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- W236566229 abstract "In tropical areas, nitrogen (N) emission, transport and deposition are projected to increase rapidly in the next decades. In this study, the consequences of elevated N input on trace gases emissions from a tropical lowland forest soil were evaluated. The study site is located in Gigante Peninsula, Panama, which included control and N addition treatments each with four replicate plots. Urea-N was applied twice in 2006 (April 28 and June 6) at a rate of 31.25 kg N ha−1 each application. Nitrous oxide (N2O), nitric oxide (NO), carbon dioxide (CO2) and methane (CH4) fluxes were intensively measured prior to and until one month after the second N application; this measurement period was within the beginning of the rainy season. We observed significantly higher NO emissions from the N-fertilised than the control plots, but N2O, CO2 and CH4 fluxes did not differ. The increased NO fluxes were largely observed during the first week after the second fertilisation, when water-filled pore space (WFPS) has increased as the rainy season progressed. N2O emissions could possibly increase with N addition when soil moisture further increase into the rainy season. The significant correlation between N2O + NO fluxes and NH4 levels and the range of WFPS (40–60%) indicated that N trace gases were possibly predominantly produced by nitrification. The fertiliserinduced N oxide emission was 3% of the applied N. The CO2 and CH4 fluxes indicated that initial N addition did not bring detectable change in microbial decomposition and root respiration for CO2 emissions and in CH4 consumption and production for CH4 fluxes, at least during the early rainy season covered in our measurement." @default.
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- W236566229 date "2007-05-01" @default.
- W236566229 modified "2023-09-24" @default.
- W236566229 title "Immediate Impact of Elevated Nitrogen Input on Trace Gases Emissions in an old-Growth Lowland Forest in Panama" @default.
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