A multiproxy Holocene record from a bog in the Hudson Bay Lowlands, northern Ontario, Canada, was used to evaluate how ecohydrology relates to carbon accumulation. The study site is located at a somewhat higher elevation and on coarser grained deposits than the surrounding peatlands. This promotes better drainage and thus a slower rate of carbon accumulation relative to sites with similar initiation age. The rate of peat vertical accretion was initially low as the site transitioned from a marsh to a rich fen. These lower rates took place during the warmer temperatures of the Holocene thermal maximum, confirming the importance of hydrological controls limiting peat accretion at the local scale. Testate amoebae, pollen, and plant macrofossils indicate a transition to a poor fen and then a bog during the late Holocene, as the carbon accumulation rate and reconstructed water table depth increased. The bacterial membrane lipid biomarker indices used to infer paleotemperature show a summer temperature bias and appear sensitive to changes in peat type. The bacterial membrane lipid biomarker pH proxy indicates a rich to a poor fen and a subsequent fen to bog transition, which are supported by pollen, macrofossil, and testate amoeba records.

中文翻译：

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加拿大安大略省北部哈德逊湾低地北方沼泽记录中泥炭碳积累表观速率的生态水文控制

来自加拿大安大略省北部哈德逊湾低地沼泽的多重代理全新世记录用于评估生态水文学与碳积累的关系。研究地点位于比周围泥炭地稍高的海拔和粗粒沉积物上。与具有相似起始年龄的地点相比，这促进了更好的排水，从而降低了碳积累的速度。随着场地从沼泽转变为富饶的沼泽，泥炭垂直增生率最初很低。这些较低的速率发生在全新世热最大值的较高温度期间，证实了水文控制在局部范围内限制泥炭积聚的重要性。有遗嘱的变形虫、花粉和植物大化石表明在全新世晚期过渡到贫瘠的沼泽，然后变成沼泽，随着碳积累率和重建地下水位深度的增加。用于推断古温度的细菌膜脂质生物标志物指数显示出夏季温度偏差，并且似乎对泥炭类型的变化很敏感。细菌膜脂质生物标志物 pH 值代理表明从富到贫的 fen 和随后的 fen 到沼泽的转变，这得到花粉、大型化石和有遗嘱变形虫记录的支持。