DOI: 10.1111/gcb.12518
论文题名: Greenhouse gas budget (CO2, CH4 and N2O) of intensively managed grassland following restoration
作者: Merbold L. ; Eugster W. ; Stieger J. ; Zahniser M. ; Nelson D. ; Buchmann N.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 6 起始页码: 1913
结束页码: 1928
语种: 英语
英文关键词: Carbon dioxide
; Carbon sink
; Eddy covariance
; Methane
; Nitrous oxide
; Ploughing
; QCLAS
; SwissFluxNet
Scopus关键词: absorption
; carbon dioxide
; carbon sink
; concentration (composition)
; emission inventory
; environmental restoration
; fertilizer application
; grassland
; greenhouse gas
; methane
; nitrous oxide
; plowing
; source-sink dynamics
; sowing
; temporal variation
; trace gas
; Switzerland
; air pollutant
; carbon dioxide
; gas
; methane
; nitrous oxide
; air pollutant
; analysis
; environmental monitoring
; environmental protection
; gas
; grassland
; greenhouse effect
; metabolism
; spectroscopy
; Switzerland
; Air Pollutants
; Carbon Dioxide
; Conservation of Natural Resources
; Environmental Monitoring
; Gases
; Grassland
; Greenhouse Effect
; Methane
; Nitrous Oxide
; Spectrum Analysis
; Switzerland
英文摘要: The first full greenhouse gas (GHG) flux budget of an intensively managed grassland in Switzerland (Chamau) is presented. The three major trace gases, carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) were measured with the eddy covariance (EC) technique. For CO2 concentrations, an open-path infrared gas analyzer was used, while N2O and CH4 concentrations were measured with a recently developed continuous-wave quantum cascade laser absorption spectrometer (QCLAS). We investigated the magnitude of these trace gas emissions after grassland restoration, including ploughing, harrowing, sowing, and fertilization with inorganic and organic fertilizers in 2012. Large peaks of N2O fluxes (20-50 nmol m-2 s-1 compared with a <5 nmol m-2 s-1 background) were observed during thawing of the soil after the winter period and after mineral fertilizer application followed by re-sowing in the beginning of the summer season. Nitrous oxide (N2O) fluxes were controlled by nitrogen input, plant productivity, soil water content and temperature. Management activities led to increased variations of N2O fluxes up to 14 days after the management event as compared with background fluxes measured during periods without management (<5 nmol m-2 s-1). Fluxes of CO2 remained small until full plant development in early summer 2012. In contrast, methane emissions showed only minor variations over time. The annual GHG flux budget was dominated by N2O (48% contribution) and CO2 emissions (44%). CH4 flux contribution to the annual budget was only minor (8%). We conclude that recently developed multi-species QCLAS in an EC system open new opportunities to determine the temporal variation of N2O and CH4 fluxes, which further allow to quantify annual emissions. With respect to grassland restoration, our study emphasizes the key role of N2O and CO2 losses after ploughing, changing a permanent grassland from a carbon sink to a significant carbon source. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62153
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Environmental Systems Science, ETH Zurich, Universitaetsstr. 2, Zurich, 8092, Switzerland; Aerodyne Research Inc., 45 Manning Rd, Billerica, MA 01821, United States
Recommended Citation:
Merbold L.,Eugster W.,Stieger J.,et al. Greenhouse gas budget (CO2, CH4 and N2O) of intensively managed grassland following restoration[J]. Global Change Biology,2014-01-01,20(6)