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Temporal shifts in controls over methane emissions from a boreal bog

文献类型：期刊论文

作者Wang, Mei1,2; Wu, Jianghua2; Lafleur, Peter M.3; Luan, Junwei4; Chen, Huai5; Zhu, Xinbiao6
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2018-11-15
卷号262期号:2018页码:120-134
关键词Climate change Non-growing season Growing season Seasonal pattern Different time scales Eddy covariance
ISSN号0168-1923
DOI10.1016/j.agrformet.2018.07.002
产权排序5
文献子类Article
英文摘要We measured year-round landscape-scale methane (CH4) flux in a boreal bog from May 2014 to April 2016 using the eddy covariance technique. The objectives of the study were to investigate the controls on CH4 flux at different periods of the growing season and to quantify the annual CH4 flux budget. The daily average growing season water table (WT) ranged from -0.33 to - 0.08 m in 2014 and from -0.36 to - 0.08 m in 2015. Strong seasonal variability in the daily average CH4 fluxes was observed in both 2014 and 2015, ranging from near zero before May to a peak of above 20 nmol m(-2) s(-1) in the middle-late August in 2014 and in the early-middle September in 2015. Soil temperature at 50 cm and water table exerted interactive impact on the seasonal variation in the daily average growing season CH4 flux in both years. Soil temperature at 1 cm was negatively related to CH4 flux when water table dropped more than 0.25 m below the peat surface in 2015 growing season, suggesting that the seasonal variation in CH4 flux was dominated by the variation due to CH 4 oxidation. During the non-growing season, the daily variation in CH4 fluxes was mostly related to friction velocity in both years. In addition, daily average CH4 flux was linearly related to net ecosystem exchange of CO2 (NEE) when daily NEE was negative (Le., days with CO2 uptake larger than ecosystem respiration), but there was no correlation between them when NEE was positive (days with ecosystem respiration dominated over CO2 uptake) during the growing season. We found that this boreal bog acted as a small CH4 source of 3.7 +/- 0.9 g CH4 m(-2) from May 2014 to April 2015 and 3.1 +/- 0.9 g CH4 m(-2) from May 2015 to April 2016. These values were at the lower end of the range of CH4 emission rates reported for boreal peatlands. Non-growing season CH4 emissions accounted for 41% (the first study year) and 39% (the second study year) of the annual emissions, highlighting the importance of non-growing season CH4 emissions in estimating the annual CH4 budget and the feedback to climate.
学科主题Agriculture/agronomy
URL标识查看原文
WOS关键词CARBON-DIOXIDE ; WATER-TABLE ; SEASONAL-VARIATION ; NEURAL-NETWORKS ; DIURNAL-VARIATION ; CH4 EMISSIONS ; NORTHERN ; TEMPERATE ; EXCHANGE ; WETLANDS
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000444659300012
出版者ELSEVIER SCIENCE BV
源URL[http://210.75.237.14/handle/351003/29757]  
专题生物多样性与生态系统服务领域_生态研究
成都生物研究所_生态研究
生物多样性与生态系统服务领域_中国科学院山地生态恢复与生物资源利用重点实验室
生物多样性与生态系统服务领域_生态系统恢复与生物多样性保育四川省重点实验室
通讯作者Wu, Jianghua
作者单位1.School of Geographic Sciences, South China Normal University, Guangzhou, 510631, China;
2.Sustainable Resource Management, Memorial University of Newfoundland, Corner Brook, A2H 6P9, Canada;
3.School of the Environment, Trent University, Peterborough, ON, K9L 0G2, Canada;
4.International Center for Bamboo and Rattan, Beijing, 100102, China;
5.Key Laboratory of Mountain Ecological Restoration and Bio-resource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;
6.Atlantic Forestry Centre, Canadian Forest Service, Natural Resources Canada, Corner Brook, NL, A2H 5G4, Canada
推荐引用方式
GB/T 7714		 Wang, Mei,Wu, Jianghua,Lafleur, Peter M.,et al. Temporal shifts in controls over methane emissions from a boreal bog[J]. AGRICULTURAL AND FOREST METEOROLOGY,2018,262(2018):120-134.
APA Wang, Mei,Wu, Jianghua,Lafleur, Peter M.,Luan, Junwei,Chen, Huai,&Zhu, Xinbiao.(2018).Temporal shifts in controls over methane emissions from a boreal bog.AGRICULTURAL AND FOREST METEOROLOGY,262(2018),120-134.
MLA Wang, Mei,et al."Temporal shifts in controls over methane emissions from a boreal bog".AGRICULTURAL AND FOREST METEOROLOGY 262.2018(2018):120-134.

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来源：成都生物研究所

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