Abstract A Greenlandian (Early Holocene) palaeochannel of the Meuse River is described from Autrecourt-et-Pourron in the Ardennes region of northern France. During the Younger Dryas, fluvial deposits represent a high-energy, sinuous palaeochannel, but at the onset of the Holocene, progressive channel abandonment resulted in the establishment of a low-energy meandering river system. Well-dated studies using palynology, carpology, malacology and geomorphology reveal a Greenlandian succession of changes in fluvial dynamics and vegetation. Between 11,700 and 11,400 cal yr BP, warmer temperatures led to the development of a birch community (Betula sp.) within an open grassland, dominated by herbaceous cold-adapted plants (Linum alpinum, Plantago montana, Artemisia sp., Juniperus sp.). Between 11,400 and 11,100 cal yr BP, the river and the vegetation dynamics reflected two short-term climate events. Around 11,400 cal yr BP, the palaeochannel became separated from the active channels of the Meuse River but remained dominated by waterlogged wetlands. This cold and wet phase represents the “Preboreal Oscillation” also referred as the “11.4 ka event”. Around 11,300 cal yr BP, the records suggest that fire frequency increased close to the channel, and may indicate a dry episode that reflects a sharp, short-lived rise in temperature. Between 11,100 and 10,700 cal yr BP (Late Preboreal phase), the channel received flood deposits again. Salix and helophytes developed while Populus colonised the riverbank. From 10,700 cal yr BP, at the beginning of the Boreal phase, the palaeochannel was finally abandoned and dense temperate woodland with Corylus avellana and Quercus spp. became established. Based on its high chronological resolution, Autrecourt-et-Pourron represents a key locality in north-western Europe to investigate environmental change in connection with Early Holocene short climate variations. In addition, the results highlight the valuable contribution of carpological analyses in improving the spatial resolution of reconstructions of vegetation cover.

中文翻译：

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对格陵兰（全新世早期）气候变化的古生态响应：来自 Autrecourt-et-Pourron（法国阿登）默兹河废弃河道序列的洞察

摘要 描述了位于法国北部阿登地区的 Autrecourt-et-Pourron 的默兹河格陵兰（全新世早期）古河道。在新仙女木时期，河流沉积物代表了一个高能量、蜿蜒的古河道，但在全新世开始时，逐渐废弃的河道导致建立了一个低能量的蜿蜒河流系统。使用孢粉学、鲤科动物学、软体动物学和地貌学进行的过时研究揭示了格陵兰河流动力学和植被变化的连续性。在 11,700 和 11,400 cal yr BP 之间，温度升高导致在开阔的草地内形成桦木群落（Betula sp.），主要是草本冷适应植物（Linum alpinum、Plantago montana、Artemisia sp.、Juniperus sp.） . 在 11,400 和 11,100 cal yr BP 之间，河流和植被动态反映了两个短期气候事件。大约在 11,400 cal yr BP，古河道与默兹河的活跃河道分离，但仍以淹水湿地为主。这个寒冷和潮湿的阶段代表了“北极前振荡”，也称为“11.4 ka 事件”。大约在 11,300 cal yr BP，记录表明靠近通道的火灾频率增加，并且可能表明干燥事件反映了温度的急剧、短暂的上升。在 11,100 和 10,700 cal yr BP（晚北前阶段）之间，该通道再次收到洪水沉积物。当杨树在河岸上定居时，柳属植物和草本植物得到了发展。从 10,700 cal yr BP 开始，在北方阶段开始时，古河道终于被遗弃了，拥有 Corylus avellana 和 Quercus spp 的茂密温带林地。成立。Autrecourt-et-Pourron 具有较高的年代分辨率，是欧洲西北部研究与早期全新世短期气候变化相关的环境变化的关键地区。此外，结果突出了 Carpological 分析在提高植被覆盖重建的空间分辨率方面的宝贵贡献。