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首页> 外文期刊>Chinese science bulletin >Vegetation evolution and millennial-scale climatic fluctuations since Last Glacial Maximum in pollen record from northern
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Vegetation evolution and millennial-scale climatic fluctuations since Last Glacial Maximum in pollen record from northern

机译：自北部花粉记录以来的冰川演化以来的植被演变和千年尺度的气候波动

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摘要

In order to study vegetation evolution and environmental change since the Last Glacial Maximum (LGM), a total of 180 pollen samples with an average time resolution of 150 years were analyzed on the top parts (0-31 m, 0-27 kaBP) of deep sea sediments from ODP Site 1144 (20 deg 3.18'N, 1170 deg 25.14'E), northeastern SCS. The characteristic features of pollen diagram include that pine dominates in the interglacial, and herb pollen dominates with a good deal of tropical-subtropical pollen in the last glacial, and from 18 kaBP the tropical-subtropical pollen influx rose abruptly, while the herbaceous pollen influx and percentage dropped quickly, indicating that climate turned warmer and more humid, and more tropical-subtropical vegetation grew on the mainland and the emerging continental shelf, while the grassland on the shelf diminished. A detailed comparison shows an earlier change of pollen assemblages at the glacial-interglacial transition between MIS6 and 5 (Termination II) than the ice volume change indicated by the oxygen isotope record, implying that mid-low latitude climate warming preceded ice sheet retreat. Millennial-scale climatic fluctuations of vegetation change in pollen record are also discussed.
机译：为了研究自上次冰河期（LGM）以来的植被演变和环境变化，在该区域的顶部（0-31 m，0-27 kaBP）上分析了总共180个花粉样本，平均时间分辨率为150年。来自南海北部ODP站点1144（北纬20度3.18'，东经1170度25.14'）的深海沉积物。花粉图的特征包括，在松间层中花粉占主导地位，在最后一个冰川中草本花粉占多数，热带-亚热带花粉占主导地位；从18 kaBP开始，热带-亚热带花粉大量涌入，而草本花粉大量涌入。百分比迅速下降，表明气候变暖和潮湿，大陆和新兴大陆架上生长着更多的亚热带植被，而该架上的草地却减少了。一项详细的比较显示，MIS6和5之间的冰-冰间过渡（终端II）花粉组合的变化比氧同位素记录指示的冰量变化更早，这意味着中低纬度气候变暖先于冰盖撤退。还讨论了花粉记录中植被变化的千年尺度气候波动。

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