摘要
根据对陕西歧山县五里铺村全新世黄土剖面的野外考察和粒度、磁化率室内分析 ,揭示了该地区全新世气候变化规律。认为在全新世大暖期当中的 6 0 0 0 5 0 0 0aB .P .曾经出现过风成黄土的堆积 ,代表了一个相对干旱期。因而 ,可知全新世大暖期气候是不稳定的。这就导致全新世出现两个成壤期。不论在温湿阶段还是在冷干阶段 ,气候都具有短尺度。
The field investigations, grain-size analysis and magnetic susceptibility measurement in the Holocene loess profiles in Qishan, Shaanxi, has revealed the characteristics of the climatic change during last 11000 years. There is an arid phase existed in the middle of the Holocene Megathermal between 6 000~5 000 a B.P.. It is represented by a layer of loess (L\-x) in the profile. Therefore, there are two pedogenic periods in the Holocene, which is represented by palaeosol S\+2 0 and S\+1 0 in the profile. In addition, smaller-scale climatic variation was very frequent over the last 11 000 years.
出处
《中国沙漠》
CSCD
北大核心
2000年第4期415-417,共3页
Journal of Desert Research
基金
陕西省自然科学基金95D05项目
中国科学院黄土与第四纪开放实验室基金项目成果
关键词
全新世
气候变化
高分辨率
陕西
Holocene
climatic change
high resolution
Shaanxi
