黄土高原平凉地区中全新世以来孢粉-植硅体记录对比研究

发布时间：2019-03-15 13:00

【摘要】：对位于甘肃省平凉县大寨村的平凉剖面(0 142 cm)进行年代测试、孢粉及植硅体分析。从孢粉角度反映8.50 Ka BP气候经历了冷干—凉干—偏凉偏湿—凉干—偏凉偏湿—偏凉偏干的变化过程。从植硅体的角度经历了凉湿—暖湿—暖湿(具有变冷的趋势)—凉湿—偏凉偏干的变化过程。选取含量较高且具有典型环境指示意义的四种科属孢粉(云杉属、松属、禾本科、蒿属)与四种类型植硅体(扇型、长方型、棒型、尖型)进行对比,结果表明:孢粉记录的气候与植硅体记录的气候特征总体趋势相同,但存在一定的差异。孢粉含量较为丰富的气候带与植硅体气候带有很好的对应关系,反映的气候类型较为准确;当孢粉带中其他花粉含量很少,仅含有较多传播能力强、不具代表性的花粉(如松属)时,孢粉指示的气候环境准确性较低。而植硅体样品在整个黄土剖面中含量都较高,反应的气候特征较为准确,因而在孢粉含量较少的黄土高原,相较于孢粉而言,植硅体是较为有效的古气候研究手段。
[Abstract]:The pingliang profile (0 / 142 cm) located in Dazhai Village, Pingliang County, Gansu Province, was chronologically tested, sporopollen and phytolith analyzed. From the point of view of sporopollen, the climate of 8.50 Ka BP has experienced the process of cold-dry-cold-wet-cold-dry. From the point of view of silicon plant, the process of cool-wet-warm-wet (with the trend of becoming colder)-cool-wet-cold and dry is experienced. Four species of sporopollen (spruce, pine, gramineae, artemisia) with high content and typical environmental indication were compared with four types of silicones (fan type, rectangular type, rod type, pointed type). The results showed that the climate recorded by sporopollen was the same as that recorded by phytolith, but there were some differences. There is a good correspondence between the climate zone with abundant sporopollen content and the climate of plant silicon body, and the climate type reflected is more accurate. When the content of other pollen in sporopollen zone is very small and contains only a lot of pollens (such as pine genus), the climate and environment accuracy indicated by sporopollen is lower than that of other pollen bands with strong spreading ability and non-representative pollen (such as pine genus). In the loess plateau with less sporopollen content, phytolith is an effective palaeoclimate research method compared with sporopollen in the loess plateau with relatively high content of phytolith in the whole loess section and more accurate climatic characteristics of the reaction in the loess plateau where the sporopollen content is less than that in the loess plateau where the sporopollen content is less.
【作者单位】：中国地质科学院水文地质环境地质研究所;河北地质大学;
【基金】：中国地质科学院基本科研业务费项目(编号:YWF201411;YYWF201627)资助~~
【分类号】：Q914

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