西安半坡遗址全新世古气候环境的探讨  

Discussion on Holocene palaeoclimate environment in the ruins of Banpo in Xi′an

作　　者：李秉成[1] 

机构地区：[1]西北大学地质学系,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2004年第4期485-488,共4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　讨论最近10000年来的植被和环境,制定治理黄土高原及其水土流失的战略方针,预测未来黄土高原的气候变化。方法　通过对西安半坡遗址大围沟剖面的地质调查、密集采样和孢粉分析,讨论该区植被的演替。结果　论证了全新世古气候环境的特征,总结了早、中、晚全新世在该区发育的植被及其所代表的气候环境。从该剖面17个样品中分析出了大量孢粉,做出了黄土地层的孢粉图式。据该剖面上孢粉组合变化的分析,得出了全新世的植被与相应的气候在时间上的演变与空间上的分布范围。结论　中全新世气候温暖湿润;晚全新世温凉干旱。Aim It is meaningful to institute a scheme of governing loess plateau as well as its loss of water and earth by knowing the vegetations and environments in recent 10 000 years and so,it can even predict the future climatic changes in the area of loess plateau.Methods With a series of geological investigation, intensive samples chosen and a large amount of spore-pollens analysis to Da Wei Valley sections chosen from the ruins of Banpo Xi′an, It explores specifically the evolution of the vegetations in this region.Results It proves the characteristics of the changeable climatic environment during the period Holocene, finally, it draws the conclusion of the vegetations grown at a time in this region and the climatic environments it represented during the ancient three stages of Early Holocene, Middle Holocene and Late Holocene. It has worked out quite a few pollens and spores from seventeen samples of the loess section, and plotted a concentration spore-pollens diagrams of the loess strata. The evolution of vegetation during the Holocene and the corresponding climate in time and space in the region has been brought to light by an analysis of the variation of spore-pollens assemblages in this section.Conclusion The results indicate that the climate in the middle Holocene was warmer and wetter, late Holocene was warmer, colder and drier.

关 键 词：西安半坡遗址 全新世 古气候环境 

分 类 号：P642[天文地球—工程地质学]