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Carbon accumulation in peatlands along a boreal to subarctic transect in eastern Canada
The Holocene ( IF 2.4 ) Pub Date : 2021-01-17 , DOI: 10.1177/0959683620988031
Guillaume Primeau 1, 2 , Michelle Garneau 1, 2
Affiliation  

In this study, we investigated the links between peat carbon accumulation and past ecological and hydrological conditions in three peatlands (Bouleau, Mista, Auassat) which developed along a South-North transect within a watershed encompassing the boreal and subarctic domain in Eastern Canada. Peatland development and long-term apparent rates of carbon accumulation (LORCA) were asynchronous in the watershed, suggesting an influence of both latitude and topography (altitude) on the length of the growing season (GGD0). Results show that peat initiation within the three peatlands (respectively ca. 9070, 8400, and 6270 cal BP) was delayed after the deglaciation and that LORCA (respectively 35.5, 15.4, and 9.0 g C m−2 yr−1) decreased from South to North. Peatland development and fen to bog transitions were found to be almost synchronous for the two southernmost sites. The fen to bog transition in the northernmost subarctic site was delayed until the 20th century, owing to the less favorable climatic conditions. This suggests that recent warming has extended the length of the growing season and increased Sphagnum growth enough to potentially influence an ecosystem state-shift as observed in other Subarctic regions of eastern Canada.



中文翻译:

加拿大东部从寒带到北极的泥炭地碳积累

在这项研究中,我们调查了三个泥炭地(Bouleau,Mista,Auassat)的泥炭碳积累与过去的生态和水文状况之间的联系,这些泥炭地沿着一个南北样带在一个分水岭内发展,该分水岭涵盖了加拿大东部的寒带和北极地区。在该流域,泥炭地的发展和长期表观碳积累速率(LORCA)是异步的,这表明纬度和地形(海拔)对生长期的影响(GGD 0)。结果表明,在冰消作用之后,三个泥炭地(分别约为9070、8400和6270 cal BP)内的泥炭启动被延迟,而LORCA(分别为35.5、15.4和9.0 g C m -2 yr -1)被延迟。)从南到北下降。在两个最南端的地点,泥炭地的发展和从沼泽到沼泽的转变几乎是同步的。由于不利的气候条件,最北端的亚北极地区的to到沼泽过渡被推迟到20世纪。这表明最近的变暖延长了生长期,并增加了泥炭藓的生长,足以潜在影响加拿大东部亚北极地区的生态系统状态转变。

更新日期:2021-01-18
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