对植物源挥发性有机化合物(biogenic volatile organic compounds,BVOCs)与地表O_3之间复杂的交互作用,本文综述了O_3浓度升高对BVOCs影响方面取得的研究进展,并对未来研究提出了展望.研究进展主要包括BVOCs应对单因子O_3胁迫的影响因素(如BVOCs种类,植物功能类型,植物O_3敏感性及O_3胁迫程度),以及O_3分别与升温/二氧化碳(CO_2)/干旱/氮(N)沉降等因子复合对BVOCs释放的影响.虽然O_3胁迫不影响BVOCs释放的研究最多,但O_3胁迫的降低作用在异戊二烯和落叶树种的研究中更突出,增加的结果更多地出现在单萜(MTs)、常绿植物和急性熏蒸的实验里. O_3与升温/N沉降复合处理增加MTs释放,O_3与CO_2复合处理降低了异戊二烯释放.鉴于研究样本的稀缺,建议加强该领域研究,同时要考虑短期和长期处理、个体和生态系统水平研究的差异;加强以O_3为主的多因子复合及生物与非生物多重胁迫对BVOCs影响的研究,以便更好评估陆地生态系统BVOCs对当前及未来O_3污染情景的响应,为今后大气污染防治提供有价值的理论支撑.

Effects of Elevated Ozone on Biogenic Volatile Organic Compounds (BVOCs) Emission: A Review

With the global increase of tropospheric ozone (O₃) and complex interactions between biogenic volatile organic compounds (BVOCs) emissions and tropospheric O₃ concentrations, this review summarizes current research progress and future research prospects in terms of the effects of elevated O₃ on BVOCs emissions. The main progress included impacts of BVOCs categories, plant functional types, O₃ sensitivity of plants, the O₃ stress level on the response of BVOCs emissions to single O₃ stress, and the combined effects of elevated O₃ and temperature, carbon dioxide (CO₂), drought, and nitrogen (N) deposition. Results indicated that most published results reported no change in BVOCs emissions in response to increasing O₃ concentration. Specifically, decreasing effects of O₃ on BVOCs emissions were more obvious in studies on isoprene and deciduous species, whereas studies on monoterpenes and evergreen plant species showed more results with an increasing trend as well as acute O₃ exposure experiments. There was an increased tendency of monoterpene emissions to the combined effects of O₃ and temperature or N deposition. However, the combined effects of O₃ and CO₂ decreased isoprene emissions. Given that studies on the effects of O₃ on BVOCs emissions remain scarce, more complete experiments are needed that consider differences between short-term and long-term or individual-level and ecosystem-level. Furthermore, future research should strengthen the multi-factor interactive studies, particularly on O₃ and other global change components and biotic and abiotic stresses, to assess BVOCs emissions from terrestrial ecosystems in response to O₃ pollution both currently and in the future, which will provide valuable theoretical support to air pollution control.