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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (4): 141-147.doi: 10.11707/j.1001-7488.20150418

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Diurnal Rhythm of Emission of Volatile Compounds Emission from Acer truncatum and Cedrus deodara

Song Xiuhua1, Li Chuanrong2, Xu Jingwei3, Hu Dingmeng3, Wang Chao1   

  1. 1. College of Horticulture and Science Engineering, Shandong Agricultural University Tai'an 271018;
    2. Taishan Forest Ecosystem Research Station/Key Laboratory of Agricultural Ecology and Environment, Shandong Agricultural University Tai'an 271018;
    3. Shandong Research Institute of Forestry Jinan 250014
  • Received:2014-05-21 Revised:2014-11-07 Online:2015-04-25 Published:2015-05-20

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Abstract:

【Objective】Most volatiles released from green plants have significant physiological activity, such as regulating plant growth, enhancing its resistance, inhibiting the growth of air microorganisms, and also producing different influences on human physiology and psychology. Acer truncatum and Cedrus deodara are common urban greening tree species, typical representative of hardwoods and conifers in Northern China. In this paper, the diurnal rhythm of volatiles released from the two species was detected and the environmental impact of the volatiles was investigated, to provide scientific reference for the urban green space recreation construction by proper tree species configuration and create the green environment more conducive to human health. 【Method】The sunward leaves and branches of perennial and heathy A. truncatum and C. deodara were collected, and the volatiles were measured by using the SPME-GC-MS technique every 3 hours from 8:00 to 5:00 in the mid July. At the same time the temperature and humidity of the environment were measured. The SPSS software was used to analyze the data. 【Result】 1) The C6 and C8 esters, alcohols, aldehydes and terpenes were the dominant components released from A. truncatum. The 3-hexenyl acetate, hexyl acetate, 3-hexen-1-ol, 3-hexenal, and β-caryophyllene accounted for 70% of the total volatiles, which made leaves give up the green leaf fragrance. Different compounds had different release patterns. The C8 esters, a major volatile, had the releasing peak at 14:00, and the lowest releasing point at 5:00. The C15 sesquiterpenes appeared two peaks and two valleys of the releases, the peaks were at 17:00 and 5:00, and the valleys were at 8:00 and 23:00, respectively. The correlation analysis showed that there was positive correlation between 3-hexen-1-ol and 3-hexenal, and negative correlations between 3-hexenyl acetate with 3-hexen-1-ol and 3-hexenal. No significant correlations were found between other compounds. 2) The volatiles of C. deodara leaves were mainly composed of terpenes which accounted for 84% of the total volatiles. The main components were α, β-pinene, β-myrcene, D-limonene, β-caryophyllene and Germacrene D, which made the branches and leaves give up resin odor. Most of monoterpenes, such as α, β-pinene, β-myrcene, and D-limonene, had their release peaks at 14:00, and the lowest release valleys occurred from 23:00 to 2:00. Most of sesquiterpenes, such as β-caryophyllene, and Germacrene D, had their release peaks at 17:00 and 2:00, and the release valleys at 23:00 and 5:00. The correlation analysis indicated that there were positive correlations between α, β-pinene, β-myrcene and D-limonene, and positive correlation between β-caryophyllene and Germacrene D. However, no significant correlations were found between other monoterpenes and sesquiterpenes. 3) The volatile release was also influenced by environmental factors, except with diurnal rhythm. Total peak area of volatiles was positively correlated with temperature and negatively correlated with relative humidity. 【Conclusion】The main components of the volatiles from A. truncatum were C8 esters, and the main components of volatiles from C. deodara were C10, C15 terpenes, which were related with volatiles synthesis pathway. Different compounds had different diurnal rhythms. The volatile emission rates increased with the temperature and declined with the relative humidity.

Key words: Acer truncatum, Cedrus deodara, volatile compounds, diurnal cycle

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