| 龙感湖地区近3000年来的植被及其气候定量重建 |
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| 引用本文： | 童国榜,吴瑞金.龙感湖地区近3000年来的植被及其气候定量重建[J].海洋地质与第四纪地质,1997,17(2):53-61. |
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| 作者姓名： | 童国榜 吴瑞金 |
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| 作者单位： | 地质矿产部水文地质工程地质研究所，中国科学院南京地理与湖泊研究所 |
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| 摘 要： | 本文依据龙感湖钻孔的孢粉及硅藻资料，探讨了该地区近３０００年来的植被发展及气候变化，通过数值分析方法，重建了年均温及年降水的时间序列，发现气候波动存在的两个阶段，（依１．５ｋａＢ．Ｐ．前后划分）四个旋回（０．８ｋａ的准周期）两个突变事件（３ｋａＢ．Ｐ）前后的冷暖急剧变化及１ｋａＢ．Ｐ的降温事件）。这些变化与敦德冰心及固城湖孢粉反映的气候波动有较好的一致性，具有全球变化意义。
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| 关 键 词： | 龙感湖 孢子花粉 硅藻 古气候 晚全新世 植被 |
VEGETATION AND CLIMATIC QUANTITATIVE RECONSTRUCTION OF LONGGAN LAKE SINCE THE PAST 3000 YEARS |
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| Tong,Guobang,Shi,Ying.VEGETATION AND CLIMATIC QUANTITATIVE RECONSTRUCTION OF LONGGAN LAKE SINCE THE PAST 3000 YEARS[J].Marine Geology & Quaternary Geology,1997,17(2):53-61. |
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| Authors: | Tong Guobang Shi Ying |
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| Abstract: | According to the sporopollen and diatom data from the Longgan Lake drilling,this paper mainly deals with the vegetational and climatic changes during the last 3000 years in Longgan Lake,Anhui Province.The annual average temperature and annual precipitation were reconstructed by making use of the method of numerical value analysis.The environment of this region changed as follows: (1)The vegetational development has two stages:about 1500 years ago,the vegetation was represented by forest and then replaced by sylvosteppe.In about 0 8kaB.P.,the degree of human impact on nature environment increased,resulting in sparse vegetation,more production of Pinus and prosperous pteridophyta. (2)The development of diatom indicated that:when climate was cold and dry,the lake shrank with the plankton types of diatom decreasing and coastal species increasing in the diatom zones.Moreover,the cold climate also resulted in monotonous assemblages and poor diatom. (3)The climatic changes were divided into two stages (at about 1 5kaB.P.),four cycles(with each cycle period of 0 8ka) and two sudden change events(the calamity event which was caused by a rapid change of climate at about 3kaB.P. resulted in a relative short warm period between two cold periods, and the other lower temperature event was about 1kaB.P.). All these changes above can be compared to the record of Dunde ice core and the climatic changes in Gucheng Lake. |
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| Keywords: | Longgan Lake sporopollen diatom palaeoclimatic reconstruction Late Holocene |
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