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地理科学  2014 

福建仙山泥炭距今1400a以来的α-纤维素δ13C记录及其气候意义

, PP. 1018-1023

Keywords: 泥炭,碳同位素,降水,太阳活动

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Abstract:

基于对福建屏南仙山泥炭沉积物中物理化学性质十分稳定的α-纤维素的提取及其碳同位素分析,重建了研究区距今1400a以来的气候演化历史。研究结果显示仙山泥炭钻孔中α-纤维素δ13C值的变化范围为-26.6‰~-11.3‰,其大幅度的波动特征主要与区域降水控制的盆地沉积环境变化有关,当降水偏多时盆地积水形成类似湖泊的水下沉积环境,沉积物中有机质主要来源于δ13C值偏重的沉水植物;反之则以δ13C值偏轻的沼泽植物为主。依据AMS1414C测年的结果,距今1400a以来研究区经历了气候偏湿(AD600~910年)-偏干(AD910~1640年)-偏湿(AD1640年至今)3个变化阶段。在数十年至百年时间尺度上,纤维素δ13C记录中出现的降水减少时期与太阳活动极小期(中世纪极小期、欧特极小期、沃夫极小期、史波勒极小期、蒙德极小期和道尔顿极小期)一一对应,两者呈现正相关关系,揭示太阳活动的减弱是控制研究区降水减少的主要因素,为预测区域降水变化趋势提供了依据。

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