Differentiated roles of mean climate and climate stability on post-glacial birch distributions in northern China
Differentiated roles of mean climate and climate stability on post-glacial birch distributions in northern China
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平均气候和气候稳定性对中国北方冰期后白桦分布的差异性作用
DOI：
10.1177/0959683619862038
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Song Zhaoliang
中科院分区：
文献类型：
--
作者：
Hao Qian;Liu Hongyan;Yang Shilei;Yang Weihua;Song Zhaoliang
过去树种分布的变化对于预测气候变化条件下未来的植被动态是至关重要的。本研究对中国采集的60条中纬度地区的花粉记录进行了基于花粉的重建。白桦出现在末次冰盛期(LGM)之后，当时气候逐渐好转。分布范围较小，但在全新世早期明显增大。但在全新世中期气候温暖湿润时，分布范围并未继续扩大。桦树花粉百分率与东亚夏季风强度及其变异性呈正相关，而桦树和松树花粉百分率与东亚夏季风强度呈正相关。此外，白桦和白桦的冰后分布动态受气候变化的影响，并用物种分布模型(SDMS)进行了模拟。中国中纬度北部白桦树的分布主要受东亚夏季风或其变率的驱动，尤其是在大冰期和全新世早期，气候不稳定，而松属和栎属的更替发生在全新世中期气候稳定的时候。未来不稳定的气候可能有利于桦树的发展。
Past changes in the distribution of tree species are critical to predict future vegetation dynamics under changing climate conditions. In this study, pollen-based reconstruction with 60 pollen records from mid-latitude region was performed in China. Betula emerged after the Last Glacial Maximum (LGM), when the climate ameliorated gradually. The distribution range was small but increased significantly during the early Holocene. However, when the climate was wet and warm during the mid-Holocene, the distribution range did not continue to expand. The relationships between the percentages of Betula pollen and the strength of the East Asian summer monsoon (EASM) or its variability were positively correlated, while those of Betula and Pinus had opposite trends in the study region. Besides, the post-glacial distribution dynamics of Betula platyphylla and Betula dahurica were influenced by climate change which were simulated by species distribution models (SDMs). We conclude that birch distribution in mid-latitudinal northern China was mainly driven by the EASM or its variability, especially during the LGM and early Holocene when the climate was unstable, while the replacement by Pinus and Quercus occurred during the mid-Holocene when the climate remained stable. The future unstable climate may benefit birch development.