中文摘要：

通过对青海湖沉积物单一种属介形虫壳体Li/Ca比值和氧同位素的研究,恢复了青海湖地区近千年来温度和降雨量的变化历史。Li/Ca比值和氧同位素的强烈相关性（r=0.5,n=59,p〈0.01）表明青海湖地区近千年来温度和降雨量的同步变化。对气象数据及德令哈和都兰树轮指数恢复的气候参数的研究发现,这种同步变化也是存在,认为这种变化是东亚夏季风的固有特点,何种因素导致这种相关性变化,在未来的研究中值得进一步关注。

英文摘要：

Based on the oxygen isotopic values and Li/Ca ratios from ostracod shells of the species of Eucypris inflate in Lake Qinghai,temperature and precipitation variations during the past millennium in this catchment were reconstructed.The good correlation（r=0.5,n=59,p0.01） between Li/Ca ratios and δ18O values of ostracod shells indicates that temperature changes corresponded well with precipitation variations during the past millennium.Synchronous variations of temperature and precipitation are also observed in the local meterological records and the climatic parameters inferred from Delingha and Dulan tree ring widths.We believe that the synchronous variation as such is a sole feature of East Asian summer monsoon,although the factors controlling this featue deserve further study.