ENVIRONMENT CHANGES DURING THE CLOSE OF PLEISTOCENE IN THE TAIBAI BASIN IN THE QINLING MOUNTAIN
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摘要: 本文依据太白盆地拐里村晚更新世晚期沉积物中花粉谱,重建当时主要为含桦树的森林草原或灌丛草原,未见森林。孢粉波动幅度明显,记录了气候的强烈变化。该剖面存在四次孢粉贫乏事件(深度为15.6-15.8m、10.7-10.9m、5.6-5.8m和3.4-3.6m),其特点为木本植物花粉急剧减少,乔本植物花粉几乎为零,草本植物花粉增多。上述孢粉贫乏事件与渭南黄土古风化强度、磁化率以及SPECMAP氧同位素曲线具有较好的可比性,反映气候的冷暖波动基本一致,从而表明该区气候变化与全球气候变化基本同步。Abstract: The environment during the close of Pleistocene is reconstructed from the sporopollen spectrum of the Guali Village section.It was a butula-rich forest-steppe or bushveld steppe.The prominent fluctuation of sporopollen content indicates the intense change of climate.The section contained four poor sporopollen events(at depth 15.6-15.8m,10.7-10.9m,5.6-5.8m and 3.4-3.5m).It is characterized by a sharp decrease of woody plant with little or no tree pollen and a increase of herb pollen content.These... More
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