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摇蚊亚化石记录的苏干湖近千年来盐度变化研究

, PP. 338-344

Keywords: 苏干湖,摇蚊亚化石,盐度,小冰期

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Abstract:

利用摇蚊亚化石重建湖泊古盐度进而分析区域干湿变化已成为国际上古气候重建研究的热点之一。本文利用苏干湖SG03I孔的摇蚊亚化石组合变化分析了湖泊水体近千年来的盐度波动过程,沉积序列可划分为3个摇蚊组合带,通过高咸水属种Orthocladius/Cricotopus和Psectrocladiusbarbimanus,以及低咸水属种Psectrocladiussordidellus和Procladius的相对丰度变化实现盐度重建。结果表明,990~1450A.D.期间高咸水种处于绝对优势,湖泊盐度较高;1450~1850A.D.期间低咸水种显著增加,指示了小冰期期间较高的入湖水量与蒸发量之比;1850~2002A.D.期间低咸水种丰度回落,湖泊水体盐度逐渐增加至现代水平。SG03I孔岩芯摇蚊指标与其他代用指标的结果有很好的对应关系,摇蚊亚化石组合变化揭示的苏干湖区小冰期相对湿润的气候状况在干旱区其他记录中也有反映,证实了摇蚊亚化石分析在西北干旱区古环境研究中的有效性。

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