fluxes of a bio-energy poplar plantation during a two years rotation period
Nitrous oxide emissions are of critical importance for the assumed climate neutrality of bio-energy. In this study we report on the N2O fluxes from a bio-energy poplar plantation measured with eddy covariance for 2 years, after conversion of agricultural fields to few months after harvesting of the plantation. A pulse peak of N2O was detected after the land use change and in the wake of the first heavy rainfall. The N2O-N emission during just a single week was 2.7 kg N2O-N ha−1 which represented approximately 42% of the total N2O-N emitted during the 2 years of measurements. After this peak emission, N2O fluxes were constantly rather low, not increasing after rainfall events any longer. Lowest emissions (and even N2O sink) occurred mostly during the end of the second growing season with maximum canopy development, and water table deeper than 80 cm. Gross primary production (GPP) explained 68% of the monthly averaged variability in N2O emission from August to December 2011. Probably N uptake by vegetation during the peak of the second growing season limited N2O emission, which in fact increased again after the plantation was coppiced. For the majority of the measuring period, N2O fluxes did not present a well-defined diurnal pattern, with the exception of two periods: (1) from 1922 August 2010 and (2) from SeptemberNovember 2011. In both cases wind speed played a major role in controlling the diurnal pattern in these fluxes (explaining up to 80% of the diurnal variability in N2O fluxes on 1922 August 2010), whereas at the end of the second growing season (SeptemberNovember 2011), GPP explained 73% of the diurnal pattern in N2O fluxes.
Source (journal)
GCB bioenergy. - Oxford, 2009, currens
Oxford : 2013
1757-1693 [print]
1757-1707 [online]
5 :5 (2013) , p. 536-547
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
Research group
Project info
ICOS Flanders: Ecosystem Infrastructure for Integrated Carbon Observing System.
System analysis of a bio-energy plantation: full greenhouse gas balance and energy accounting. (POPFULL)
Publication type
Publications with a UAntwerp address
External links
Web of Science
Creation 16.11.2012
Last edited 15.11.2022
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