Abstract: The emission characteristics, emission rate and its diurnal variation of one of the main Mediterranean macchia (Pistacia lentiscus) in Noak's Ark reserve, Sardinia, Italy have been studied using Dynamic Sampling and GC-MS method. Compounds such as α-pinene, β-pinene, sabinene, Limonene, p-cymene, camphene, β-phellandrene, β-myrcene, α-terpinene, α-phellandrene, 3-carene and isoprene were investigated. The emissions of the terpenes account for 99.4% of the total emission, while the emission of isoprene only accounts for 0.6%. Of all the terpenes, the main emitted compounds are α-pinene, β-pinene, sabinene and Limonene, which account for 64.5%、18.4%、6.0% and 5.9% of the total emission respectively. The emission rates of terpenes increase with temperature, showing a positive exponential correlation. Under normal state (temperature of 303K), the emission rate of Pistacia lentiscus is 2.72±0.72μg/g·h. It's determined that β value of Pistacia lentiscus in its emission rate formula is 0.128K^-1, which is in good agreement with the values (0.057～0.144K^-1) in the literature.

Key words: mobile sampling method, GC-MS, terpenoid compounds, diurnal variation, emission rate

摘要： 采用流动式采样与气相色谱-质谱联用法研究了意大利撒丁岛Noak's Ark自然生态区主要灌木黄连木（Pistacia lentiscus）萜烯类化合物排放特征、排放速率及其日变化。排放物种包括α-蒎烯、β-蒎烯、桧烯、苎烯、戊花烃、莰烯、β-水芹烯、β-香叶烯、α-松油烯、α-水芹烯和3-蒈烯，以及少量异戊二烯。萜烯类化合物占总排放的99.4%，异戊二 烯仅占0.6%。在萜烯类化合物中，主要排放物为α-蒎烯、β-蒎烯、桧烯和苎烯，分别占总排放的64.5%、18.4%、6.0%和5.9%。萜烯排放速率随温度的升高而增加，呈指数相关。在标准条件下（303K），黄连木树种的排放速率为2.72±0.72μg/g·h。黄连木排放速率公式中β值为0.128K^-1，与文献值0.057～0.144K^-1相一致。

关键词: 流动式采样法, 色质联用法, 萜烯类化合物, 日变化, 排放速率