采用动态顶空吸附采集法对侧柏春季释放的挥发物(Volatile Organic Compounds,VOCs)进行采集,同时利用Li-cor6400便携式光合系统测定仪测定其主要光合生理指标,分析了侧柏春季挥发物的主要成分、日变化规律及其影响因子.结果表明:(1)侧柏挥发物成分包括9类106种,主要挥发物成分是萜烯类化合物.对人体有益的有机挥发物包括萜烯类化合物、癸醛和乙酸乙酯,对人体有害的化合物包括三氯甲烷、笨和甲苯;(2)春季侧柏总挥发物(TVOCs)浓度日变化曲线呈"三峰两谷"型,5:00、13:00、19:00呈现高峰,凌晨23:00-1:00、下午17:00呈现低谷,对人体有益的成分出现在5:00、9:00、15:00、19:00,对人体不利的成分主要出现在中午15:00和夜间21:00-1:00且浓度较低;(3)温度较高、光照较强、湿度较低的时段总挥发物浓度总体较高,反之较低.蒸腾速率、净光合速率、气孔导度的日变化规律与总挥发物浓度日变化一致性较强.总挥发物浓度变化与蒸腾速率、净光合速率、气孔导度相关性极显著,与光照相关性显著,而与温度和湿度相关性不显著.%The samples of Volatile organic compounds (VOCs)from Platycladus orientalis were collected by the method of absorption thermodesorption, the physiological characteristics of the species were measured by Li-cor6400.The results showed: ( 1 ) There were 106 kinds of VOCs belonging to 9 classes in amount, the main VOCs of the P.orientalis in spring were terpenes.The VOCs beneficial to human being included terpene, ethyl acetate, decanal, and the harmful VOCs were chloroform, benzene, and toluene.(2) The total volatile organic compounds (TVOCs) concentration followed a “three peaks and two vales” pattern, the peaks were at 5:00, 13:00, and 19:00, and the vales were at 17:00 and 23:00-1:00.The appearance time of healthful components were at 5:00, 9:00, 15:00, and 19:00; the appearance time of unwholesome components were at 15:00, 21:00-1:00.(3) When the temperature was high, the illumination was strong,the humidity was low, the TVOCs concentration would be high, conversely, it would be low.The diurnal variation of transpiration rates, photosynthetic rates and the stomatal conductance were accorded with the concentration of TVOCs.It showed a very significantly positive relationship between the physiological characteristics and TVOCs concentration; a significantly positive relationship between the illumination and TVOCs concentration.
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