| 福建漳浦前湖湾晚更新世的孢粉组合及其古环境意义 |
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| 引用本文： | 吴彩容,刘剑秋,王绍鸿,俞鸣同.福建漳浦前湖湾晚更新世的孢粉组合及其古环境意义[J].福建地理,2008(1):1-7. |
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| 作者姓名： | 吴彩容 刘剑秋 王绍鸿 俞鸣同 |
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| 作者单位： | 福建师范大学生命科学学院 福州350007(吴彩容，刘剑秋)，福建师范大学地理科学学院 福州350007(王绍鸿，俞鸣同) |
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| 基金项目： | 国家自然科学基金(40476051)，福建省自然科学基金(2006J0129)资助项目 |
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| 摘 要： | 从孢粉角度对漳浦前湖湾古森林遗迹分布区所在的剖面QHP和钻孔QHZ～1的第四纪沉积物进行系统的分析．经过孢粉种属鉴定、孢粉浓度的统计，木本、草本、蕨类、藻类以及各科属孢粉百分比的不同，划分出7个孢粉组合带，剖面QHP自下而上为组合带Ⅲ、Ⅱ、Ⅰ，其中组合带Ⅲ推知属晚更新世的中期产物，组合带Ⅱ属晚更新世中期接近晚期的产物，组合带Ⅰ属晚更新世晚期的产物；钻孔QHZ-1自下而上为组合带Ⅳ、Ⅲ、Ⅱ、Ⅰ，其中组合带Ⅳ推知属晚更新世的早期的产物，组合带Ⅲ是一过渡层，组合带Ⅱ推知属晚更新世的中期的产物，组合带Ⅰ推知属晚更新世晚期的产物，而组合带Ⅰ以上的层位是全新世以来的产物．结合^14C测年和沉积地层岩性等资料，得出该地区晚更新世以来沉积环境及其古气候演化的4次变迁过程：晚更新世早期的寒冷干燥；晚更新世中期的温和热湿，期间发生2次明显的海侵事件；晚更新世晚期过渡到全新世的冷暖干湿的动荡期；全新世以来与现代气候较为接近的气候．
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| 关 键 词： | 前湖湾 晚更新世 孢粉分析 古环境 |
The Sporopollen Assemblages and Their Paleoenvironment Significance of the Qianhu Bay,Zhangpu,Fujian since Late Pleistocene |
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| WU Cai-ronga,LIU Jian-qiua,WANG Shao-hongb,YU Ming-tongb.The Sporopollen Assemblages and Their Paleoenvironment Significance of the Qianhu Bay,Zhangpu,Fujian since Late Pleistocene[J].Fujian Geography,2008(1):1-7. |
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| Authors: | WU Cai-ronga LIU Jian-qiua WANG Shao-hongb YU Ming-tongb |
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| Institution: | WU Cai-rong, LIU Jian-qiu, WANG Shao-hong, YU Ming-tong (1. College of Life Sciences, 2. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China) |
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| Abstract: | A systematic pollen and sedimentological analysis of the Quaternary sediments from the QHP section and QHZ-1 core found within the distribution area of former tree stumps in the Qianhu Bay, Zhangpu County, was conducted. Seven pollen assemblage zones were defined based on the statistics of pollen species identification and pollen concentration data and changes in pollen percentages for woody, herbaceous, fern, spore, and individual species. Starting from the bottom, the QHP section can be divided into three pollen assemblage zones： Ⅲ , Ⅱ , and Ⅰ. Zone Ⅲ was suggested to be the sediments of middle late Pleistocene, Zone Ⅱ the sediments of middle and close to the upper late Pleistocene, and Zone Ⅰ the sediments of the upper late Pleistocene. Also starting from the bottom, the QHZ-1 core was divided into Ⅳ, Ⅲ, Ⅱ, and Ⅰ pollen assemblage zones. Among them, Zone Ⅳ belongs to the lower late Pleistocene, Zone Ⅲ is a transition layer, Zone Ⅱ belongs to the middle late Pleistocene, Zone Ⅰ belongs to the upper late Pleistocene, and the layer over Zone Ⅰ belongs to the Holocene period. Based on the ^14C dates and sedimentary characteristics, it was suggested that the area has experienced 4 major episodes of change in terms of depositional environment and paleoclimate changes since late Pleistocene. The early part of the late Pleistocene was charac- terized as dry and cold. The middle part of the late Pleistocene became mild and moist, with two well documented seawater transgression events. The upper part of the Late Pleistocene is a transitional period to the Holocene and characterized by alternating cold/dry and mild/moist cycles. The climate of Holocene period was similar to that of modern time. |
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| Keywords: | Qianhu bay Late Pleistocene sporopollen analyses Paleoenvironment |
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