n-Alkanes hydrogen isotopes in soil from the northern region, Tibetan Plateau: Implications for sources of organic matter [青藏高原北部土壤正构烷烃氢同位素及物源意义]

作者：Li C.-L.; Ma S.-P.^*; Chang F.-X.; He X.-B.; Wang L.-H.

来源：China Environmental Science, 2019, 39(5): 2095-2105.

• Microbial degradation
• N-alkanes
• Northern Tibetan Plateau
• Surface soil
• ΔD values of individual n-alkanes

Origins of n-alkanes in surface soil from permafrost regions in the northern part of the Tibetan Plateau were studied by the distributions of n-alkanes, and the δD values of individual n-alkanes. That the distributions of the n-alkanes showed bimodal and trimodal patterns, suggesting that they were derived from multiple sources. The long-chain n-alkanes were mainly derived from higher terrestrial plants. Those of odd carbon number (C25~C33) were lighter than those with even carbon number, which might be caused by different biosynthetic pathways. Cluster analysis indicated that the medium-chain type I n-alkanes (C21~C24) were mainly derived from higher terrestrial plants, and the medium-chain type II n-alkanes might have originated from microorganisms such as bacteria. The medium-chain n-alkane δD values of samples FHS-10, TG2-10and TG3-10were the lightest, due to both the light δD values of water and bacteria or other microorganisms.

• 单位
  冰冻圈科学国家重点实验室; 中国科学院大学