Factors affecting monoterpene emission from Chamaecyparis obtusa

Abstract

Monoterpenes are major compounds emitted by plants and contribute to the formation of photochemical oxidants and secondary organic aerosols in the troposphere. We measured monoterpene emissions from Chamaecyparis obtusa, a major coniferous tree species in Japan, in both the field and the laboratory. Short-term monoterpene emission from C. obtusa was typically dependent on temperature but barely dependent on light intensity. We calculated the basal emission rate E s assuming β = 0.09 in the G93 model. Three individual trees showed similar, but large seasonal variations in E s ; e.g., 0.21-5.42 µg g DW -1 h -1 for a tree showing the highest emission rate. The emission rate was much higher in winter and autumn. Although E s values averaged over 4 seasons indicated that C. obtusa is an intermediate emitter among coniferous trees, our results suggest that the large seasonal variation in E s should be considered in estimating annual monoterpene emission from this species. Furthermore, we found a significant effect of branch-to-branch touching by vibration on monoterpene emission from this species, suggesting that wind effect should be considered in the future for more precise emission estimation.

Fragmentation and Reaction Rate Constants of Terpenoids Determined by Proton Transfer Reaction-mass Spectrometry

“…Mochizuki et al, 2011). This is feasible because the sum of these ion counts remains constant at different water vapor concentrations in the sample air (Tani et al, 2004).…”

Workplace Concentrations and Exposure Assessment of Monoterpenes in Rosemary‐ and Lavender‐growing Greenhouses

“…This task causes leaves and branches to touch each other. The vibrational stimulus has been reported to increase monoterpene emission from a herb (Melissa officinalis) 10) . M. officinalis, as well as R. officinalis and L. angustifolia used in our study, has oil glands on abaxial leaf surfaces.…”

“…In laboratory measurements, monoterpene emissions have been shown to be increased by vibration stimulus 10) , mechanical wounding 11) and leaf wet conditions 12) . Therefore, greenhouse tasks including handling and watering plants may stimulate the monoterpene storage organs of the plants and accelerate monoterpene emissions.…”

Development of a reliable method to determine monoterpene emission rate of plants grown in an open-top chamber

“…Generally, monoterpene emissions from coniferous trees were accelerated by contact stimuli (e.g., Yatagai et al, 1998;Juuti et al, 1990;Mochizuki et al, 2011). Juuti et al (1990) reported that rough handling increased monoterpene emissions from Pinus radiata 10 to 50 times that under normal conditions, even though experiments were conducted at the same temperature.…”