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开展了自长白山至贝加尔湖空间跨度约2000 km断面上代表性地点的水生植物正构烷烃及其单体氢同位素研究.结果表明,该区域大型水生植物正构烷烃具有明显的奇偶优势,以C23或C25为主峰,这两个链长的正构烷烃可以作为研究区水生植物来源的普适性特征标志物.同一植物来源的不同链长正构烷烃的单体氢同位素值相近,尤其是n-C21,n-C23,n-C25三者的氢同位素值相差很小.水生植物正构烷烃与环境水间的氢同位素分馏值稳定在?159‰左右,与欧洲等地区获得的结果有很好的一致性,表明正构烷烃单体氢同位素可以示踪水体的氢同位素组成.全球水生植物正构烷烃氢同位素数据综合分析显示,正构烷烃C23和C25氢同位素平均值是反演环境水体氢同位素组成的优选代用指标.本研究不仅获得了这一区域水生植物的分子标志物数据,同时对全面认识和理解正构烷烃氢同位素组成及其在古气候研究中的应用具有重要意义.
The study on n-alkanes and their monomeric hydrogen isotopes of aquatic macrophytes from the Changbaishan-Baikal Lake with a spatial span of about 2000 km showed that the n-alkanes in the macrophytes in this area have obvious odd-even advantages. The C23 Or C25 as the main peak.The n-alkanes with these two chain lengths can be used as universal markers of aquatic plant origin in the study area.The monomer hydrogen isotopes of n-alkanes with different chain lengths from the same plant are similar, especially n C21, n-C23, n-C25 hydrogen isotope values difference is very small.Hydrocarbon plant n-alkanes and ambient water hydrogen isotope fractionation stable at about 159 ‰, and the results obtained in Europe and other regions are very Good consistency, indicating that n-alkanes monomer hydrogen isotopes can trace the hydrogen isotope composition of water global aquatic n-alkanes hydrogen isotope data analysis shows that n-alkanes C23 and C25 hydrogen isotopes of the average environmental inversion Hydrogen isotope composition of the preferred proxy index.This study not only obtained the molecular markers of aquatic plants in the region data, at the same time to fully understand and understand the n-alkane hydrogen isotope composition Its application in paleoclimate research has important significance.