| 植硅体记录的敦化北部山地近2 ka泥炭沼泽演化气候背景 |
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| 引用本文： | 杜玉,张新荣,平帅飞,焦洁钰,马春梅.植硅体记录的敦化北部山地近2 ka泥炭沼泽演化气候背景[J].吉林大学学报(地球科学版),2020,50(1):170-184. |
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| 作者姓名： | 杜玉 张新荣 平帅飞 焦洁钰 马春梅 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春 130061;2. 吉林大学东北亚生物演化与环境教育部重点实验室, 长春 130026;3. 吉林省油页岩与共生能源矿产重点实验室, 长春 130061;4. 南京大学地理与海洋科学学院, 南京 210023 |
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| 基金项目： | 国家自然科学基金项目（41371202） |
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| 摘 要： | 对敦化北部山地205 cm深泥炭剖面中的植硅体进行提取、鉴定和分析，结合AMS14C测年，重建研究区近2 ka的古气候环境过程，探讨其变化规律及影响因素。植硅体组合、有序聚类和植硅体指数变化趋势显示，研究区泥炭沼泽经历了4个显著阶段：即45-680 A.D.暖湿阶段；680-1340 A.D.温暖偏干阶段；1340-1870 A.D.由干转湿的寒冷阶段；1870-2017 A.D.转暖、干湿波动阶段。其中，680-1225 A.D.对应中世纪暖期（MWP），1340-1870 A.D.对应小冰期（LIA）。在此气候变化背景下，泥炭沼泽发展经历了由缓慢逐渐加快的过程。对比太阳辐射和太阳活动的变化、石笋δ18O序列、重建的东北地区古温度以及Niño3.4重建曲线，泥炭剖面的植硅体分析显示MWP和LIA期间的古气候过程受到太阳活动、太阳辐射、季风环流和ENSO（El Niño-Southern Oscillation）的控制。
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| 关 键 词： | 植硅体 泥炭演化 气候变迁 区域差异 敦化山地 |
| 收稿时间： | 2018-12-20 |
Climate Background of Peat Swamp Evolution Recorded by Phytolith over Past 2 ka in Northern Mountainous Area in Dunhua |
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| Du Yu,Zhang Xinrong,Ping Shuaifei,Jiao Jieyu,Ma Chunmei.Climate Background of Peat Swamp Evolution Recorded by Phytolith over Past 2 ka in Northern Mountainous Area in Dunhua[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(1):170-184. |
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| Authors: | Du Yu Zhang Xinrong Ping Shuaifei Jiao Jieyu Ma Chunmei |
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| Institution: | 1. College of Earth Science, Jilin University, Changchun 130061, China;2. Key-Laboratory for Evolution of Past Life and Environment in Northeast Asia, Ministry of Education, Changchun 130026, China;3. Key Laboratory of Oil Shale and Coexistent Enerny Minerals of Jilin Province, Changchun 130061, China;4. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China |
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| Abstract: | Based on the AMS14C dating and the phytoliths extracted from the 205 cm peat profile in the northern part of Dunhua, the paleoclimate environmental progresses of the study area near 2 ka were reconstructed,and the changing rules and influencing factors were discussed. The phytolith assemblages, ordered cluster analysis, and phytolith indexes showed that the peat swamp in the studied profile had experienced four significant stages:45-680 A. D. warm and wet stage; 680-1340 A. D. warm and dry stage; 1340-1870 A. D. cold and dry to wet stage; 1870-2017 A. D. warm, dry, and wet fluctuation stage. The paleoclimate condition in 680-1225 A. D. was similar to that in the Medieval Warm Period (MWP), and the condition in 1340-1870 A. D. was similar to that in the Little Ice Age (LIA). In such a climate context, the peat swamp developed a slow to gradually accelerated period. Compared with solar irradiation, stalagmite δ18O sequence,Niño3.4, and the paleotemperature reconstruction in Northeast China, the phytolith analysis in the studied peat profile indicated that the paleoclimate process during MWP and LIA was controlled by solar activity, solar irradiation, monsoon circulation, and ENSO (El Niño-Southern Oscillation). |
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| Keywords: | phytolith peat swamp evolution climate changes regional differences moutainous area in Dunhua |
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