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东北地区五大连池湖相沉积物正构烷烃和单体碳同位素特征及其古植被意义

, PP. 890-900

Keywords: 湖相沉积物,正构烷烃,单体碳同位素,古植被意义,五大连池,东北地区

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Abstract:

对中国东北地区小兴安岭与松嫩平原过渡带五大连池青石钻孔湖相沉积物进行了有机地球化学分析,检测出丰富的正构烷烃生物标志化合物。本文主要讨论了正构烷烃的分布及其单体碳同位素组成特征。正构烷烃具有前峰型和双峰型两种分布特征,表明其有机质为混合来源,包括低等菌藻类生物和陆生高等植物输入。正构烷烃的分布特征表明,自35.2kaB.P.以来,nC27/nC31和ACL指标共同记录了东北地区小兴安岭与松嫩平原过渡带的植被以草本为主。对C27、C29和C31长链正构烷烃进行了单体碳同位素测定,并利用二元模式估算了C3和C4植物相对生物量,结果表明,自35.2kaB.P.以来,研究区的植被以C3植物为主。期间在典型冷暖气候事件中,受温度变化的影响,C3/C4植物的相对生物量有明显的变化,在全新世大暖期(6.0kaB.P.),受温度升高影响,C3植物的生物量显著减少,C4植物的生物量则明显增加;而在两次典型冷气候事件(中全新世降温事件8.2kaB.P.和新仙女木事件12.9kaB.P.)时期,受温度降低影响,C3植物的生物量有增加的趋势,C4植物的生物量则相对呈减少的趋势;在末次冰盛期21.0kaB.P.时,受明显低温特征的影响,C3植物生物量高达80.0%,这可能是当时低温的气候特征抑制了C4植物的生长。研究结果对探索我国东北地区C3/C4植物分布格局,并为评估未来气候演化对该地区植被格局和农业生产的影响提供科学依据。

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