Response of Ginkgo biloba growth and physiological traits to ozone stress
2022
Chen, Bo | Xu, Jingjing | Liu, Donghuan | Yang, Xinbing
Ginkgo biloba, the main greening tree species in Beijing, was used to study the effects of elevated ozone (O₃) concentrations on physiology and ecology using an open-top air chamber (OTC). We set three O₃ concentration gradients (NF: normal atmospheric O₃ concentration; NF40: normal atmospheric O₃ concentration plus 40 nmol/mol; NF80: normal atmospheric O₃ concentration plus 80 nmol/mol). Based on the theoretical basis of the coupling of O₃ and transpiration through stomata, the O₃ uptake from the leaf surface of G. biloba was studied under artificial control. The results showed that with the O₃ concentration increased, the leaves of G. biloba were damaged, stomatal density, stomatal aperture, stomatal size, net photosynthetic rate, transpiration rate, stomatal conductance, and chlorophyll content decreased, while intercellular CO₂ concentrations and relative conductivity increased. The monthly and daily variations in the liquid flow density of G. biloba decreased with the increase in O₃ concentration. Similarly, water consumption and the ozone uptake rate (FO₃₎ of G. biloba decreased with the increase in O₃ concentration: Water consumption by the entire tree under the NF40 and NF80 ozone concentrations decreased compared to NF, the rates of decline were 68.77% and 78.38%, respectively. The rates of FO₃ decrease were 15.48% and 31.04%, respectively.
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