吉林东部陆生植物对早白垩世大洋缺氧事件的响应

项目名称： 吉林东部陆生植物对早白垩世大洋缺氧事件的响应

项目编号： No.31270277

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 生物科学

项目作者： 孙跃武

作者单位： 吉林大学

项目金额： 90万元

中文摘要： 充分利用吉林东部延吉盆地晚中生代火山-沉积建造中的火山岩同位素测年资料，结合多门类古生物年代学资料，补充完善延吉盆地早白垩世年代地层格架。在此基础上，通过对植物（含孢粉和藻类）化石的深入研究查明延吉盆地早白垩世的植物古生态和古气候特征，重点通过植物化石的表皮构造研究来定量或半定量地重建早白垩世温室气候条件下的古大气二氧化碳浓度变化规律；通过对角质层、干酪根等的碳氧同位素分析，建立延吉盆地早白垩世有机碳碳同位素漂移曲线，探讨陆生植物与大气之间的相互作用。最终识别早白垩世海洋-大气-陆生植物系统在大洋缺氧事件（OAE1）中的响应，特别是陆生植物在这一系统中的重要作用，探讨地史时期气候变化中的多因素耦合作用机制，为应对当今全球变暖提供地质历史借鉴。

中文关键词： 早白垩世；大洋缺氧事件；大气二氧化碳浓度；陆地生态系统；耦合机制

英文摘要： Based on the isotopic dating of volcanic rocks in the late Mesozoic volcanic sedimentary formation and on the diverse palaeontological chronologic data, the Early Cretaceous chronostratigraphic framework in the Yanji basin in eastern Jilin will be completed. Furthermore, the paleoecological and paleoclimatic characteristics will be invsetigated thoroughly by systematic study on the fossil plants including pollen, spores and algae. The paleo-atmospheric carbone dioxide (CO2) change will be particularly reconstructed quantitatively by research on the cuticular characters of the fossil plants during the Early Cretaceous "greenhouse" time. The Early Cretaceous organic carbone isotopic excursion curve will be drawn for the Yanji basin through carbon and oxygen isotopic analysis of fossil cuticles, kerogen, bivalve shells and conchostracan shells; and this will makeup our knowledge on the reaction between terrestrial plants and atmosphere in the Early Cretaceous carbone cycle. Finally, the response of Early Cretaceous oceanic anoxic events (OAE1) on the whole system including ocean, atmosphare and terrestrial plants will be recongnized, and especially the most important role the terrestrial plants played. This will be a key to reveal the multi-factor coupling mechanism of climatic changes in the earth history and to p

英文关键词： Early Cretaceous；Oceanic Anoxic Events；Atmospharic carbon dioxide concentration；terrestrial ecosystem；coupling mechanism