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The palaeoenvironmental development of the northeastern Vietnamese Mekong River Delta since the mid Holocene

机译：全新世中期以来越南东北湄公河三角洲的古环境发展

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摘要

Three radiocarbon-dated sediment cores from the northeastern Vietnamese Mekong River Delta have been analysed with a multiproxy approach (grain size, pollen and spores, macro-charcoal, carbon content) to unravel the palaeoenvironmental history of the region since the mid Holocene. During the mid-Holocene sea-level highstand a diverse, zoned and widespread mangrove belt (dominated by Rhizophora) covered the extended tidal flats.The subsequent regression and coeval delta progradation led to the rapid development of a back-mangrove community dominated by Ceriops and Bruguiera but also represented locally by e.g. Kandelia, Excoecaria and Phoenix. Along rivers this community seems to have endured even when the adjoining floodplain had already shifted to freshwater vegetation. Generally this freshwater vegetation has a strong swamp signature but locally Arecaceae, Fabaceae, Moraceae/ Urticaceae and Myrsinaceae are important and mirror the geomorphological diversity of the delta plain.The macro-charcoal record implies that natural burning of vegetation occurred throughout the records, however, the occurrence of the highest amounts of macro-charcoal particles is linked with modern human activity.
机译：越南东北湄公河三角洲的三个放射性碳定年沉积物核芯采用多代理方法（粒度，花粉和孢子，大木炭，碳含量）进行了分析，以揭示自全新世中期以来该地区的古环境历史。在全新世中期海平面高位上，多样化的，分区的和广泛的红树林带（以Rhizophora为主）覆盖了延伸的潮滩。随后的退化和同代三角洲的退化导致了以Ceriops和布鲁吉耶拉（Bruguiera），但也有本地代表，例如坎德里亚，Excoecaria和凤凰城。即使在毗邻的洪泛区已经转移到淡水植被的情况下，沿河沿岸的这个社区似乎也能忍受。一般来说，这种淡水植被具有很强的沼泽特征，但当地的槟榔科，豆科，桑科/荨麻科和桃金娘科很重要，反映了三角洲平原的地貌多样性。宏观木炭记录表明，整个记录中都发生了自然燃烧的植被。大量木炭颗粒的出现与现代人类活动有关。

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