西安神禾塬全新世黄土磁化率反映的古气候特征  

Palaeoclimate character of susceptibility of loess during the Holocene in Xi′an Shenheyuan

作　　者：李秉成[1] 

机构地区：[1]长安大学环境科学与工程学院

出　　处：《西北大学学报（自然科学版）》2007年第5期798-802,共5页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(49971096)

摘　　要：目的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。方法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,建立该地区全新世以来黄土沉积年代序列。结果根据磁化率气候替代指标显示的曲线特征,得出了这一替代指标在剖面上的变化规律以及该黄土剖面所反映的东亚冬、夏季风强弱变化特点,将西安地区10 000年以来的气候演变划分为7个气候阶段。结论全新世以来,西安地区气候变化表现为周期性、不稳定性和趋势性。Aim To study the characteristic of the evolution of environment in Xi＇an area during the Holocene, providing a basis for Xi＇an, China and the whole world to predict future environment development trends. Methods Establishing loess deposition age sequence during the Holocene in the region by the description of rock character of loess-palaeosol stratum, the partition and contrast of stratum of section in Yu Baotou village of Xi＇an Shen Heyuan, and with the combination of age measuring of AMS^14C in Xinzhuang village of Jingyang county and other scholars＇testing data. Results According to the character of the curve expressed by substitution indication of climate of susceptibility, the changing regularity of this substitution indication in the section was obtained. At the same time, the strength changing character of winter and summer monsoon in East Asian reflected by the loess section was shown. The palaeoclimate evolution can compartimentalize 7 climate stage nearly 10000 years in Xi＇an area. Conclusion During Holocene,the evolution of climate in Xi＇an area is reflected by the cycle,instability and trends of it.

关 键 词：西安神禾塬 全新世 磁化率 古气候特征 

分 类 号：P462[天文地球—大气科学及气象学]