一万年以来西安东郊的植被和气候

Vegetations and climate since 10Ka B.P in eastern suburbs of Xi'an

通过对西安东郊半坡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。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。结果表明中全新世气候温暖湿润;晚全新世温凉干旱。

With a series of geological investigation, intensive samples and a large amount of spore - pollens analysis to Dawei Valley sections from Banpo of eastern suburbs of Xi＇an, the evolution of the vegetations in this region, was explored specifically, the characteristics of the changeable climatic environment during the period Holocene were summerized. A large amount of pollens and spores were found from seventeen samples of the loess section, and a concentration spore - pollens diagrams of the loess strata was drown. The evolution of vegetation during the Holocene and the corresponding climate in time and space in the region was brought to light by an analysis of the variation of spore -pollens assemblages in this section. The results indicated that the climate in the middle Holocene was wanner and wetter, late Holocene was warmer, colder and drier.