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Comparison of the transformation of organic matter flux through a raised bog and a blanket bog
Biogeochemistry ( IF 4 ) Pub Date : 2023-11-10 , DOI: 10.1007/s10533-023-01093-0
Stephan Glatzel , Fred Worrall , Ian M. Boothroyd , Katherine Heckman

This study has proposed that organic matter transfer and transformation into and through a peatland is dominated by preferential loss of carbohydrates and the retention of lignin-like molecules. Here we used elemental analysis and thermogravimetric analysis to analyse the biomass, litter, peat soil profile, particulate organic matter, and dissolved organic matter fluxes sampled from a continental raised bog in comparison a maritime blanket bog. The macromolecular composition and thermodynamic analysis showed that in the raised bog there had been little or no transformation of the organic matter and the accumulation was rapid with comparatively little transformation with only 13% loss of cellulose by 1 m depth compared to 92% removal of cellulosic material in the blanket bog. The lack of transformation is reflected in a difference in long term carbon accumulation rates between raised and blanket bog sites. We propose that raised bogs, with their lack of a stream outfall, have high stable water tables that mean the pore water become thermodynamically closed and reactions cease higher in the peat profile than in a blanket bog where sloping sites mean a frequent flushing of pore water and discharge of water leading to fluctuating water tables, flushing of reaction products and pore spaces remaining open.



中文翻译:

凸起沼泽和覆盖沼泽有机质通量转化的比较

这项研究提出,有机物转移和转化到泥炭地以及通过泥炭地的过程主要是碳水化合物的优先损失和木质素类分子的保留。在这里,我们使用元素分析和热重分析来分析从大陆凸起沼泽中采样的生物量、枯落物、泥炭土剖面、颗粒有机物和溶解有机物通量,并与海洋覆盖沼泽进行比较。大分子组成和热力学分析表明,在抬高的沼泽中,有机物很少或没有转化,并且积累很快,转化相对较少,1 m 深度仅损失 13% 的纤维素,而纤维素去除率为 92%毯子沼泽中的材料。缺乏转化反映在高地沼泽地和覆盖沼泽地之间的长期碳积累率的差异上。我们认为,由于缺乏河流排污口,高位沼泽具有较高的稳定地下水位,这意味着孔隙水在热力学上变得封闭,并且在泥炭剖面中反应停止的位置高于覆盖沼泽,而覆盖沼泽的倾斜地点意味着孔隙水的频繁冲洗水的排放导致地下水位波动、反应产物被冲刷以及孔隙空间保持开放。

更新日期:2023-11-10
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