收稿日期: 2009-01-12
修回日期: 2009-05-29
网络出版日期: 2009-08-10
Application of Plant-derived n-Alkanes and Their Compound-specific Hydrogen Isotopic Composition in Paleoenvironment Research
Received date: 2009-01-12
Revised date: 2009-05-29
Online published: 2009-08-10
正构烷烃是植物类脂的重要组成部分，主要用来维持叶片表面的水分平衡，其平均碳链长度（ACL）作为植物对水分胁迫程度的生理性反映，与植物进化程度存在表观上的联系。高等植物来源烷烃的ACL高于低等植物和水生藻类，裸子植物高于被子植物，C4植物高于C3植物，因此植物正构烷烃具备粗略的植物分类学意义，并在古环境研究中被广泛应用。在河口和海洋沉积物中主要用来判断水生低等植物和陆地高等植物的相对贡献，在古土壤中则用来区分草本/木本植物的消长变化。植物烷烃中的氢元素主要来自光合作用时吸收的环境水，其δD主要受环境条件和生物化学过程影响，但环境条件、气候状况和植被类型的影响可以在很大程度上相互抵消，使烷烃δD具有记录大气降水δD的潜力，从而可以用来重建大气降水δD并反演气候变化。
关键词： 植物正构烷烃; 平均碳链长度; 单体氢同位素组成δD; 古环境
张杰 , 贾国东 . 植物正构烷烃及其单体氢同位素在古环境研究中的应用[J]. 地球科学进展, 2009 , 24(8) : 874 -881 . DOI: 10.11867/j.issn.1001-8166.2009.08.0874
n-Alkanes are an important part of epicuticular leaf lipids, which are principally used to keep water balance of plant leaf surface. Their average carbon chain length (ACL), as the physiological response of plants to environmental water stress, is proposed to be related to the evolution of plants. The ACL of higher plant-derived n-alkanes is longer than that of lower plants and aquatic algae, so are those of gymnosperm than angiosperm and C4 than C3 plants, suggesting the implications of n-alkanes for rough classification of plants. Therefore, the ACL of n-alkanes has been applied intensively in paleoenvironment research to investigate the relative contributions of aquatic vs. land plants in sediments and of herbaceous vs. woody plants in paleosols. Hydrogen of higher plant-derived n-alkanes is initially taken from water during photosynthesis and its isotopic composition is mainly affected by environmental conditions and biochemical processes. However, the influences from environmental change have been found to be largely compensated by those from the concurrent vegetation shift, making higher plant-derived n-alkane δD have the potential to record meteoric water δD, and hence useful for paleogydrology studies.
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