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选择位于黑河下游地区的灌丛沙丘为研究对象,利用14C测年初步建立风沙沉积的年代序列,分析了风沙沉积物地球化学元素和粒度作为环境代用指标的气候意义,通过综合分析和区域对比,初步探讨该区域近300年来的气候环境变化。结果表明:常量元素的含量除Si O2外其他元素含量偏低。灌丛沙丘沉积至少记录了3次相对干旱期和3次相对湿润期。其中,1823年前、1905~1929年、1958~1973年期间,处于相对干旱期;而1824~1904年、1930~1957年、1974年至今,处于相对湿润期。黑河下游灌丛沙丘的气候变化对周边及全球气候变化有较好的响应,是研究近代气候变化的理想场所。
The selected climatic dune sand dunes located in the lower reaches of the Heihe River are used to study the climatic significance of the sediment geochemical elements and grain size as the environmental proxy index by using the 14C dating method to establish the aeolian sediment chronology. Through comprehensive analysis and regional comparison, Preliminary study of the region nearly 300 years of climate change. The results show that the contents of other elements except Si O2 are lower. At least 3 relative dry periods and 3 relative wetting periods were recorded for the shrub dune deposition. Among them, 1823, 1905 ~ 1929, 1958 ~ 1973 period, in a relatively dry period; and 1824 ~ 1904, 1930 ~ 1957, 1974 to date, in a relatively wet period. The climate change of the shrub dune in the lower reaches of the Heihe River has a good response to the surrounding and global climate change and is an ideal place for studying the modern climate change.