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内蒙古达里湖全新世有机碳氮同位素记录与环境演变

, PP. 856-870

Keywords: 达里湖,C/N比值,稳定同位素,水文,生态,东亚夏季风边缘区,全新世

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Abstract:

内蒙古中东部的达里湖为一水文封闭型湖泊,位于现今东亚夏季风的北部边缘区,对区域环境变化十分敏感。本文对达里湖沉积中心提取的岩芯(DL04沉积岩芯)顶部8.5m沉积物进行了有机地球化学分析。15个全岩样品有机质的放射性碳测年结果表明:岩芯顶部8.5m涵盖了过去大约11500年。按约50年分辨率分析的225个总有机碳(TOC)、总氮(TN)含量、总有机碳/总氮(C/N)原子比值数据以及221个有机碳和有机氮稳定同位素(δ13C和δ15N)数据,详细揭示了全新世东亚夏季风边缘区的水文和生态变化历史。在距今11500~9800日历年(cal.aB.P.)期间,所有地球化学指标均呈逐渐增大趋势,指示入湖河流逐渐增强,达里湖开始扩张,水生植物生产率逐渐升高;在9800~7700cal.aB.P.期间,TOC和TN含量以及C/N比值维持稳定高值,δ13C和δ15N值较小,指示湖泊维持高湖面状态,陆源输入和浮游植物生产率较高;在7700~5900cal.aB.P.期间,C/N比值和δ15N维持低值,TOC和TN含量呈现更高值,并且波动变化,δ13C值逐渐增大,表明湖面维持高水平,湖水显著变暖,浮游植物生产率显著升高,流域植被大幅度扩张;在5900~4850cal.aB.P.期间,TOC和TN含量,C/N比值以及δ13C值显著减小,δ15N值显著增大,暗示地表径流显著减弱,达里湖湖面显著下降,湖泊生产率快速下降;从4850cal.aB.P.开始,TOC和TN含量以及C/N比值呈逐渐减小趋势,δ13C和δ15N值呈逐渐增大趋势,表明湖面逐渐下降,湖水盐度、碱度升高,湖水可能变冷,湖泊生产率逐渐下降,流域植被收缩。全新世东亚夏季风边缘区水文和生态环境的变化可能直接或间接受北半球夏季太阳辐射量和区域季风降水强度的共同控制。

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