极端热事件改变了BVOC对高臭氧的反应:从生理学到排放模式
Shuangjiang Li1,2,3, Xiangyang Yuan1,2, Shenglan Li4
1State Key Laboratory of Climate System Prediction and Risk Management, School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Environmental science & technology
|June 13, 2025
概括
极端高温事件显著抑制了树种类中臭氧诱导的生物源挥发性有机化合物 (BVOC) 排放. 虽然异二烯排放量在加热后恢复,但单二烯反应变得不那么可预测,影响了未来的气候预测.
科学领域:
- 植物生理学和大气化学
- 研究植物对环境压力因素的反应.
- 生物性挥发性有机化合物 (BVOC) 研究
背景情况:
- 升高的臭氧 (O3) 和极端热量 (EH) 影响植物生长和BVOC排放.
- 对于EH和O3对BVOCs的综合作用尚不清楚.
- 树种类如Quercus nuttallii (异烯) 和Quercus acutissima (单烯) 是主要的BVOC排放者.
研究的目的:
- 为了确定极端高温事件如何调节两个树物种中臭氧诱导的BVOC排放.
- 研究合成能力和反应性氧物种 (ROS) 在热应激O3反应中的作用.
- 为预测未来气候变化情景下的BVOC排放提供洞察力.
主要方法:
- 暴露Quercus nuttallii和Quercus acutissima在三个月的时间内进行五次O3处理.
- 将植物置于为期两周的极端高温事件 (EH).
- 测量异烯和单烯排放率,合成能力和ROS水平.
主要成果:
- 异二烯和单二烯排放都对O3表现出一种hormetic反应 (低剂量刺激,高剂量抑制).
- 在所有O3处理中,EH显著抑制了异烯和单烯排放率.
- 异二烯排放量在EH后恢复,除了在O3最高的情况下;EH转移了异二烯的O3反应机制.
结论:
- 极端的热量极大地改变了植物对臭氧的反应,影响了BVOC排放.
- 驱动BVOC对臭氧反应的机制在热应激下发生变化.
- 这些发现对于在气候变化中准确的区域BVOC排放建模至关重要.
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