樟树叶片挥发性有机物释放季节动态和日动态变化规律

Seasonal and diurnal change laws of volatile organiccompounds from leaves of Cinnamomum camphora

采用动态顶空采集法和热脱附-气质联用技术,对不同季节和一天内不同时间点樟树叶片释放的挥发性有机物(VOCs)成分含量及其变化规律进行了分析。结果表明:全年樟树叶片释放的VOCs共计78种,其中萜烯类(19种)和烷烃类(18种)化合物种类较多;32种樟树叶片释放的挥发性成分相对含量在不同季节存在显著差异(P<0.05);3月份释放的VOCs种类最为丰富,萜烯类化合物相对含量最高(43.49%),主要为1-石竹烯、D-柠檬烯和α-蒎烯,其他月份释放的VOCs则以烷烃类和醇类为主;春季,樟树叶片在绝大多数时间点释放VOCs以萜烯类化合物为主,且早上8:00释放的萜烯类化合物相对含量最大。综上结果认为,樟树是营造保健型生态园林的理想树种,其叶片释放的VOCs中富含多种对人体健康有益的萜烯类化合物,春季的早晨是进行森林康养活动的最佳时间。

Volatile organic compounds(VOCs)were collected in different seasons and different times of the day by dynamic headspace air-circulation method,and the relative contents and the change laws were also analyzed using the thermal desorption system gas chromatography/mass spectrum(GC-MS).The results were as follows:Cinnamomum camphora leaves released 78 types of VOCs during the whole year,and the types of terpenes(19)and alkanes(18)were more abundant than those of other compounds;The relative contents of 32 types of VOCs had significant differences(P<0.05)among different seasons;The number of types in March was the most abundant,and the relative contents of terpenes reached 43.49%,including 1-Caryophyllene,D-Limonene andα-pinene,and the types of VOCs released from C.camphora leaves in other months were mainly of alkanes and alcohols;In spring,the relative contents of VOCs released at most of the time were all mainly of terpenes,and the relative contents of terpenes released at 8:00 am were the highest.Therefore,C.camphora is an ideal species for ecological and heathy landscape,and the VOCs released from C.camphora leaves are rich in kinds of terpenes compounds,which are beneficial for human health,and spring and morning are the best time for forest recreation.