青海湖主要介形类碳、氧同位素分馏及其环境意义研究

在青年基金(批准号：4100301)开展单一种属介形类-胖真星介碳、氧同位素分馏对盐度和温度响应基础上，拟通过培养实验与湖泊现代过程研究相结合的方法，进一步深化多种属介形类碳、氧同位素分馏盐度效应的定量化研究。在此基础上，以青海湖湖区不同类型湖泊为研究对象，通过分析不同湖泊岩心中产出的介形类种属及其碳、氧同位素组成，开展不同湖泊多种属介形类碳、氧同位素组成环境指示意义的对比研究。通过这些研究工作，认识引起不同种属介形类碳、氧同位素分馏差异的原因，定量建立介形类碳、氧同位素组成与环境参数的经验方程，进一步明确介形类碳、氧同位素组成在不同湖泊沉积中的环境指示意义。相关研究成果为利用介形类碳、氧同位素组成进行青藏高原湖泊环境定量-半定量重建提供指标支持和理论依据。

On the basis of studying salinity and temperature effect on carbon/oxygen isotopic fractionation in a single ostracod species (Eucypris mareotica) supported by the National Science Foundation of China (4100301), we plan to carry out more works to quantitatively investigate the salinity effect on the carbon/oxygen isotopic fractionation in different ostracod species by the cultural experiment and the study on modern process of lakes. This project also aims to analysis the changes of ostracod species and the carbon/oxygen isotopes of these ostraocds to carry out the contrastive study on carbon/oxygen isotope of different ostraocds species and their environmental implications for varied lakes in Lake Qinghai area. Through these work, we hope to evaluate the possible reasons for the different carbon/oxygen isotopic fractionation among different ostracod species. Furthermore, the possible empirical formula between carbon/oxygen isotopes of ostracods and environmental parameters may be formed, and we can address the implications and applications of carbon/oxygen isotopes of ostracods as indicators of the lacustrine depositional and environmental conditions. Results of this project would also provide the theoretical basis on the quantitative or semi-quantitative climatic reconstruction of lakes on the Qinghai-Tibetan Plateau using the carbon/oxygen isotopes of ostracods.