高喜马拉雅盆地晚中新世以来古植被对干旱事件的生态响应

The late Cenozoic climatic aridification is one of the most profound and general scientific problems affected human living environment,its forming reasons and developing processes are hot questions.Because of uplift of the Tibetan Plateau and its mountain building in Cenozoic,formed some significant residual basins. Some Cenozoic sedments were deposited in the residual basins, and the sediments recorded abundant Tibetan Plateau evolution information.So these basins are closely related to the uplift of Tibetan Plateau, they are important materials to investigate the relationship between paleoclimatic changes and the uplift of the Tibetan Plateau. Also,these sediments preserved abundant organic matters,including plenty of geomicrobial lipids which originated from bacteria and archaea. By the investigation of modern process to Tibetan Plateau salty and alkality soil and the analysis of microbial lipids and long chain n-alkanes' specific isotopes(δ13C and δD) from late Miocene sediments of Zhada and Gyirong basins in high Himalayas, explore the indication of microbial lipids to climate aridity events.On the basis of these records,we can explore the climatic aridity events and paleo-vegetation features from high Himalayan basins since late Miocene,and ecological responses of paleo-vegetation to these aridity events.

晚新生代的气候干旱化问题成为影响人类生存环境最为深刻和广泛的重大科学问题之一，对其发生的原因以及发展的过程受到广泛关注。而青藏高原在新生代的隆升成山作用形成的残留盆地中堆积了大量新生代沉积物，这些沉积物中蕴涵了大量有关青藏高原演化的信息，因此与青藏高原隆升密切联系的这些盆地，成为当前研究古气候变化与高原隆升联系的重要载体。这些沉积物中保存了丰富的有机质，包含了大量来源于细菌和古菌的地质微生物。通过对青藏高原盐碱化土壤现代过程以及高喜马拉雅带札达和吉隆盆地晚中新世沉积物中微生物脂类及正构烷烃单体同位素的研究，综合探索微生物脂类对干旱事件的指示意义，揭示高喜马拉雅带盆地晚中新世以来干旱事件的记录和古植被面貌变化，进一步反映古植被对干旱事件的生态响应。