Publication
Title
Rapid leaf development drives the seasonal pattern of volatile organic compound (VOC) fluxes in a 'coppiced' bioenergy poplar plantation
Author
Abstract
Leaves of fast-growing, woody bioenergy crops often emit volatile organic compounds (VOC). Some reactive VOC (especially isoprene) play a key role in climate forcing and may negatively affect local air quality. We monitored the seasonal exchange of VOC using the eddy covariance technique in a coppiced' poplar plantation. The complex interactions of VOC fluxes with climatic and physiological variables were also explored by using an artificial neural network (Self Organizing Map). Isoprene and methanol were the most abundant VOC emitted by the plantation. Rapid development of the canopy (and thus of the leaf area index, LAI) was associated with high methanol emissions and high rates of gross primary production (GPP) since the beginning of the growing season, while the onset of isoprene emission was delayed. The highest emissions of isoprene, and of isoprene photo-oxidation products (Methyl Vinyl Ketone and Methacrolein, i(ox)), occurred on the hottest and sunniest days, when GPP and evapotranspiration were highest, and formaldehyde was significantly deposited. Canopy senescence enhanced the exchange of oxygenated VOC. The accuracy of methanol and isoprene emission simulations with the Model of Emissions of Gases and Aerosols from Nature increased by applying a function to modify their basal emission factors, accounting for seasonality of GPP or LAI. center dot Some reactive volatile organic compounds (VOC) (especially isoprene) emitted in the atmosphere from leaves of widespread fast-growing woody bioenergy crops play a key role in climate forcing and local air quality. center dot Eddy covariance VOC emission and deposition fluxes were monitored in a coppiced' poplar plantation during an entire growing season, and their complex interactions with climatic and physiological variables also including canopy structural traits were explored by using the Self-organizing Map. center dot Rapid development of a canopy (and thus of leaf area index, LAI) was associated with high methanol emissions and high rates of gross primary production (GPP) since the beginning of the growing season, while the onset of isoprene emission was delayed. center dot The highest emissions of isoprene, and of isoprene photooxidation products (methyl vinyl ketone and methacrolein, iox) occurred on the hottest and sunniest days, when also GPP and evapotranspiration were highest and formaldehyde was significantly deposited. center dot The accuracy of methanol and isoprene emission simulations with the MEGAN model increased by applying a function to modify their basal emission factors, accounting for seasonality of GPP or LAI.
Language
English
Source (journal)
Plant, cell and environment. - Oxford
Publication
Oxford : 2016
ISSN
0140-7791
Volume/pages
39:3(2016), p. 539-555
ISI
000370137900007
Full text (Publishers DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 24.11.2015
Last edited 17.05.2017
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