Measurements of oxygenated volatile organic compounds emitted from tropical plants

热带植物排放的挥发性有机化合物(VOC)是在东南亚低地热带森林的代表性物种生长的温室中以及马来西亚帕索的热带雨林中测量的。共48种VOCs，其中含氧VOCs 25种(半挥发性醛如正庚醛、正庚醛、乙酸己烯酯、6-甲基-5-庚烯-2-酮、3-甲基呋喃、2-甲基呋喃等)。在所调查的30种热带植物的排放气体中检出。研究发现，在白天，半挥发性醛的释放速率增加。叶片表面蜡质的臭氧化作用以及叶片的直接排放是醛类物质释放的可能途径。一些常见的热带植物(某些类型的蕨类植物和龙脑香科植物)也有大量的甲基氯排放。每克干叶每小时的排放速率在0.1到3.7微克之间，这表明热带植物可以解释很大一部分错过的氯甲烷来源。研究发现，长有附生地衣的龙舌兰叶片大大减少了甲基氯的排放。

Volatile organic compounds (VOCs) emitted from tropical plants were measured in a greenhouse where representative species from lowland tropical forests of South East Asia grow, as well as in a tropical rainforest at Pasoh, Malaysia. Forty eight kinds of VOCs including 25 oxygenated VOCs (semi-volatile aldehydes such as nonanal and decanal, 3-hexenyl acetate, 6-methyl-5-hepten-2-on, 3-methyl furan, 2-methyl furan etc.) were detected in the emission gases from the thirty species of tropical plants investigated. It was found that semi-volatile aldehydes emission rates were increased during the daytime. Ozonolysis of leaf-wax at the surface, as well as the direct emission from leaves, were possible pathways for the aldehydes emissions. Large emission of methyl chloride from some common tropical plants (certain types of ferns and Dipterocarpaceae) was also found in this study. The emission rate ranged from 0.1 to 3.7 ug per gram dry leaf per hour, suggesting that tropical plants could explain a large portion of missing methyl chloride source. It was found that dipterocarp leaves with epiphytic lichens greatly reduced emission of methyl chloride.