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Holocene carbon and nitrogen accumulation rates in a boreal oligotrophic fen

机译：北方贫营养区的全新世碳和氮累积速率

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The contemporary role of mires in carbon exchange with the atmosphere is intensely debated. Thus, understanding the variation in Holocene peat accumulation is particularly important. We investigated carbon (C) and nitrogen (N) accumulation rates and their potential controls during the Holocene at the oligotrophic fen Degero Stormyr (64 degrees 11N, 19 degrees 33E, 270 m a.s.l.), Sweden. The peat stratigraphy was dominated by remains of Eriophorum spp. and oligotrophic-mesotrophic Sphagnum spp. The long-term rate of C accumulation (LORCA) was 13.7 +/- 5.5 (SD) g C m(-2) yr(-1), while the long-term rate of N accumulation (LORNA) was 0.28 +/- 0.14 (SD) g N m(-2) yr(-1). Carbon and N accumulation rates exhibited similar variations that coincided with major changes in botanical composition. The botanical composition of the peat also had a major impact on the percentage of amorphous peat (a proxy for degree of decomposition). Bulk C-13 values increased with decreasing C content, which probably reflected the relative increase of C-13 depleted compounds in the peat during decomposition. Different plant groups exhibited different relationships, likely due to different C-13 signatures of initial litters from Eriophorum spp. and Sphagnum spp. The N-15 values increased significantly with decreasing C:N ratio in bulk peat, likely reflecting preferential uptake of N-14 by plants concomitant with nitrogen mineralization. Here, we demonstrate the importance of botanical composition in affecting C and N accumulation rates under a changing climate and suggest that primary production drives the variation in rates of accumulation. Furthermore, we point out the importance of including C-13 and N-15 signatures in the analysis of peat stratigraphies to advance interpretation of Holocene peat growth and decay.
机译：泥潭在与大气进行碳交换方面的当代作用引起了激烈的争论。因此，了解全新世泥炭堆积的变化尤为重要。我们研究了全新世期间在贫营养的fen Degero Stormyr（64度11N，19度33E，270 m a.s.l.）处碳（C）和氮（N）的积累速率及其潜在控制措施。泥炭地层以Eriophorum spp遗骸为主。和贫营养的中营养的泥炭藓。 C的长期累积率（LORCA）为13.7 +/- 5.5（SD）g C m（-2）yr（-1），而N的长期累积率（LORNA）为0.28 +/- 0.14（SD）g N m（-2）yr（-1）。碳和氮的累积速率表现出相似的变化，与植物成分的主要变化相吻合。泥炭的植物成分也对无定形泥炭的百分比（分解程度的代表）有重大影响。大量C-13值随C含量的降低而增加，这可能反映了泥炭在分解过程中C-13耗竭化合物的相对增加。不同的植物群表现出不同的关系，这可能是由于Eriophorum spp的初始凋落物的C-13特征不同。和泥炭藓N-15值随着泥炭中C：N比例的降低而显着增加，这可能反映了植物优先吸收N-14并伴有氮矿化作用。在这里，我们证明了植物组成在变化的气候下影响C和N积累速率的重要性，并表明初级生产驱动了积累速率的变化。此外，我们指出了在泥炭地层分析中包括C-13和N-15签名的重要性，以推进对全新世泥炭生长和衰减的解释。

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