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科学通报  2011 

150年来若尔盖泥炭沉积支链四醚膜类脂及古环境重建

, PP. 1741-1748

Keywords: 泥炭,若尔盖草原,古气候,GDGTs

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Abstract:

环化指数(CBT)/甲基化指数(MBT)是近年来根据支链四醚膜类脂(GDGTs)提出的定量化重建土壤pH和陆地年平均大气温度(MAAT)的生物标志物指标.本文通过对高寒若尔盖草原泥炭柱状样中GDGTs含量的测定,利用CBT/MBT指标定量化重建了其近150年来的泥炭pH和MAAT的变化.近150年来四川若尔盖草原泥炭pH和MAAT大致经历了3个变化阶段1851~1927年pH基本没有变化,MAAT缓慢降低1℃;1927~1979年pH快速降低0.6,MAAT大幅降低2.5℃;自1979年以来pH和MAAT大幅升高0.8和5℃.计算温度与当地气象站记录的近45年来年平均温度具有相似的升温趋势和平均值,并且近150年来计算的MAAT和在该地区利用树木年轮计算的温度具有相似的变化趋势,表明泥炭沉积中GDGTs相关指标在高分辨重建陆地古环境的适用性和应用潜力.

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