气候变化领域集成服务门户(CCPortal): Long-term effect of fertilization on the greenhouse gas exchange of low-productive peatland forests

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DOI	10.1016/j.foreco.2018.10.015
	Long-term effect of fertilization on the greenhouse gas exchange of low-productive peatland forests
	Ojanen P.; Penttilä T.; Tolvanen A.; Hotanen J.-P.; Saarimaa M.; Nousiainen H.; Minkkinen K.
发表日期	2019
ISSN	0378-1127
起始页码	786
结束页码	798
卷号	432
英文摘要	Drainage of peatlands for forestry often leads to carbon dioxide (CO2) net emission from soil due to loss of peat. This emission can be compensated for by the increased tree growth. Hovewer, many drained peatlands have low tree growth due to nutrient limitations. Tree growth at these peatlands can be effectively increased by fertilization, but fertilization has been also found to increase decomposition rates. We studied the long-term effect of fertilization of low-productive forestry-drained peatlands on the complete ecosystem greenhouse gas exchange, including both soil and tree component, and accounting for CO2, methane and nitrous oxide. Five N-rich study sites (flark fens and a rich fen) and one N-poor ombrotrophic site were established. Fertilization had started at the study sites 16–67 years before our measurements. Fertilization considerably increased tree stand CO2 sink (+248–1013 g CO2 m−2 year−1). Decomposition increased on average by 45% (+431 g CO2 m−2 year−1) and litter production by 38% (+360 g CO2 m−2 year−1). Thus, on average 84% of the increased decomposition could be attributed to increased litter production and 16% to increased soil CO2 net emission due to increased loss of peat. Soil CO2 net emission correlated positively with water table depth and top soil N concentration. Fertilization increased soil CO2 net emission at the drained flark fens on average by 187 g CO2 m−2 year−1. At the rich fen, net emission decreased. The N-poor bog exhibited soil CO2 sink both with and without fertilization. Effects on methane and nitrous oxide emissions were small at most sites. The increase in tree stand CO2 sink was higher than the increase in soil CO2 net emission, indicating that fertilization has a climate cooling effect in the decadal time scale. Yet, as the fertilized plots at N-rich sites exhibited soil CO2 source or zero balance, continuation of fertilization-based forestry over several rotations would lead to progressive loss of ecosystem C. At the N-poor bog, fertilization-based forestry may have a climate-cooling effect also in the centennial time scale. © 2018 The Authors
英文关键词	Carbon dioxide; Fertilization; Greenhouse gas exchange; Methane; Nitrous oxide; Peatland forest
语种	英语
scopus关键词	Carbon dioxide; Ecosystems; Forestry; Greenhouse effect; Greenhouse gases; Groundwater; Methane; Nitrogen oxides; Peat; Soils; Timber; Wetlands; Decomposition rate; Fertilization; Forestry-drained peatlands; Greenhouse gas exchange; Nitrous oxide; Nitrous oxide emissions; Nutrient limitations; Peatland; Soil pollution; carbon dioxide; carbon emission; carbon sink; drainage network; fen; fertilizer application; forest ecosystem; gas exchange; greenhouse gas; growth rate; litter; methane; nitrous acid; ombrotrophic environment; peatland; soil carbon; soil emission; Carbon Dioxide; Ecosystems; Forestry; Greenhouse Effect; Greenhouse Gases; Methane
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/156339
作者单位	University of Helsinki, Department of Forest Sciences, P.O. Box 27, Helsinki, FI-00014, Finland; Natural Resources Institute Finland, Latokartanonkaari 9, Helsinki, FI-00790, Finland; Natural Resources Institute Finland, P.O. Box 413, FI-90014 University of Oulu, Finland; University of Oulu, Department of Genetics and Ecology, FI-90014 University of Oulu, Finland; Natural Resources Institute Finland, Yliopistokatu 6, Joensuu, FI-80100, Finland
推荐引用方式 GB/T 7714	Ojanen P.,Penttilä T.,Tolvanen A.,et al. Long-term effect of fertilization on the greenhouse gas exchange of low-productive peatland forests[J],2019,432.
APA	Ojanen P..,Penttilä T..,Tolvanen A..,Hotanen J.-P..,Saarimaa M..,...&Minkkinen K..(2019).Long-term effect of fertilization on the greenhouse gas exchange of low-productive peatland forests.Forest Ecology and Management,432.
MLA	Ojanen P.,et al."Long-term effect of fertilization on the greenhouse gas exchange of low-productive peatland forests".Forest Ecology and Management 432(2019).