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利用色谱质谱(GC-MS)技术,首次在60个贡嘎山(海拔1230～4500m)和西昆仑山(海拔1300～5500m)表土以及6种贡嘎山木本植物中检测到8个(7-14)-甲氧基十六酸和9个(9-17)-甲氧基十八酸同分异构体化合物.其中甲氧基十八酸占绝对优势;而且,甲氧基在第9和第10个碳位的异构体都较丰富,随着取代基的碳数增大,相应异构体的丰度依次降低.在以阔叶林和针叶林为主的贡嘎山表土样品中,广泛存在甲氧基脂肪酸化合物,并在6种树叶中都能检测到;而在主要分布山地荒漠和高寒荒漠的西昆仑山,除了可能出现山地森林草原或半灌木荒漠的较窄高度范围外,大部分表土中未检测到甲氧基脂肪酸化合物.该研究显示甲氧基脂肪酸可能来源于某种或数种类型的木本植物.如能排除其与草本植物的关联,甲氧基脂肪酸类化合物很可能是一类具有指示特定木本植物的生物标志化合物,将对精确反演古植被和生态演化很有意义。
Using GC-MS, eight (7- (4-hydroxyethyl) 14) -methoxyhexadecanoic acid and 9 (9-17) -methoxyoctadecanoic acid isomers, of which methoxyoctadecanoic acid has the absolute advantage and that the methoxyl group in the 9th And the tenth carbon position of the isomers are more abundant, with the carbon number of the substituent increases, the abundance of the corresponding isomers decreased in order to broadleaved forest and coniferous forest-based surface of Mount Gongga Among the samples, methoxyl fatty acid compounds are widely present and can be detected in all six types of leaves. In the western Kunlun Mountains, where mountain deserts and alpine deserts are mainly distributed, in addition to the narrower heights of mountain forest or semi-shrub deserts , Most of the topsoil does not detect methoxy fatty acid compounds.This study shows that methoxy fatty acids may be derived from one or several types of woody plants.If you can rule out its association with herbs, methoxy Fatty acid compounds are likely to be a class of biomarkers with specific woody plants that will be accurate for inversion Ecological and evolutionary sense.