| 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 |
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| 引用本文：刘林敬,杨振京,王盼丽,毛欣,姜高磊,王成敏,刘荣访,杨庆华.2017.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[J].地球学报,38(3):393-402. |
| DOI：10.3975/cagsb.2017.03.09 |
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| 基金项目:中国地质科学院基本科研业务费项目(编号: YWF201411; YYWF201627) |
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| 中文摘要: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。 |
| 中文关键词:平凉地区 孢粉 植硅体 |
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| Comparative Study of Pollen and Phytolith Records since the Middle Holocene from Pingliang Region of Loess Plateau |
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| Abstract:The dating and analysis of pollen and phytolith were conducted for the sample taken from the Pingliang profile located in Dazhai Village, Pingliang County, Gansu Province, Northwest China. Four types of pollens (i.e., Picea, Pinus, Gramineae and Artemisia) which showed high content and had the typical environmental indication significance were compared with four types of phytoliths (i.e., Fan-shaped, Rectangle, Rhabdolith and Acicula). The results showed that, although the overall trend of climatic environment indicated by pollen and phytolith records was similar, yet there existed some difference. The climatic zone with higher content of pollen well corresponds to phytolith climate zone, reflecting the accurate climate types. When the content of other pollens was low, and pollens with strong transmission capacity and no-representativeness (e.g., Pinus) existed, the accuracy of climatic environment indicated by the pollen was low. However, the content of phytolith in the whole loess profile was higher, so the climate characteristics reflected was more accurate. In contrast to the |
| keywords:Pingliang region pollen phytolith |
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