Fecha/hora: 15/06/2024 19:49:37

Biblioteca(s): | INIA La Estanzuela.
Fecha corriente: | 18/12/2020
Fecha de la última actualización: | 21/05/2021
Autoria: | LOICK, N.; DIXON, E.; MATTHEWS, G.P.; MÜLLER, CH.; CIGANDA, V.; LÓPEZ-AIZPÚN, M.; REPULLO, M.A.; CARDENAS, L.M.
Afiliación: | NADINE LOICK, Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB, UK; ELIZABETH DIXON, Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB, UK.; G. PETER MATTHEWS, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK.; CHRISTOPH MÜLLER, Institute of Plant Ecology, Justus Liebig University Giessen, 35392 Giessen, German.; VERONICA SOLANGE CIGANDA BRASCA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARIA LÓPEZ-AIZPÚN, LICA, Department of Chemistry, University of Navarre, Irunlarrea, 1-31008 Pamplona, Spain.; MIGUEL A. REPULLO, IFAPA, Area of Agriculture and Environment Centre Alameda del Obispo, Av. Menéndez Pidal s/n, Apdo 3092, 14080 Córdoba, Spain; LAURA M. CARDENAS, Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB, UK.
Título: | Application of a triple 15N tracing technique to elucidate N transformations in a UK grassland soil.
Año de publicación: | 2021
Fuente/Imprenta: | Geoderma, 1 March 2021, Volume 385, Article number 114844. Doi: https://doi.org/10.1016/j.geoderma.2020.114844
DOI: | 10.1016/j.geoderma.2020.114844
Idioma: | Inglés
Notas: | Article history: Received 14 August 2020/ Revised 11 November 2020/ Accepted 13 November 2020/ Available online 2 December 2020.
Contenido: | Abstract: To identify the production and consumption pathways and temporal dynamics of N2O emitted from soil, this study uses 15N-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 NH4NO3 with either the NH4+-N or the NO3?-N, or both being 15N 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 N2O emissions. To assess the utilisation of applied NO3? vs. nitrified NO3? from applied NH4+, the 15N tracing tool Ntrace was used to quantify the rates of immobilisation of NO3? and NH4+, oxidation of NH4+, mineralisation of organic N and subsequent nitrification by the analysis of the 15N in the soil. Gross transformation rates were calculated, indicating the relative importance of added NO3? and NO3? derived from nitrified added NH4+. Results show an important contribution of heterotrophic nitrification (organic N oxidation to NO3?) which was highest at the 55% water filled pore space (WFPS), decreasing in its contribution to N-transformation processes with increasing WFPS, while nitrification (NH4+ oxidation to NO3?) 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.
Palabras-Clave: | DENITRIFICATION; EMISIONES DE N20; HETEROTROPHIC NITRIFICATION; NITRIFICATION; NITROUS OXIDE.
Thesagro: | DENITRIFICACION.
Categoría del tema: | --
Registro original: | INIA La Estanzuela (LE)
Ejemplares: | LE - (103257-1) - PXI - AP - DD - PP/Geoderma/2021 -  -  - DIS