A new Quercusspecies from the upper Miocene of southwestern China and its ecological significance
| 论文编号: | |||||||||
| 作者: | Xing YW | ||||||||
| 刊物名称: | Review of Palaeobotany and Palynology | ||||||||
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| 论文题目英文: | A new Quercusspecies from the upper Miocene of southwestern China and its ecological significance | ||||||||
| 年: | Jun 2013 | ||||||||
| 卷: | 193 | ||||||||
| 期: | X | ||||||||
| 页: | 99–109 | ||||||||
| 联系作者: | Zhou ZK | ||||||||
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| 影响因子: | 1.933 | ||||||||
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| 摘要: | Quercus praedelavayi Xing Y.W. et Zhou Z.K. sp. nov. is reported from the upper Miocene of the Xianfeng flora in central Yunnan, southwestern China. The fossil species is identified based on the detailed leaf morphological and cuticular examinations. The primary venation is pinnate and the major secondary venation is craspedodromous with regular spacing. Stomata are anomocytic and occur on abaxial epidermis. Trichome bases are unicellular and multicellular. The new fossil species shows the closest affinity with Quercus delavayi, an extant species distributing in southwestern China. The responses of the functional leaf traits to the climate change were studied by comparing the leaf characters of fossil species and its nearest living relative. The stomatal density of Q. praedelavayi is higher than Q. delavayi, which suggests a lower palaeoatmospheric CO2 concentration during the late Miocene. The trichome base density of Q. praedelavayi is higher than the extant Q. delavayi. Considering the palaeoclimatic reconstruction of Xianfeng flora, it rejected the hypothesis that increase in trichome density is an adaptation to the drier environment | ||||||||
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