Biogenic VOCs play an important role in producing ozone and secondary organic aerosols through photochemical reactions in the troposphere. In this study, terpenes emitted from akamatsu (Pinus densiflora), one of the dominant plants in Japan, that had been placed in a chamber with controlled temperature and light were investigated by the enclosure method combined with fast analysis type-gas chromatography (Fast-GC). The OH reactivity of the measured terpenes was also comprehensively investigated by comparison with the total OH reactivity measurement. Twenty-one kinds of terpenes including not only monoterpenes, but also oxygenated monoterpenes and sesquiterpenes were observed. While the concentration at the standard temperature of 30℃ did not show a seasonal dependence, the composition seasonally changed. The terpenes’ emission depended on the temperature but not on the light intensity. Additionally, it was shown that the stress by bugs caused an increase in the terpene emission. While the measured total OH reactivity was normally represented by the summation of terpenes’ OH reactivity, the difference greater than the measurement error was observed with the stress by the bugs. The difference might suggest the contribution of unmeasured VOCs. Further investigation of species not measured in this research, e.g. aldehydes, under the stress condition is required.