Bol, R.

Cardenas, L. M.

Dixon, E. R.

Gilsanz, C.

Lewicka-Szczebak, D.

Loick, N.

Matthews, P.

Well, R.

Rothamsted Repository

Geophysical Research AbstractsVol. 18, EGU2016-6613, 2016EGU General Assembly 2016© Author(s) 2016. CC Attribution 3.0 License.Elucidating the impact of nitrate and labile carbon application on spatialheterogeneity of denitrification by 15N modellingLaura Cardenas (1), Nadine Loick (1), Liz Dixon (1), Peter Matthews (2), Claudia Gilsanz (3), Roland Bol (4),Dominika Lewicka-Szczebak (5), and Reinhard Well (5)(1) Rothamsted Research, Devon, United Kingdom EX20 2SB (laura.cardenas@rothamsted.ac.uk), (2) University ofPlymouth, Plymouth, Devon PL4 8AA , (3) Mabegondo Agricultural Research Centre (CIAM-INGACAL), Xunta de Galicia,15318 Abegondo, A Coruña, Spain , (4) 3Forschungszentrum Jülich IBG-3, Wilhelm-Johnen-Straße, 52428 Jülich, Germany ,(5) Thünen Institute of Climate-Smart Agriculture, Bundesallee 50, D-38116 Braunschweig, GermanyN2O is considered to be an important GHG with soils representing its major source and accounting for approx-imately 6% of the current global warming and is also implicated in the depletion of stratospheric ozone. Theatmospheric N2O concentration has been increasing since the Industrial Revolution making the understanding ofits sources and removal processes very important for development of mitigation strategies.Bergstermann et al. (2011) found evidence of the existence of more than one pool of nitrate undergoing denitrifi-cation in a silty clay loam arable soil amended with glucose/nitrate solution. The Rayleigh type model was usedto simulate d15N of N2O using process rates and associated fractionation factors, but assumptions for some of themodel parameters had to be made due to lack of available data. In this study we carried out 2 incubation experi-ments in order to parameterise the model. To restrict the volume of soil reached by the amendment, we used blockscontaining 3 soil cores that were incubated in one vessel to measure emissions of NO, N2O, N2 and CO2 from aclay grassland soil amended with KNO3 (N) and glucose (C) in three treatments: ’1C’ only 1 core received N andC (the other 2 received water), ‘3C’ 3 cores received N and C, and ‘Control’ (received water only). The resultsshowed changes in the d15Nbulk trends after day 6 post amendment application, coinciding with the decrease ofN2O fluxes. We also report the results in the 15N site preference (SP) and d18O. We will show the results from themodel validation based on this data.

Elucidating the impact of nitrate and labile carbon application on spatial heterogeneity of denitrification by 15N modelling

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Elucidating the impact of nitrate and labile carbon application on spatial heterogeneity of denitrification by 15N modelling

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