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青海湖是我国最大的内陆咸水湖泊.对这种湖泊沉积物中正构烷烃及其氢同位素进行了分析,研究了沉积物中正构烷烃及其同位素组成,并且与青海湖水生植物及其周围陆生植物的研究结果进行了对比,研究了它们的成因.结果显示了青海湖表层和柱状沉积物中正构烷烃分布都是类似的,其特征反映了它们起源于湖泊周围陆生草本植物.青海湖表层沉积物中正构烷烃氢同位素组成特征也与柱状沉积物中的类似,沉积物样品中正构烷烃氢同位素的组成和分布特征反映了它们主要来自陆生草本植物.从而进一步证实了水体中沉积物的正构烷烃氢同位素组成,反映了生物源的氢同位素组成,后者与古气候相关,因此沉积物的正构烷烃氢同位素组成可以指示古气候.
Qinghai Lake is the largest inland lagoon in China.The n-alkanes and their hydrogen isotopes in sediments of this lake are analyzed, the n-alkanes and their isotopic compositions in the sediments are studied, and their relationships with the aquatic plants in and around Qinghai Lake The results of terrestrial plants were compared to study their genesis.The results show that the distribution of n-alkanes in the surface layer and columnar sediment of Qinghai Lake are similar, and their characteristics reflect that they originated from terrestrial herbaceous plants around the lake.Qinghai The composition of hydrogen isotopes of n-alkanes in lake sediments is also similar to that of columnar sediments, and the composition and distribution of n-alkanes hydrogen isotopes in sediment samples reflect that they mainly come from terrestrial herbs, which further confirms the sedimentation The isotopic composition of n-alkanes, reflecting the biogenic hydrogen isotope composition, which is related to the paleoclimate, so the n-alkane hydrocarbon isotopic compositions of sediments can indicate paleoclimate.