Extreme Heat Event Alters BVOC Responses to Elevated Ozone: From Physiology to Emission Patterns

作者：Shuaitong Li, Xiangyang Yuan, Shenglan Li, Yuqing Zhou, Shenglei Wang, Kun Zhang, Evgenios Agathokleous, James D. Blande, Zhaozhong Feng · 发表于：Environmental Science & Technology · 年份：2025 · DOI：10.1021/acs.est.5c01132 · 被引用次数：8 · 研究领域：Air Quality and Health Impacts、Climate Change and Health Impacts、Atmospheric chemistry and aerosols

Extreme heat and elevated ozone (O 3 ) significantly affect plant growth and secondary metabolism, including biogenic volatile organic compound (BVOC) emissions. However, the impact of the extreme heat events (EHs) on the O 3 -induced BVOC emissions remains unclear. Here, Quercus nuttallii (an isoprene emitter) and Q. acutissima (a monoterpene emitter) were exposed to five O 3 treatments for three months and subjected to a two-week EH. The emission rates of isoprene and monoterpenes, their synthesis capacities, and reactive oxygen species (ROS) levels were determined to investigate how heat stress modulates O 3 effects. Both BVOC types showed a hormetic response to O 3, with low doses of O 3 stimulating emissions and high doses suppressing them. Isoprene (Hedges’ g = 2.91) and monoterpene (Hedges’ g = 2.52) emission rates were inhibited by short-term EH across the five O 3 treatments. However, isoprene emission rates generally recovered during the post-EH period, except under the highest O 3 exposure (NF80). EH also shifted isoprene’s response to O 3 from being synthesis-driven to ROS-driven. Although the monoterpene emission rate response to O 3 was driven by synthesis capacity in the pre-EH period, this response became less explainable by either factor post-EH. These findings emphasize the profound effects of EH on the BVOC response to O 3, providing crucial insights for predicting regional BVOC emissions under future climate scenarios.