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dc.contributor.authorLoick, Nen
dc.contributor.authorDixon, Een
dc.contributor.authorMatthews, GPen
dc.contributor.authorMüller, Cen
dc.contributor.authorCiganda, VSen
dc.contributor.authorLópez-Aizpún, Men
dc.contributor.authorRepullo, MAen
dc.contributor.authorCardenas, LMen

To identify the production and consumption pathways and temporal dynamics of N O emitted from soil, this study uses N-labelled substrate-N to quantify the underlying gross N transformation rates using the Ntrace analysis tool and link them to N-emissions. In three experiments twelve soil cores each were incubated in a lab incubation system to measure gaseous emissions, while parallel incubations under the same conditions were set up for destructive soil sampling at 7 time points. Using the triple labelling technique (applying NH NO with either the NH -N or the NO -N, or both being N labelled), this study investigated the effects of 55, 70 and 85% water filled pore space (deemed to promote nitrification, both nitrification and denitrification, and denitrification, respectively) in a clay soil on gaseous N emissions and investigates the source and processes leading to N O emissions. To assess the utilisation of applied NO vs. nitrified NO from applied NH , the N tracing tool Ntrace was used to quantify the rates of immobilisation of NO and NH , oxidation of NH , mineralisation of organic N and subsequent nitrification by the analysis of the N in the soil. Gross transformation rates were calculated, indicating the relative importance of added NO and NO derived from nitrified added NH . Results show an important contribution of heterotrophic nitrification (organic N oxidation to NO ) which was highest at the 55% water filled pore space (WFPS), decreasing in its contribution to N-transformation processes with increasing WFPS, while nitrification (NH oxidation to NO ) was contributing the most at 70% WFPS. The contribution of denitrification increased with increasing WFPS, but only became dominant at 85% WFPS. While denitrification still showed to be most important at high and nitrification at lower WFPS, the actual % WFPS values were not as expected and highlight the fact that WFPS is a contributor, but not the sole/most important parameter determining the type of N-transformation processes taking place. 2 4 3 4 3 2 3 3 4 3 4 4 3 3 4 3 4 3 15 + − 15 − − + 15 − + + 15 − − + − + −

dc.titleApplication of a triple <sup>15</sup>N tracing technique to elucidate N transformations in a UK grassland soilen
dc.typeJournal Article
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Geography, Earth and Environmental Sciences
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Professional Services staff
dc.rights.embargoperiodNot knownen
rioxxterms.typeJournal Article/Reviewen

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