Article (Scientific journals)
Methanol exchange dynamics between a temperate cropland soil and the atmosphere
Bachy, Aurélie; Aubinet, Marc; Amelynck, Crist et al.
2018In Atmospheric Environment, 176, p. 229-239
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Keywords :
Methanol; Biogenic volatile organic compounds; Soil; Cropland; Adsorption; Desorption
Abstract :
[en] Soil methanol (CH3OH) exchange is often considered as several orders of magnitude smaller than plant methanol exchange. However, for some ecosystems, it is significant in regard with plant exchange and worth thus better consideration. Our study sought to gain a better understanding of soil exchange. Methanol flux was measured at the ecosystem scale on a bare agricultural soil over two contrasted periods using the disjunct eddy covariance by mass scanning technique. A proton-transfer-reaction mass spectrometer was used for the methanol ambient mixing ratio measurements. Bi-directional exchange dynamics were observed. Methanol emission occurred under dry and warm conditions and correlated best with soil surface temperature, whereas methanol uptake occurred under wet and mild conditions and correlated well with the methanol ambient concentration. After having tested a physical adsorption-desorption model and by confronting our data with the literature, we propose that the exchange was ruled by both a physical adsorption/desorption mechanism and by a methanol source, which still needs to be identified. The soil emission decreased when the vegetation developed. The reasons for the decrease still need to be determined. Overall, the dynamics observed at our site were similar to those reported by other studies for both cropland and forest ecosystems. The mechanism proposed in our work can thus be possibly applied to other sites or ecosystems. In addition, the methanol exchange rate was in the upper range of the exchange rates reported by other soil studies, suggesting that cropland soils are more important methanol exchangers than those in other ecosystems and should therefore be further investigated.
Disciplines :
Chemistry
Author, co-author :
Bachy, Aurélie ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Aubinet, Marc ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Amelynck, Crist;  Royal Belgian Institute for Space Aeronomy and Dept. of Analytical Chemistry, Ghent University
Schoon, Niels;  Royal Belgian Institute for Space Aeronomy
Bodson, Bernard ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions végétales et valorisation
Moureaux, Christine ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Delaplace, Pierre  ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions végétales et valorisation
De Ligne, Anne ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Heinesch, Bernard  ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biosystems Dynamics and Exchanges
Language :
English
Title :
Methanol exchange dynamics between a temperate cropland soil and the atmosphere
Publication date :
2018
Journal title :
Atmospheric Environment
ISSN :
1352-2310
eISSN :
1873-2844
Publisher :
Pergamon Press - An Imprint of Elsevier Science
Volume :
176
Pages :
229-239
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 08 June 2018

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