Lafuente, ÁngelRecio, JaimeOchoa-Hueso, RaúlGallardo, AntonioPérez-Corona, EstherManrique Eol, EstebanDurán, Jorge2023-06-162023-06-162020-05-230048-9697, ESSN 1879-102610.1016/j.scitotenv.2020.139610https://hdl.handle.net/20.500.14352/6611Soil 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.engjournal articlehttps://www.sciencedirect.com/science/article/pii/S0048969720331302restricted access574631.458Carbon dioxideGlobal changeMethaneNitrous oxideN depositionBotánica (Biología)Ecología (Biología)Edafología (Biología)2417.03 Botánica General2401.06 Ecología animal