The palaeoenvironmental development of the northeastern Vietnamese Mekong River Delta since the mid Holocene
The palaeoenvironmental development of the northeastern Vietnamese Mekong River Delta since the mid Holocene
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DOI：
10.1177/0959683610374884
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
Ulrike Proske;T. Hanebuth;H. Behling;V. L. Nguyen;T. Ta;Bùi Phát Diệm
中科院分区：
文献类型：
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作者：
Ulrike Proske;T. Hanebuth;H. Behling;V. L. Nguyen;T. Ta;Bùi Phát Diệm
对越南湄公河三角洲东北部的三个沉积岩芯进行了放射性碳测年分析(粒度、孢粉和孢子、大木炭、碳含量)，以揭示该地区自全新世中期以来的古环境历史。在全新世中期海平面高位期间，延伸的潮滩上覆盖着一条多样化的、分区的和分布广泛的红树林带(以根鞭毛类为主)。随后的退化和同时代三角洲进积导致了由Ceriop和Bruguiera主导的背部红树林群落的快速发展，但也在当地以Kandelia、Excoecaria和Phoenix为代表。在河流沿线，这个社区似乎挺了下来，即使毗邻的泛滥平原已经变成了淡水植被。一般来说，这种淡水植被具有强烈的沼泽特征，但局部地区槟榔科、豆科、桑科/荨麻科和杨梅科是重要的，反映了三角洲平原的地貌多样性。大木炭记录表明，在整个记录中都发生了植被的自然燃烧，然而，最高数量的大木炭颗粒的出现与现代人类活动有关。
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.