Silvicluture and Forest Ecological Studies, Hokkaido University, Sapporo 060-8689, Japan.
Environ Pollut. 2012 Jul;166:152-6. doi: 10.1016/j.envpol.2012.03.013. Epub 2012 Apr 12.
We investigated the effects of ozone and leaf senescence on steady-state stomatal conductance and stomatal response to light variation. Measurements were carried out in a free-air ozone exposure experiment on a representative deciduous broadleaved tree species in Japan (Fagus crenata). Both steady-state and dynamic stomatal response to light variation varied intrinsically with season due to leaf senescence. Ozone induced the decrease in steady-state leaf gas exchange and the sluggish stomatal closure progressively. These findings suggest that ozone reduces the ability of plants to adapt to a fluctuating light environment under natural conditions, and therefore impairs plant growth and ability to control water loss.
我们研究了臭氧和叶片衰老对稳定态气孔导度和气孔对光变化响应的影响。在日本代表性的落叶阔叶树种（栗）的自由空气臭氧暴露实验中进行了测量。由于叶片衰老，稳定态和动态气孔对光变化的响应都随季节内在变化。臭氧导致稳定态叶片气体交换和迟钝的气孔关闭逐渐减少。这些发现表明，臭氧降低了植物在自然条件下适应波动光照环境的能力，从而损害了植物的生长和控制水分损失的能力。
