TERRAPUB Geochemical Journal
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Geochemical Journal, Vol. 45 (No. 3), pp. e15-e22, 2011

EXPRESS LETTER

Factors affecting monoterpene emission from Chamaecyparis obtusa

Tomoki Mochizuki,1 Yukiko Endo,1 Sou Matsunaga,2 Jie Chang,3 Ying Ge,3 Chengai Huang4 and Akira Tani5

1Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
2JATOP Department, Japan Petroleum Energy Center, 4-3-9 Toranomon, Minato-ku, Tokyo 105-0001, Japan
3College of Life Sciences, Zhejiang University, Hangzhou 310058, P.R. China
4Shaoxing University, Shaoxing 312000, P.R. China
5Institute for Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan

(Received March 29, 2011; Accepted May 13, 2011; Online published June 3, 2011)

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 Es assuming β = 0.09 in the G93 model. Three individual trees showed similar, but large seasonal variations in Es; e.g., 0.21-5.42 μg gDW-1h-1 for a tree showing the highest emission rate. The emission rate was much higher in winter and autumn. Although Es 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 Es 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.
Key words: biogenic emission, seasonal variation, vibration, leaf temperature, light intensity


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