2024年4月19日 星期五
木荷枝叶挥发性有机物(VOCs)的季节差异及春季日变化
Seasonal difference and diurnal variation in spring of volatile organic compounds (VOCs) in branches and leaves of Schima superba
2022年 第31卷 第1期 页码[53-60]    下载全文[0.9MB]  
摘要

 为了明确木荷(Schima superba Gardn. et Champ.)枝叶挥发性有机物(VOCs)的成分组成和含量的变化规律,采用动态顶空采集法和热脱附-气质联用(TDS-GC-MS)技术,对木荷枝叶VOCs的成分组成和相对含量的季节差异及春季日变化进行了比较。结果表明:在4个季节木荷枝叶的VOCs中共鉴定出53种化合物,其中萜烯类化合物种类最多(11种);并且,木荷枝叶VOCs的化合物种类在春季最多(26种)、夏季次之(21种)、秋季较少(18种)、冬季最少(17种)。4个季节木荷枝叶的VOCs均表现为萜烯类化合物的总相对含量最高,且远高于其他类型化合物。木荷枝叶VOCs中萜烯类化合物的总相对含量由高到低依次为夏季、冬季、春季、秋季,并且,夏季、冬季和春季木荷枝叶VOCs中萜烯类化合物的总相对含量较为接近。春季、夏季和秋季木荷枝叶VOCs中的萜烯类化合物主要为长叶烯、龙脑和樟脑,而冬季木荷枝叶VOCs中的萜烯类化合物主要为D-柠檬烯、长叶烯和樟脑。不同季节木荷枝叶VOCs均包含特有成分,以春季最多(15种)、秋季最少(4种)。春季木荷枝叶VOCs的成分组成和相对含量日变化明显,化合物种类先减少后增多,在10:00和12:00种类同样多且最少(8种),在16:00最多(16种)。16:00时木荷枝叶VOCs中醛类化合物的总相对含量最高(38.14%),其余时刻木荷枝叶VOCs中萜烯类化合物的总相对含量最高。而且,木荷枝叶VOCs中萜烯类化合物的总相对含量先升高后降低,并在10:00达到峰值(84.64%)。基于上述研究结果,木荷枝叶在一年四季尤其是春季白天的大部分时间可释放大量对人体有益的萜烯类化合物,可作为营建保健型园林景观的树种。

Abstract

To clarify the variation rules of composition and contents of components of volatile organic compounds (VOCs) in branches and leaves of Schima superba Gardn. et Champ., seasonal difference and diurnal variation in spring of composition and relative contents of components of VOCs in branches and leaves of S. superba were compared by using dynamic headspace air-circulation method and thermal desorptiongas chromatography-mass spectrum (TDS-GC-MS) technique. The results show that 53 compounds are identified from VOCs in branches and leaves of S. superba in 4 seasons in total, in which, the number of compounds of terpenes is the most (11), and the number of compounds of VOCs in branches and leaves of S. superba in spring is the most (26), followed by summer (21), that in autumn (18) is few, and that in winter (17) is the fewest. The total relative contents of compounds of terpenes of VOCs in branches and leaves of S. superba in 4 seasons are the highest, and are greatly higher than those of the other types of compounds. The total relative contents of compounds of terpenes of VOCs in branches and leaves of S. superba from high to low are in the sequence of summer, winter, spring, autumn, and those in summer, winter, and spring are relatively close. Compounds of terpenes of VOCs in branches and leaves of S. superba in spring, summer, and autumn are mainly longifolene, borneol, and camphor, while those in winter are mainly D-limonene, longifolene, and camphor. VOCs in branches and leaves of S. superba in different seasons all contain unique compounds, which are the most in spring (15) and the fewest in autumn (4). The diurnal variations of component composition and relative content of VOCs in branches and leaves of S. superba in spring are evident, the number of compounds first decreases and then increases, which are the same and the fewest (8) at 10:00 and 12:00 and the most at 16:00 (16). The total relative content of compounds of aldehydes of VOCs in branches and leaves of S. superba at 16:00 is the highest (38.14%), while those of compounds of terpenes at the other times are the highest. In addition, the total relative content of compounds of terpenes of VOCs in branches and leaves of S. superba first increases and then decreases, and reaches the peak value (84.64%) at 10:00. Based on these results, branches and leaves of S. superba can release a great amount of compounds of terpenes which are beneficial to human body in 4 seasons of the year, especially at most of the day time in spring, it can be used as healthcare garden landscape tree species.

关键词木荷; 挥发性有机物(VOCs); 释放规律; 热脱附-气质联用(TDS-GC-MS)技术
Key wordsSchima superba Gardn. et Champ.; volatile organic compounds (VOCs); release rule; thermal desorption-gas chromatography-mass spectrum (TDS-GC-MS) technique
作者王金凤, 周琦, 陈卓梅
所在单位浙江省林业科学研究院, 浙江 杭州 310023
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下载次数664
基金项目浙江省省院合作林业科技项目(2020SY10)