Abstract
Three typical Japanese needle-leaved trees (Cryptomeria japonica, Chamaecyparis obtuse, and Pinus densiflora) and a broadleaf tree (Quercus serrata) were exposed to ozone concentrations of 200 ppb and 100 ppb in a growth chamber. During the 3-day experiment, the species were exposed to ozone on the second day and BVOC emissions were measured daily from 7 a.m. to 7 p.m. Due to ozone exposure, monoterpene emissions from needle-leaved trees decreased and this effect continued until the next day. α-pinene emission was strongly affected by the ozone concentration. β-pinene was also affected by the ozone concentration, but the dependency of ozone concentration was weaker than α -pinene. Isoprene emission from Quercus serrata was slightly decreased by 200 ppb ozone exposure, but was not significantly affected by 100 ppb ozone exposure.
