Marianne F. S. Vogel, Sébastien Joannin, Mebarek Lamara, Hugo Asselin, Adam A. Ali, Sabrina Leclercq, Cécile Latapy, Franck Richard, Yves Bergeron
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引用次数: 0
摘要
在冰川消退之后,加拿大东部被奥吉布威湖覆盖的低地地区记录了北方混合木类群的直接造林,没有最初的冻土带阶段,与从未被奥吉布威湖覆盖的地区相反。由于Ojibway湖的前冰期岛屿在8200 cal a bp湖泊流失之前就已经被植被殖民,因此我们假设这些古岛屿经历了一个非树栖阶段,最终过渡到北方混交林,从而为低地的快速和后来的殖民提供了繁殖体的来源。本文采用花粉、宏观遗骸、沉积古DNA和木炭等多指标分析方法,记录了两个古岛屿的植被组成和动态。这两个研究地点都记录了植被的逐渐建立,从只有草本植物和灌木的苔原样阶段开始,然后是以落叶松或松树为主的开放森林,最终在奥吉布韦前冰川湖最终排水前300年左右建立了北方混交林。火灾制度似乎在一定程度上驱动了古岛屿上的植被动态和多样性。古岛屿是繁殖体的来源,这有助于解释为什么在没有最初的冻土带阶段的情况下,前奥吉布威湖低地直接被北方混交林占领。
Multi-proxy analysis of early Holocene vegetation dynamics on the islands of proglacial Lake Ojibway (northeastern America)
Following deglaciation, lowland sites in eastern Canada that were covered by proglacial Lake Ojibway recorded direct afforestation with boreal mixedwood taxa, without an initial tundra phase, contrary to sites that were never covered by this lake. Because former islands of proglacial Lake Ojibway were colonized by vegetation before lake drainage around 8200 cal a bp, we hypothesized that these paleo-islands went through a non-arboreal phase which eventually transitioned to boreal mixedwoods, hence providing a source of propagules for rapid and later colonization of the lowlands. We carried out a multi-proxy analysis combining pollen, macro-remains, sedimentary ancient DNA and charcoal to document vegetation composition and dynamics on two paleo-islands. Both study sites recorded progressive vegetation establishment starting with a tundra-like phase with only herbs and shrubs, followed by open forests dominated by either larch or pine, culminating with the establishment of the boreal mixedwoods about 300 years before the final drainage of proglacial Lake Ojibway. Fire regimes seem to have partially driven vegetation dynamics and diversity on the paleo-islands. Paleo-islands were sources of propagules, which helps explain how the former Lake Ojibway lowlands were directly colonized by boreal mixedwoods, without an initial tundra phase.
期刊介绍:
The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.