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首页> 外文期刊>Quaternary Research: An Interdisciplinary Journal >Holocene development of maritime ombrotrophic peatlands of the St. Lawrence North Shore in eastern Canada
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Holocene development of maritime ombrotrophic peatlands of the St. Lawrence North Shore in eastern Canada

机译：加拿大东部圣劳伦斯北岸海洋非营养型泥炭地的全新世发展

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摘要

Macrofossil analyses were used to reconstruct long-term vegetation successions within ombrotrophic peatlands (bogs) from the northern shorelines of the St. Lawrence Estuary (Baie-Comeau) and the Gulf of St. Lawrence (Havre-St-Pierre). Over the Holocene, the timing and the ecological context of peatland inception were similar in both regions and were mainly influenced by fluctuations in relative sea level. Peat accumulation started over deltaic sands after the withdrawal of the Goldthwait Sea from 7500 cal yr BP and above silt–clay deposits left by the Laurentianmarine transgression after 4200 cal yr BP. In each region, the early vegetation communities were similar within these two edaphic contexts where poor fens with Cyperaceae and eastern larch (Larix laricina) established after land emergence. The rapid transitions to ombrotrophy in the peatlands of Baie- Comeau are associated with particularly high rates of peat accumulation during the early developmental stage. The results suggest that climate was more propitious to Sphagnum growth after land emergence in the Baie- Comeau area. Macrofossil data show that treeless Sphagnum-dominated bogs have persisted over millennia and that fires had few impacts on the vegetation dynamics. This study provides insight into peatland vegetation responses to climate in a poorly documented region of northeastern America.
机译：大型化石分析被用来重建圣劳伦斯河口（拜科莫）和圣劳伦斯湾（阿弗尔-圣皮埃尔）北部海岸线的非营养化泥炭地（沼泽）中的长期植被演替。在全新世时期，泥炭地开始的时间和生态环境在两个地区都相似，并且主要受到相对海平面波动的影响。在戈德斯威特海从7500年BP撤出之后，泥炭开始在三角洲的砂上堆积，在4200年BP之后，Laurentianmarine海侵所留下的淤泥-粘土沉积之上。在每个地区，早期的植被群落在这两个前卫环境中是相似的，这两个国土在出土后与莎草科和东部落叶松（Larix laricina）的差点形成。在贝伊-科莫（Baie-Comau）的泥炭地迅速过渡到营养平衡与泥炭在发育的早期特别高的积累率有关。结果表明，Baie-Comeau地区出现土地后，气候更有利于泥炭藓的生长。 Macrofossil的数据显示，无树的以泥炭藓为主导的沼泽已经存在了数千年，而且大火对植被动态的影响很小。这项研究提供了对美国东北部记录薄弱的地区泥炭地植被对气候的响应的见解。

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