Last Glacial Maximum, early Holocene and modern environments of the northern South China Sea region: Insight from SEM analysis of Oak (Quercus) pollen.
Last Glacial Maximum, early Holocene and modern environments of the northern South China Sea region: Insight from SEM analysis of Oak (Quercus) pollen.
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DOI：
10.1016/j.scitotenv.2019.07.062
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发表时间：
2019-07
期刊：
影响因子：
--
通讯作者：
Lu Dai;Qinghe Hao;Ji-bin Xue;Limi Mao
中科院分区：
文献类型：
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作者：
Lu Dai;Qinghe Hao;Ji-bin Xue;Limi Mao
利用现代（即来自中国南方的 18 个物种）的扫描电子显微镜 (SEM) 图像以及来自南海北部 (SCS) 海洋和陆地沉积物的化石花粉粒，在属下（即亚属到物种）中鉴定了橡树 (Quercus) 花粉。栎树外壁雕刻的关键形态特征用于将花粉分为常绿类和落叶类，这种区别适用于末次盛冰期（LGM）和全新世早期的橡树花粉化石。来自现代珠江和南海北部的栎属花粉的存在表明从温带内陆到南海周围热带地区的长距离运输。来自南海北部地区陆地和海洋沉积物的化石橡树花粉表明这两种沉积环境之间的花粉代表性不同，陆地地点以常绿栎类为主，而海洋地点则显示出更多的落叶橡树物种。末次盛世海洋沉积物中常绿橡树花粉和落叶栎花粉的存在表明这一时期的降温程度仅为中度，而海洋核心落叶栎花粉的急剧增加以及花粉流入值普遍较高，反映了河流流量的增加，这反过来又与该地区全新世早期降水量的增加有关。
Oak (Quercus) pollen was identified at the infra-generic (i.e. sub-genus to species) utilizing Scanning Electron Microscope (SEM) images of modern (i.e. 18 species from southern China) and fossil pollen grains from northern South China Sea (SCS) marine and terrestrial sediments. Key morphological characteristics ofQuercusexine sculpture were used to separate the pollen into evergreen and deciduous groups, with this distinction applied to the fossil oak pollen from the Last Glacial Maximum (LGM) and early Holocene periods. The presence ofQuercuspollen from the modern Pearl River and northern SCS suggests long distance transport from inland temperate to tropical regions surrounding the SCS. Fossil oak pollen from terrestrial and marine sediments from the northern SCS region suggests different pollen representation between these two sedimentary environments, with the terrestrial site dominated by evergreenQuercustypes and the marine location showing greater representation of deciduous oak species. The presence of both evergreen and deciduous oak pollen in the LGM age marine sediments suggests only moderate cooling during this time period, while the dramatic increase of deciduousQuercuspollen in the marine core, as well as generally higher pollen influx values, reflects greater fluvial discharge, which in turn is linked to increased precipitation in the region during the early Holocene period.