DOI: 10.1016/j.atmosenv.2019.117105
论文题名: Dynamics and mechanisms of volatile organic compound exchanges in a winter wheat field
作者: Bachy A. ; Aubinet M. ; Amelynck C. ; Schoon N. ; Bodson B. ; Delaplace P. ; De Ligne A. ; Digrado A. ; du Jardin P. ; Fauconnier M.-L. ; Mozaffar A. ; Müller J.-F. ; Heinesch B.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 221 语种: 英语
英文关键词: Acetaldehyde
; Acetic acid
; Acetone
; Methanol
; pH
; Proton transfer
; Volatile organic compounds
; Biogenic volatile organic compounds
; BVOC
; Developmental stage
; Eddy covariance
; Proton transfer reaction mass spectrometers
; Scanning techniques
; Standard emission factors
; Winter wheat
; Crops
; acetaldehyde
; acetic acid
; acetone
; isoprene
; liquid nitrogen
; methanol
; terpene
; volatile organic compound
; chemical composition
; chemical compound
; crop pest
; crop plant
; detection method
; eddy covariance
; growing season
; methanol
; soil-vegetation interaction
; volatile organic compound
; wheat
; winter
; agricultural species
; air temperature
; Article
; Belgium
; canopy
; comparative study
; controlled study
; crop
; Eddy covariance
; environmental factor
; environmental management
; growing season
; leaf age
; nonhuman
; photosynthetic photon flux density
; plant development
; Poaceae
; priority journal
; proton transfer reaction mass spectrometry
; random error
; soil water content
; Triticum aestivum
; water vapor
; winter wheat
; Belgium
; Poaceae
; Triticum aestivum
学科: BVOC
; Crop
; Eddy covariance
; MEGAN v2.1 model
; Methanol
; Winter wheat
中文摘要: The understanding of biogenic volatile organic compound (BVOC) exchanges has become a key scientific issue because of their high reactivity and their impact in the atmosphere. However, so far, few studies have focused on BVOCs exchanged by agricultural species, and in particular by winter wheat, despite this species being the leading worldwide crop in terms of harvested area. This study for the first time investigated BVOC exchanges from winter wheat during most developmental stages of the plant. Fluxes were measured in Belgium at the ecosystem-scale using the disjunct eddy covariance by mass scanning technique, and a proton-transfer-reaction mass spectrometer for BVOC ambient mixing ratio measurements. As is usually observed for crops and grasses, the winter wheat field emitted mainly methanol, although bi-directional exchanges were observed. The second most exchanged compound was acetic acid which was captured during the entire growing season. Bi-directional exchanges of acetaldehyde and acetone were also reported. Terpene exchanges were 22 times smaller than oxygenated VOC (OVOC) exchanges. For all compounds, the exchanges were the most pronounced at the end of the growing season, i.e., under warm, dry and sunny conditions. Senescence-induced emissions were furthermore observed for methanol and acetaldehyde. For all investigated OVOCs, the exchanges very likely originated from both the soil and the plants. Despite their mixed origin, the MEGAN (Model of Emissions of Gases and Aerosols from Nature) v2.1 up-scaling model could adequately reproduce the methanol, acetaldehyde and acetone exchanges measured at this site during the mature and senescence phases of the plant, when the standard emission factor and the leaf age factor were adapted based on the measurements. In contrast, the model failed to reproduce the measured acetic acid exchanges. When the standard emission factor values currently assigned in MEGAN were applied, however, the exchanges were largely over-estimated for all compounds. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/161103
Appears in Collections: 气候变化与战略
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作者单位: TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux, B-5030, Belgium; Royal Belgian Institute for Space Aeronomy, Ringlaan 3, Brussels, B-1180, Belgium; Dept. of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, Ghent, B-9000, Belgium
Recommended Citation:
Bachy A.,Aubinet M.,Amelynck C.,et al. Dynamics and mechanisms of volatile organic compound exchanges in a winter wheat field[J]. Atmospheric Environment,2020-01-01,221