Comparison of the transformation of organic matter flux through a raised bog and a blanket bog

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2023-11-10 DOI:10.1007/s10533-023-01093-0
Stephan Glatzel, Fred Worrall, Ian M. Boothroyd, Katherine Heckman
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Abstract

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.

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凸起沼泽和覆盖沼泽有机质通量转化的比较
本研究提出,有机质在泥炭地的转移和转化主要是碳水化合物的优先损失和木质素样分子的保留。在这里,我们使用元素分析和热重分析来分析生物量、凋落物、泥炭土剖面、颗粒有机质和溶解有机质通量,并与海洋毯状沼泽进行比较。大分子组成和热力学分析表明,在隆起的沼泽中,有机质几乎没有转化,积累迅速,转化相对较少,在1 m深度只有13%的纤维素物质损失,而在毯状沼泽中,纤维素物质的去除率为92%。缺乏转化反映在抬高的沼泽地和地毯式沼泽地长期碳积累率的差异上。我们认为,由于缺乏水流出口,凸起的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处于封闭状态,泥炭剖面中的反应停止的高度高于毯状沼泽,在毯状沼泽中,倾斜的地点意味着孔隙水的频繁冲刷和水的排放,导致地下水位波动,反应产物的冲刷和孔隙空间保持开放。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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