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对西安地区全新世以来的环境演变特征进行研究,从而为预测西安地区乃至中国和全球未来环境的发展趋势提供依据。通过对西安神禾塬鱼包头村典型剖面全新世黄土-古土壤地层的岩性描述、地层划分和对比,结合泾阳县新庄村AMS14C的年代测定和其他学者的测年数据,建立了该地区全新世以来黄土沉积年代序列。根据磁化率气候替代指标显示的曲线特征,阐述了这一替代指标在剖面上的变化规律,探讨了该黄土剖面所反映的东亚冬、夏季风强弱变化特点,论证和详细分析了西安地区全新世以来环境变化的特征和规律,进而对该剖面磁化率曲线特征与其他学者的孢粉谱建立的温度曲线对比。对西安地区全新世以来古气候的阶段性进行了详细分析和论证。将西安地区10000年以来的气候演变划分为7个气候阶段。
This paper studies the characteristics of environmental evolution since the Holocene in Xi’an so as to provide a basis for forecasting the future development of the environment in Xi’an and even in the world. Through the lithologic description, stratigraphic division and contrast of the Holocene loess-paleosol stratum in the typical section of Yu Baotou Village in Shenhu Plateau of Xian, combined with the dating of AMS14C of Xinzhuang Village in Jingyang County and the dating data of other scholars, a new Loess sedimentary chronology. According to the curve characteristics of the indicators of magnetic susceptibility and climate change, the changing rules of this alternative index in the section are expounded. The characteristics of the changes of the intensity of East Asian winter and summer monsoon reflected by the loess section are discussed. The new The characteristics and laws of environmental changes since the world were compared with those of other scholars. The stage of paleoclimate since Holocene in Xi’an has been analyzed and demonstrated in detail. The climate change in Xi’an since 10000 years is divided into seven climatic stages.