| 海南岛双池玛珥湖沉积中的碳、氮地球化学记录及其环境意义 |
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| 引用本文： | 白雁,刘春莲,郑卓,王建华,杨小强,王斌.海南岛双池玛珥湖沉积中的碳、氮地球化学记录及其环境意义[J].古地理学报,2003,5(1):87-93. |
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| 作者姓名： | 白雁 刘春莲 郑卓 王建华 杨小强 王斌 |
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| 作者单位： | 中山大学地球科学系，广州 510275 |
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| 基金项目： | 国家自然科学基金 (4 0 2 72 0 11,4 0 0 710 84 )，广东省自然科学基金 (0 0 12 0 3)资助项目 |
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| 摘 要： | 根据岩芯的碳、氮含量及其比值分析并结合其他气候替代指标的分析结果，恢复了海南岛双池玛珥湖末次冰消期以来的古气候变化。全新世大暖期始于7,400a BP，结束于2,700a BP左右，期间热带地区气候湿热，植物茂盛，双池玛珥湖主要处于沼泽化阶段，蒸发量与降雨量持平。但大暖期中仍存在气候的快速波动事件，约7,200a BP和7,000a BP前后、6,000～5,900a BP、4,300～4,000a BP 期间气候转凉，有机质生产力降低。大暖期前后，分别有明显的凉温但季节性暴雨频繁的气候（8,000～7,400a BP、2,700～2,300a BP），表示气候模式发生变化，降雨量相对大于蒸发量。此时双池玛珥湖处于深水期，由于气温降低以及湖水上升引起的湖边陡壁植被覆盖面积减少，植物生产力降低，导致了岩芯中有机质的低含量。
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| 关 键 词： | 热带古气候 玛珥湖 海南岛 有机碳 碳氮化值 蒸发量 降雨量 |
| 文章编号： | 1671-1505(2003)01-0087-07 |
| 修稿时间： | 2002年7月19日 |
CARBON AND NITROGEN ELEMENTS GEOCHEMICAL RECORDS AND PALAEOCLIMATE CHANGES OF SHUANGCHI MAAR LAKE IN HAINAN ISLAND |
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| Bai Yan Liu Chunlian Zheng Zhuo Wang Jianhua Yang Xiaoqiang Wang Bin,Earth Science.CARBON AND NITROGEN ELEMENTS GEOCHEMICAL RECORDS AND PALAEOCLIMATE CHANGES OF SHUANGCHI MAAR LAKE IN HAINAN ISLAND[J].Journal of Palaeogeography,2003,5(1):87-93. |
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| Authors: | Bai Yan Liu Chunlian Zheng Zhuo Wang Jianhua Yang Xiaoqiang Wang Bin Earth Science |
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| Institution: | Department of the Earth Science Sun Yat-sen（Zhongshan）University, Guangzhou 510275, China |
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| Abstract: | The high-resolution analysis of the content of total organic carbon (TOC), total nitrogen (N) and TOC/N ratio, together with other climate proxy analysis from core SC-1 in Shuangchi Maar Lake in Hainan Island has been made to reconstruct the tropical climate changes since the Last Deglacial period. The Holocene Megathermal began at 7 400 a BP,and ended at about 2 700 a BP. During the time, climate was warm and humid; vegetation flourished in the tropics, and the evaporation was equal to the precipitation. So the Shuangchi Maar Lake became a swamp in most of the time. But there still existed fast climate changing events in the Holocene Megathermal. During the time of 7 200 a BP, 7 000 a BP, 6 000-5 900 a BP, 4 300-4 000 a BP, the productivity of organic mater had remarkable low values, showing that the weather was cool. Before and after the Megathermal (8 000-7 400 a BP,2 700-2 300 a BP), the climate condition was cool with frequent seasonal strong storms, which demonstrated the climate pattern changing. At that time, evaporation was less than precipitation, and the Maar Lake was in its deep-water time. Consequently, the land area around the lake decreased due to the relative cold temperature, leading to the low productivity of vegetation and the low content of organic matter in the core. |
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| Keywords: | Tropical palaeoclimate Maar Lake Hainan Island organic carbon TOC/N ratio |
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