Experimental warming alleviates the adverse effects from tropospheric ozone on two urban tree species. (1st January 2021)

• Record Type: Journal Article
• Authors: Xu, Sheng; Wang, Yijing; Zhang, Weiwei; Li, Bo; Du, Zhong; He, Xingyuan; Chen, Wei; Zhang, Yue; Li, Yan; Li, Maihe; Schaub, Marcus
• Is Part Of: Environmental pollution. Volume 268(2021)Part A
• Publication Date: 2021-01-01
• Subjects: Climate change -- Ginkgo biloba -- Oxidative stress -- Photosynthesis -- Physiological response -- Poplar; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.115289
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Atmospheric warming and increasing tropospheric ozone (O3 ) concentrations often co-occur in many cities of the world including China, adversely affecting the health status of urban trees. However, little information is known about the combined and interactive effects from increased air temperature (IT) and elevated O3 (EO) exposures on urban tree species. Here, Ginkgo biloba and Populus alba 'Berolinensis' seedlings were subjected to IT (+2 °C of ambient air temperature) and/or EO (+2-fold ambient air O3 concentrations) for one growing season by using open-top chambers. IT alone had no significant effect on physiological metabolisms at the early growing stage, but significantly increased photosynthetic parameters, antioxidative enzyme activities ( P < 0.05). EO alone decreased physiological parameters except for increased oxidative stress. Compared to EO exposure alone, plants grown under IT and EO combined showed higher antioxidative and photosynthetic activity. There was a significant interactive effect between IT and EO on net photosynthetic rate, stomatal conductance, water use efficiency, the maximum quantum efficiency of PSII photochemistry, the actual quantum efficiency of PSII, enzyme activities, aboveground biomass and root/shoot ratio ( P < 0.05), respectively. These results suggested that during one growing season, IT mitigated the adverse effect of EO on the tested plants. In addition, we found that G. biloba was more sensitive than P. alba 'Berolinensis' to both IT and EO, suggesting that G. biloba may be a good indicator species for climate warming and air pollution, particularly under environmental conditions as they co-occur in urban areas. Graphical abstract: Image 1 Highlights: Increased temperature led to enhanced above-ground biomass of urban tree species. Elevated O3 inhibited growth and photosynthesis of Ginkgo biloba and poplar. Increased air temperature mitigated the negative impact from elevated O3 on growth. Significant interactive effects between increased temperature and O3 pollution were found. G. biloba was more sensitive than poplar to increased temperature and elevated O3 . Abstract : There was a significant interactive effect between increased air temperature and elevated O3 on growth and physiological changes of urban tree species.