Experimental warming alleviates the adverse effects from tropospheric ozone on two urban tree species.
Experimental warming alleviates the adverse effects from tropospheric ozone on two urban tree species.
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DOI：
10.1016/j.envpol.2020.115289
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发表时间：
2020-08
影响因子：
8.9
通讯作者：
Sheng Xu;Yijing Wang;Weiwei Zhang;Bo Li;Zhong Du;Xingyuan He;Wei Chen;Yue Zhang;Yan Li
中科院分区：
文献类型：
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作者：
Sheng Xu;Yijing Wang;Weiwei Zhang;Bo Li;Zhong Du;Xingyuan He;Wei Chen;Yue Zhang;Yan Li
在包括中国在内的世界许多城市，大气变暖和对流层臭氧浓度上升经常同时发生，对城市树木的健康状况产生不利影响。然而，关于气温升高(IT)和臭氧(EO)暴露对城市树木物种的综合和交互影响的信息很少。在这里，银杏和白杨的幼苗被置于IT(+2℃的环境空气温度)和/或EO(+2倍的环境空气臭氧浓度)下，用开顶式气室进行一个生长季节的试验。单独施药对生长前期的生理代谢没有显著影响，但显著提高了光合作用参数、抗氧化酶活性(P<；P<；0.05)。EO单独降低了生理参数，但增加了氧化应激。与EO单独暴露相比，IT和EO组合生长的植物表现出更高的抗氧化和光合作用活性。IT和EO对净光合速率、气孔导度、水分利用效率、PSII光化学最大量子效率、PSII实际量子效率、酶活性、地上生物量和根冠比均有显著互作效应(P<；P<0.05)。这些结果表明，在一个生长季节内，IT减轻了EO对受试植物的不利影响。此外，我们还发现银杏对IT和EO都比白杨更敏感，这表明银杏可能是气候变暖和空气污染的一个很好的指示物种，特别是在环境条件下，因为它们共存于城市地区。
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 bilobaandPopulus alba‘Berolinensis’seedlings were subjected to IT (+2 °C of ambient air temperature) and/or EO (+2-fold ambient air O3concentrations) 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 thatG. bilobawas more sensitive thanP. alba ‘Berolinensis’to both IT and EO, suggesting thatG. bilobamay be a good indicator species for climate warming and air pollution, particularly under environmental conditions as they co-occur in urban areas.