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全球每年从植物中释放出精油为主的烃类化合物有１．７５亿ｔ之多，１万ｍ２的针叶树林一昼夜释放出的精油为３～５ｋｇ，阔叶树林约为２ｋｇ。从植物中释放出精油量的大小，与植物中精油的含量的大小是一致的。树木中精油含量较为丰富的有：松科（如松柏、侧柏、杉木），樟科
Globally, there are 175 million tons of hydrocarbons released annually from plants, and the essential oil released by 10,000-square-foot coniferous forests is 3 to 5 kg a day and night, and the broad-leaved forest is about 2 kg. The amount of essential oil released from the plant is the same as the amount of essential oil in the plant. Trees are rich in essential oils are: Pinaceae (such as pine, Platycladus orientalis, fir), Lauraceae