气候变化领域集成服务门户(CCPortal): Nitrous oxide emissions of undrained, forestry-drained, and rewetted boreal peatlands

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DOI	10.1016/j.foreco.2020.118494
	Nitrous oxide emissions of undrained, forestry-drained, and rewetted boreal peatlands
	Minkkinen K.; Ojanen P.; Koskinen M.; Penttilä T.
发表日期	2020
ISSN	0378-1127
卷号	478
英文摘要	Drained peatlands, especially nitrogen (N) -rich ones, are sources of nitrous oxide (N2O) to the atmosphere. As this emission is largely caused by N mineralization in oxic peat soil, rewetting the peat soil is likely to decrease the N2O emissions to similar levels with natural, undrained peatlands. Emissions from these water-saturated peat soils have often been assumed negligible, for example in the Intergovernmental Panel on Climate Change (IPCC) guidelines for national greenhouse gas inventories. However, the number of published data of annual N2O emissions from undrained peatlands is small and even smaller for rewetted peatlands. Thus, we still have limited understanding of the effects of land-use change such as drainage and rewetting. We analyzed N2O flux data, mostly previously unpublished, from 28 undrained, 65 forestry-drained, and 24 rewetted boreal peatland study sites in Finland and calculated annual N2O emissions for each site, including emissions from ditches at 51 sites. We classified the sites into nutrient-rich and nutrient-poor ones, similar to the IPCC guidelines. Annual N2O emissions from the undrained peatlands were consistently small, but not negligible, averaging 0.11 and 0.10 g m−2 a–1 in the nutrient-rich and nutrient-poor sites, respectively. Emissions from the drained peatlands were significantly higher than from the undrained peatlands in the nutrient-rich (mean 0.23 g m−2 a–1) but not in the nutrient-poor (mean 0.08 g m−2 a–1) sites. Emissions from the rewetted peatlands (means 0.05 and 0.08 g m−2 a–1 for nutrient-rich and nutrient-poor sites, respectively) were similar or lower than from the undrained ones. Emissions from ditches were similar to those from strips and correlated positively with strip emissions at the drained sites. Nutrient-rich soil (low CN ratio) and a low water table increased emissions significantly at the drained sites, whereas the continuously higher water tables kept emissions low at all undrained and rewetted sites. In conclusion, rewetting is an effective means to decrease the N2O emissions of nutrient-rich drained peatlands back to natural levels, although this natural level is not zero, as has been suggested earlier. © 2020
英文关键词	Climate change; Drainage; Greenhouse gas; Land-use change; Mire; N2O; Restoration
语种	英语
scopus关键词	Climate change; Drainage; Forestry; Greenhouse gases; Groundwater; Land use; Nitrogen oxides; Nutrients; Peat; Soils; Timber; Wetlands; Boreal peatlands; Greenhouse gas inventory; Intergovernmental panel on climate changes; Land-use change; N mineralization; Nitrous oxide; Nitrous oxide emissions; Water tables; Gas emissions; boreal forest; drainage network; Intergovernmental Panel on Climate Change; mineralization; nitrous oxide; oxic conditions; peat soil; peatland; rewetting; water table; Drainage; Forestry; Greenhouse Gases; Land Use; Nitrogen Oxides; Nutrients; Finland
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154955
作者单位	University of Helsinki, Department of Forest Sciences, Latokartanonkaari 7, P.O. Box 27, 00014 University of Helsinki, Finland; University of Helsinki, Department of Agricultural Sciences, Latokartanonkaari 7, P.O. Box 27, 00014 University of Helsinki, Finland; Natural Resources Institute Finland (Luke), P.O. Box 2, Helsinki, FI-00791, Finland
推荐引用方式 GB/T 7714	Minkkinen K.,Ojanen P.,Koskinen M.,et al. Nitrous oxide emissions of undrained, forestry-drained, and rewetted boreal peatlands[J],2020,478.
APA	Minkkinen K.,Ojanen P.,Koskinen M.,&Penttilä T..(2020).Nitrous oxide emissions of undrained, forestry-drained, and rewetted boreal peatlands.Forest Ecology and Management,478.
MLA	Minkkinen K.,et al."Nitrous oxide emissions of undrained, forestry-drained, and rewetted boreal peatlands".Forest Ecology and Management 478(2020).