Towards long-term sustainability of stomatal ozone flux monitoring at forest sites

作者：Elena Paoletti, Pierre Sicard, Yasutomo Hoshika, Silvano Fares, Ovidiu Nicolae Badea, Diana Pitar, Ionel Popa, Alessandro Anav, Bárbara Bâesso Moura, Alessandra De Marco · 发表于：Sustainable Horizons · 年份：2022 · DOI：10.1016/j.horiz.2022.100018 · 被引用次数：29 · 研究领域：Plant responses to elevated CO2、Atmospheric chemistry and aerosols、Air Quality and Health Impacts

Stomatal O 3 flux accumulated over the growing season (or phytotoxic ozone dose above a y threshold of uptake, PODy) is nowadays considered as the best biologically based metric to assess O 3 injury to vegetation and establishing critical levels (CLs). So far, CLs have used biomass losses as forest-health indicator in experimental research. Ozone-induced biomass losses of adult forests, however, are difficult to assess. We stress a need to reconcile present CLs and dose-response functions to estimate O 3 -induced biomass losses. In fact, a clear discrepancy emerges when comparing CL exceedances calculated from WRF-Chem results and biomass losses estimated based on the presently available dose-response functions for different forest types. We synthesize recent evidence that visible foliar O 3 injury (VFI) recorded annually in large-scale forest surveys may be used as forest-health indicator and coupled with active O 3 monitoring in setting epidemiology-based CLs for forest protection. Bridging experimental and monitoring research is needed for validation and parameterization of field results and models, with the O 3 free-air controlled exposure (FACE) facilities as a reliable experimental tool. In fact, VFI is well correlated to O 3 -induced biomass loss at O 3 FACE experiments, and POD1 and O 3 tolerance (when characterized as leaf mass per area (LMA) directly affect VFI under field conditions. POD1 shows a much stronger causality than the O 3 exposure index AOT40 in affectin...