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位于青藏高原念青唐古拉山南缘羊八井盆地的七弄沟分布着广阔的泥炭地,通过提取七弄沟泥炭的腐殖化度和总有机碳信息,并结合14 C测年控制,反演了全新世9.1~3.5cal.kaBP羊八井盆地的环境变化信息。根据泥炭记录的古环境特征,将该地区9.1~3.5cal.kaBP的气候分为3个主要阶段:阶段Ι(9.1~7.4cal.kaBP)温度波动上升阶段,9.1~7.4cal.kaBP七弄沟温度呈波动上升趋势,期间发生了两次比较明显的降温事件,分别发生在9.1和8.0cal.kaBP左右;阶段Ⅱ(7.4~4.7cal.kaBP)温度波动频繁且剧烈阶段,此阶段七弄沟温度波动频繁且剧烈,在6.0和5.8cal.kaBP发生了两次比较显著的降温事件;阶段Ⅲ(4.7~3.5cal.kaBP)温度波动下降阶段,4.7cal.kaBP之后温度呈波动下降的趋势,但是波动的频率和幅度远比第二阶段小,仅在4.0cal.kaBP发生了比较显著的降温事件。
The vast peatlands in Qiaogougou located in the Yangbajing well on the southern margin of the Nyainqentanglhara in Qinghai-Tibet Plateau are characterized by the extraction of humification and total organic carbon of the peat in Qi’onggou, combined with 14 C dating control and inversion Holocene 9.1 ~ 3.5cal.kaBP Yangbajing basin environmental change information. According to the paleoenvironmental characteristics of peat records, the climate of 9.1 ~ 3.5cal.kaBP in the area is divided into three main stages: phase I (9.1 ~ 7.4cal.kaBP), temperature fluctuation rising stage, 9.1 ~ 7.4cal.kaBP The temperature fluctuated upward trend, during which two obvious cooling events occurred, which occurred at 9.1 and 8.0cal.kaBP, respectively. The temperature fluctuated frequently and violently in stage Ⅱ (7.4 ~ 4.7cal.kaBP) The temperature fluctuated frequently and drastically, and two significant cooling events occurred at 6.0 and 5.8 cal.kaBP. The temperature fluctuated downward after 4.7 cal.kaBP in stage Ⅲ (4.7-3.5 cal.kaBP) However, the frequency and amplitude of the fluctuations are much smaller than those of the second phase, with significant cooling events occurring only at 4.0 cal.kaBP.