气候变化领域集成服务门户(CCPortal): Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes

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DOI	10.1029/2017GB005747
	Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes
	Rinne J.; Tuittila E.-S.; Peltola O.; Li X.; Raivonen M.; Alekseychik P.; Haapanala S.; Pihlatie M.; Aurela M.; Mammarella I.; Vesala T.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1087
结束页码	1106
卷号	32 期号:7
英文摘要	We have analyzed decade-long methane flux data set from a boreal fen, Siikaneva, together with data on environmental parameters and carbon dioxide exchange. The methane flux showed seasonal cycle but no systematic diel cycle. The highest fluxes were observed in July–August with average value of 73 nmol m−2 s−1. Wintertime fluxes were small but positive, with January–March average of 6.7 nmol m−2 s−1. Daily average methane emission correlated best with peat temperatures at 20–35 cm depths. The second highest correlation was with gross primary production (GPP). The best correspondence between emission algorithm and measured fluxes was found for a variable-slope generalized linear model (r2 = 0.89) with peat temperature at 35 cm depth and GPP as explanatory variables, slopes varying between years. The homogeneity of slope approach indicated that seasonal variation explained 79% of the sum of squares variation of daily average methane emission, the interannual variation in explanatory factors 7.0%, functional change 5.3%, and random variation 9.1%. Significant correlation between interannual variability of growing season methane emission and that of GPP indicates that on interannual time scales GPP controls methane emission variability, crucially for development of process-based methane emission models. Annual methane emission ranged from 6.0 to 14 gC m−2 and was 2.7 ± 0.4% of annual GPP. Over 10-year period methane emission was 18% of net ecosystem exchange as carbon. The weak relation of methane emission to water table position indicates that space-to-time analogy, used to extrapolate spatial chamber data in time, may not be applicable in seasonal time scales. ©2018. The Authors.
英文关键词	carbon dioxide; flux; greenhouse gas; methane; peatland; wetland
语种	英语
scopus关键词	annual variation; carbon dioxide; carbon emission; carbon flux; functional change; growing season; homogeneity; methane; net ecosystem exchange; peatland; primary production; seasonal variation; temporal variation; water table; wetland
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129815
作者单位	Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; School of Forest Sciences, University of Eastern Finland, Joensuu, Finland; Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland; Environmental Soil Science, Department of Agricultural Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland; Finnish Meteorological Institute, Helsinki, Finland; Institute for Atmospheric and Earth System Research/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
推荐引用方式 GB/T 7714	Rinne J.,Tuittila E.-S.,Peltola O.,et al. Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes[J],2018,32(7).
APA	Rinne J..,Tuittila E.-S..,Peltola O..,Li X..,Raivonen M..,...&Vesala T..(2018).Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes.Global Biogeochemical Cycles,32(7).
MLA	Rinne J.,et al."Temporal Variation of Ecosystem Scale Methane Emission From a Boreal Fen in Relation to Temperature, Water Table Position, and Carbon Dioxide Fluxes".Global Biogeochemical Cycles 32.7(2018).