Simulated nitrogen deposition influences soil greenhouse gas fluxes in a Mediterranean dryland


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Lafuente, Ángel and Recio, Jaime and Ochoa-Hueso, Raúl and Gallardo, Antonio and Pérez-Corona, Esther and Manrique Eol, Esteban and Durán, Jorge (2020) Simulated nitrogen deposition influences soil greenhouse gas fluxes in a Mediterranean dryland. Science of the total environment, 737 (139610). pp. 1-8. ISSN 0048-9697, ESSN 1879-1026

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Soil nitrogen (N) availability is a key driver of soil-atmosphere greenhouse gas (GHG) exchange, yet we are far from understanding how increases in N deposition due to human activities will influence the net soilatmosphere fluxes of the three most important GHGs: nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2). We simulated four levels of N deposition (10, 20 and 50 kg N ha−1 yr−1 , plus unfertilised control) to evaluate their effects on N2O, CH4 and CO2 soil fluxes in a semiarid shrubland in central Spain. After 8 years of experimental fertilisation, increasing N availability led to a consistent increase in N2O emissions, likely due to simultaneous increases in soil microbial nitrification and/or denitrification processes. However, only intermediate levels of N fertilisation reduced CH4 uptake, while increasing N fertilisation had no effects on CO2 fluxes, suggesting complex interactions between N deposition loads and GHG fluxes. Our study provides novel insight into the responses of GHGs to N deposition in drylands, forecasting increases in N2O emissions, and decreases in CH4 uptake rates, with likely consequences to the on-going climate change.

Item Type:Article
Uncontrolled Keywords:Carbon dioxide; Global change; Methane; Nitrous oxide; N deposition
Subjects:Medical sciences > Biology > Botany
Medical sciences > Biology > Ecology
Medical sciences > Biology > Soil science
ID Code:62408
Deposited On:05 Oct 2020 11:22
Last Modified:05 Oct 2020 11:37

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