Dynamics and mechanisms of volatile organic compound exchanges in a winter wheat field

BVOC; Crop; Eddy covariance; MEGAN v2.1 model; Methanol; Winter wheat; Acetaldehyde; Acetic acid; Acetone; Proton transfer; Volatile organic compounds; Biogenic volatile organic compounds; Developmental stage; Proton transfer reaction mass spectrometers; Scanning techniques; Standard emission factors; Crops; Article; Belgium; Poaceae; Triticum aestivum

Abstract :

[en] 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

Disciplines :

Agriculture & agronomy
Physics

Author, co-author :

Bachy, Aurélie ; TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux, B-5030, Belgium

Aubinet, Marc ; Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges

Amelynck, C.; 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

Schoon, N.; Royal Belgian Institute for Space Aeronomy, Ringlaan 3, Brussels, B-1180, Belgium

Bodson, Bernard ; Université de Liège - ULiège > Département GxABT > Plant Sciences

Delaplace, Pierre ; Université de Liège - ULiège > Département GxABT > Plant Sciences

De Ligne, Anne ; Université de Liège - ULiège > Département GxABT > Biosystems Dynamics and Exchanges

Digrado, Anthony ; TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Passage des déportés, 2, Gembloux, B-5030, Belgium

du Jardin, Patrick ; Université de Liège - ULiège > Département GxABT > Plant Sciences

Fauconnier, Marie-Laure ; Université de Liège - ULiège > Département GxABT > Chimie des agro-biosystèmes

More authors (3 more)

Language :

English

Title :

Dynamics and mechanisms of volatile organic compound exchanges in a winter wheat field

Publication date :

2020

Journal title :

Atmospheric Environment

ISSN :

1352-2310

eISSN :

1873-2844

Publisher :

Elsevier, Netherlands

Volume :

221

Pages :

art. n°117105

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.sciencedirect.com/science/article/abs/pii/S1352231019307447

Funders :

SPW - Service Public de Wallonie [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Funding text :

This work was supported by the FRS-FNRS, Belgium [A215-MCF/ DM-A362 FC 95918, CROSTVOC project T.0086.13]. LTO maintenance was carried out within the framework of the ICOS Wallonia project, which was supported by the Service Public de Wallonie, Belgium [1217769].

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