Essential oils extracted from mature and thinned Cunninghamia lanceolata using steam distillation were subjected to gas chromatography(GC)-mass spectrometry analysis of the chemical composition.Quantification was performed using the GC peak area normalization method.Sixty-five compounds were identified in the mature timber of C.lanceolata,accounting for 81.377％of the total essential oils,and the major constituent was cedrol(37.791％).A total of 59 compounds were identified in the thinning timber of the C.lanceolata,accounting for 91.724％of the total essential oils.The major constituent was cedrol(27.196％).The axial parenchyma is the main tissue for storing the essential oils in C.lanceolata.Using a biological digital microscope,we determined and analyzed the tissue proportion of the axial parenchyma in two species of C.lanceolata.The present study revealed that the average proportion of parenchyma was 0.821％and 0.406％in mature and thinned C.lanceolata,respectively.The differences in the C.lanceolata tissue structure affect the content and proportion of essential oils in C.lanceolata.Understanding the differences in the essential oil components of C.lanceolata provides a scientific basis for the efficient development of essential oils and meet different product needs.
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