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标题：Respiration and emissions of methane and nitrous oxide from a boreal peatland complex comprising different land-use types
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作者：Pirkko Mustamo ; Marja Maljanen ; Maarit Hyvärinen 等
期刊名称：Boreal Environment Research
印刷版ISSN：1239-6095
出版年度：2016
卷号：21
期号：5-6
页码：405-426
语种：English
出版社：Finnish Limnological Society
摘要：Greenhouse gas (GHG) emissions from pristine peatlands and peatlands drained for agriculture, forestry or peat extraction have been studied intensively. However, few studies have compared GHG emissions from peatlands under different land-use type within the same peatland area. This study examined methane (CH4) and nitrous oxide (N2O) emissions and respiration (CO2) from a peatland complex in northern Finland, including a peatland used for grass cultivation, a Pinus sylvestris and Betula pubescens dominated forested peatland, a peat-extraction site and a pristine mire. Gas fluxes were measured in 2011 and 2012 with chambers during the snow-free period, and using the snow-gradient method in winter 2012/2013. Soil respiration was highest in the cultivated site (median during growing season 350 mg CO2 m–2 h–1), and lower in the forest site and in the peat-extraction site (median for growing season 49 and 130 mg CO2 m–2 h–1, respectively). The peat-extraction site and the cultivated site were large sources of N2O during the growing season (median 89 and 28 μg m–2 h–1, respectively) and during the winter (median 56 and 460 μg m–2 h–1, respectively). The pristine site was a large source of CH4 during the growing season (median 0.98 mg m–2 h–1), whereas CH4 emissions from the drained sites during the growing season were minor. However, during winter, the peat-extraction site and the cultivated site emitted CH4 (median 0.58 and 0.029 mg m–2 h–1, respectively). The cultivated site had the highest estimated CO2 equivalent emissions, due to the high CO2 and N2O fluxes, but the peat-extraction site also had large annual emissions, mainly as N2O. The study suggests that rising groundwater level from 60 to 40 cm could potentially mitigate the emissions from the cultivated site.