Carbon concentrations in natural and restoration pools in blanket peatlands
Carbon concentrations in natural and restoration pools in blanket peatlands
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DOI：
10.1002/hyp.14520
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发表时间：
2022-02
影响因子：
3.2
通讯作者：
P. Chapman;C. Moody;T. Turner;R. McKenzie;K. Dinsmore;A. Baird;M. Billett;R. Andersen;F. Leith;J. Holden
中科院分区：
文献类型：
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作者：
P. Chapman;C. Moody;T. Turner;R. McKenzie;K. Dinsmore;A. Baird;M. Billett;R. Andersen;F. Leith;J. Holden
开放水域常年池是全球泥炭地的常见自然特征，泥炭地恢复通常会导致新池的创建，但天然和人工恢复池中不同形式的水生碳（C）的浓度尚未得到很好的研究。我们比较了自然池和恢复池（4-15岁）在苏格兰北方的三个毯泥炭地的碳浓度。在所有站点，恢复池的酸性更强，恢复池的平均溶解有机碳（DOC）浓度为23，22和31 mg L-1，而三个站点的自然池平均值分别为11，11和15 mg L-1。恢复池有一个更大的富里酸患病率比自然池和他们的DOC更芳香。恢复池溶解的二氧化碳过饱和，约10倍的大气水平，而自然池，二氧化碳浓度略高于大气水平。溶解甲烷浓度没有不同类型的池，但约200倍高于大气水平。在一个泥炭地进行的为期2.5年的定期采样显示，除了2013年温暖干燥的夏季，颗粒有机碳（POC）浓度通常低于7 mg L−1。在这个定期采样的网站，天然池被发现处理DOC，使平均池流出浓度在地表径流显着低于平均流入DOC浓度。恢复池没有发现这种效果。土壤溶液和池水化学，DOC和CO2浓度之间的关系表明，不同的过程控制C的转化，因此C的形式和数量，在自然池相比，恢复池。
Open‐water perennial pools are common natural features of peatlands globally, and peatland restoration often results in new pool creation, yet the concentrations of different forms of aquatic carbon (C) in natural and artificial restoration pools are not well studied. We compared carbon concentrations in both natural pools and restoration pools (4–15 years old) on three blanket peatlands in northern Scotland. At all sites, restoration pools were more acidic and had mean dissolved organic carbon (DOC) concentrations in restoration pools of 23, 22, and 31 mg L−1 compared with natural pool means of 11, 11 and 15 mg L−1 respectively across the three sites. Restoration pools had a greater fulvic acid prevalence than the natural pools and their DOC was more aromatic. Restoration pools were supersaturated with dissolved CO2 at around 10 times atmospheric levels, whereas for natural pools, CO2 concentrations were just above atmospheric levels. Dissolved CH4 concentrations were not different between pool types, but were ~200 times higher than atmospheric levels. Regular sampling at one of the peatland sites over 2.5 years showed that particulate organic carbon (POC) concentrations were generally below 7 mg L−1 except during the warm, dry summer of 2013. At this regularly‐sampled site, natural pools were found to process DOC so that mean pool outflow concentrations in overland flow were significantly lower than mean inflow DOC concentrations. Such an effect was not found for the restoration pools. Soil solution and pool water chemistry, and relationships between DOC and CO2 concentrations suggest that different processes are controlling the transformation of C, and therefore the form and amount of C, in natural pools compared to restoration pools.