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Nitrous oxide emissions from European agriculture - an analysis of variability and drivers of emissions from field experiments

Journal article
Authors R. M. Rees
J. Augustin
G. Alberti
B. C. Ball
P. Boeckx
A. Cantarel
S. Castaldi
N. Chirinda
B. Chojnicki
M. Giebels
H. Gordon
B. Grosz
L. Horvath
R. Juszczak
Åsa Kasimir Klemedtsson
Leif Klemedtsson
S. Medinets
A. Machon
F. Mapanda
J. Nyamangara
J. E. Olesen
D. S. Reay
L. Sanchez
A. S. Cobena
K. A. Smith
A. Sowerby
M. Sommer
J. F. Soussana
M. Stenberg
C. F. E. Topp
O. van Cleemput
A. Vallejo
C. A. Watson
M. Wuta
Published in Biogeosciences
Volume 10
Issue 4
Pages 2671-2682
ISSN 1726-4170
Publication year 2013
Published at Department of Earth Sciences
Department of Biological and Environmental Sciences
Pages 2671-2682
Language en
Links dx.doi.org/10.5194/bg-10-2671-2013
https://gup.ub.gu.se/file/108596
Keywords filled pore-space, n2o emissions, grassland systems, co2 emissions, soils, management, fluxes, fertilization, crop
Subject categories Earth and Related Environmental Sciences

Abstract

Nitrous oxide emissions from a network of agricultural experiments in Europe and Zimbabwe were used to explore the relative importance of site and management controls of emissions. At each site, a selection of management interventions were compared within replicated experimental designs in plot based experiments. Arable experiments were conducted at Beano in Italy, El Encin in Spain, Foulum in Denmark, Logården in Sweden, Maulde in Belgium, Paulinenaue in Germany, Harare in Zimbabwe and Tulloch in the UK. Grassland experiments were conducted at Crichton, Nafferton and Peaknaze in the UK, Gödöllö in Hungary, Rzecin in Poland, Zarnekow in Germany and Theix in France. Nitrous oxide emissions were measured at each site over a period of at least two years using static chambers. Emissions varied widely between sites and as a result of manipulation treatments. Average site emissions (throughout the study period) varied between 0.04 and 21.21 kg N2O-N ha−1 yr−1, with the largest fluxes and variability associated with the grassland sites. Total nitrogen addition was found to be the single most important determinant of emissions, accounting for 15% of the variance (using linear regression) in the data from the arable sites (p < 0.0001), and 77% in the grassland sites. The annual emissions from arable sites were significantly greater than those that would be predicted by IPCC default emission factors. Variability in N2O within sites that occurred as a result of manipulation treatments was greater than that resulting from site to site and year to year variation, highlighting the importance of management interventions in contributing to greenhouse gas mitigation.

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