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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Fluvial carbon flux from headwater peatland streams: Significance of particulate carbon flux
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Fluvial carbon flux from headwater peatland streams: Significance of particulate carbon flux

机译：源于泥炭地河流的河流碳通量：颗粒碳通量的意义

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The extensive blanket peatlands of the UK uplands account for almost half of total national terrestrial carbon storage. However, much of the blanket peat is severely eroded so that the contemporary role of the peatland system in carbon sequestration is compromised by losses of organic carbon in dissolved (DOC) and particulate (POC) form in the fluvial system. This paper presents the first detailed assessment of dissolved and organic carbon losses from a severely eroded headwater peatland (River Ashop, South Pennines, UK). Total annual fluvial organic carbon losses range from 29-106MgC km, ~(-2) decreasing from the headwaters to the main catchment outlet. In contrast to less eroded systems fluvial organic carbon flux is dominated by POC. POC:DOC ratios decrease from values of 4 in the headwaters to close to unity at the catchment outlet. These results demonstrate the importance of eroding headwater sites as sources of POC to the fluvial system. Comparison with a range of catchment characteristics reveals that drainage density is the best predictor of POC:DOC but there is scatter in the relation in the headwaters. Steep declines in specific POC yield from headwater catchments are consistent with storage of POC within the fluvial system. Key to the significance of fluvial carbon flux in greenhouse gas budgets is understanding the fate of fluvial carbon. Further work on the fate of POC and the role of floodplains in fluvial carbon cycling is urgently required.
机译：英国高地广泛的毯状泥炭地几乎占全国陆地碳储存总量的一半。但是，许多毯子泥炭受到严重侵蚀，因此泥炭地系统在固碳中的现代作用因河流系统中溶解的有机碳（DOC）和颗粒（POC）形式的损失而受到损害。本文提出了对严重侵蚀的源头泥炭地（英国南彭尼斯的River Ashop）的溶解碳和有机碳损失的首次详细评估。每年河流有机碳的总损失范围为29-106MgC km，从上游源头到主要集水口的〜（-2）减少。与侵蚀较少的系统相反，河流有机碳通量以POC为主。 POC：DOC的比例从源头的4降低到集水口的接近1。这些结果表明，侵蚀上游源头作为河流系统中POC来源的重要性。与一系列流域特征的比较表明，排水密度是POC：DOC的最佳预测指标，但在源水中的关系存在分散性。来自上游水源地的特定POC产量的急剧下降与河流系统内POC的存储相一致。河流碳通量中河流碳通量重要性的关键是了解河流碳的命运。迫切需要进一步研究POC的命运以及洪泛区在河流碳循环中的作用。

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