Seasonal dynamics of monoterpene ratio in <i>Picea obovata (Pinaceae) </i>needles
The monoterpene composition in Picea obovata L. needles was studied during vegetation period by vapour-phase sampling of volatile compounds and the subsequent quantitative gas chromatography analysis. The quantitative gas chromatography analysis of the monoterpene hydrocarbons and terpenoides of P. obovata needles indicated the presence of strong correlations between their mass portions. Identified components were arranged in two groups of pairs: 1 - α-pinene-camphor, camphene-camphor, camphen-limonene, α-pinene-camphene, limonene-camphor and 2 - α-pinene-bornyl acetate, camphene-bornyl acetate, camphor-bornyl acetate, limonene-bornyl acetate. Monoterpene content has different dynamics in summer and depends on the daytime.