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首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >Late Pliocene and early pleistocene vegetation and climate change revealed by a pollen record from Nihewan Basin, North China
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Late Pliocene and early pleistocene vegetation and climate change revealed by a pollen record from Nihewan Basin, North China

机译：中国北方河北省河北省河道盆地花粉记录揭示了晚期的高新水和早期营养植被和气候变化

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The Nihewan Formation is an important early Quaternary sedimentary formation in North China. We conducted pollen analyses of 183 samples and 1611 modern surface samples to characterize the processes of vegetation succession and climate change during the Pliocene-Pleistocene transition (2.89-2.34 Ma) in the Nihewan Basin. The results show that pollen assemblages are dominated by arboreal pollen, indicating that the vegetation in the study area was forest dominated and that the climate was more humid than today, however, the temperature varied substantially. The most substantial vegetation and climate changes occurred at similar to 2.8 Ma, when the pollen representation of warm and humid tolerant taxa such as evergreen Quercus and Carya disappeared, and also broadleaved deciduous types such as Ulmus, deciduous Quercus and Betula decreased obviously, on the contrary, the pollen representation of cold and drought tolerant taxa increased substantially: e.g. Picea (from generally less than 20% to more than 30%) and Chenopodiaceae (from generally less than 10% to more than 20%). The quantitative reconstructed results indicating that Tann decreased by about 2-3 degrees C and Pann decreased by similar to 150 mm compared to before 2.8 Ma, with a maximum decrease of similar to 9 degrees C for Tann and similar to 450 mm for Pann. Another important vegetation and climate changes occurred at similar to 2.6 Ma, which was the coldest and driest of the studied interval, when the vegetation was substantially simplified with spruce (generally above 80%) as the dominated types. (C) 2019 Elsevier Ltd. All rights reserved.
机译：NiHewan Mablation是华北地区的重要早期第四纪沉积形成。我们进行了183个样品和1611个现代表面样品的花粉分析，以表征Nihewan盆地的全肾上腺素过渡（2.89-2.34 mA）期间植被继承和气候变化的过程。结果表明，花粉组合由树栖花粉占主导地位，表明研究区的植被是森林的主导，而且最潮湿的气候比今天更潮湿，但温度大幅变化。当常绿栎（Evergreen Quercus和Carya等温暖和潮湿的分类群）消失的温暖和潮湿耐受性的花粉表现时，最重要的植被和​​气候变化发生在2.8 mA类似的情况下，也是乌尔姆斯，落叶栎树和桦树等宽阔的落叶类型明显下降相反，冷水和干旱耐受性的花粉表示大大增加：例如Picea（通常超过20％到30％以上）和chenopodiaceae（一般小于10％至超过20％）。定量重建结果表明丁南减少约2-3℃，庞氏与2.8 mA相比相比相似，最大值与丁南相似的最大降低，庞南相似至450毫米。当植被（通常超过80％以上）作为主导类型时，另一个重要的植被和​​气候变化发生在类似于2.6 mA的情况下，这是学习间隔的最寒冷和最严重的间隔。 （c）2019年elestvier有限公司保留所有权利。

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