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基于3种不同类型的炭屑数据定量重建大兴安岭火历史的结果对比

, PP. 960-966

Keywords: 炭屑,CharAnalysis,大兴安岭,火历史

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Abstract:

如何根据沉积物中的炭屑记录准确重建火历史是当前古火研究的热点。在古火研究中,大于125μm的大炭屑和小于125μm的微炭屑是最常用的炭屑数据。本文根据大兴安岭以北的漠河县图强泥炭剖面(TQ)的微炭屑面积浓度(AC)、微炭屑颗粒浓度(MiN)和大炭屑颗粒浓度(MaN)这3种不同类型的炭屑数据并利用目前国际上使用比较广泛的CharAnalysis模型定量重建了该地区的火历史。研究结果表明,同一沉积剖面不同类型的炭屑数据所重建的火历史总体规律基本一致,均表现出在距今1690年以来着火次数为12~14次;火事件间隔期变化均较为平缓,单次火事件的平均间隔期为81~124年;火事件发生频率经历了先上升后下降再上升的变化趋势,平均频率为3.5~4.1次/500年。但3种不同类型的炭屑数据重建火事件的次数、频率和间隔期之间仍有一些差异。这种差异可能是由于炭屑破碎程度不同所致。

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