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Processes responsible for the nitrous oxide emission from a Costa Rican Andosol under a coffee agroforestry plantation

Hergoual'c, K.; Skiba, Ute; Harmand, J.M.; Oliver, R. 2007 Processes responsible for the nitrous oxide emission from a Costa Rican Andosol under a coffee agroforestry plantation. Biology and Fertility of Soils, 43 (6). 787-795. 10.1007/s00374-007-0168-z

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Abstract/Summary

We used the inhibitor acetylene (C2H2) at partial pressures of 10 Pa and 10 kPa to inhibit autotrophic nitrification and the reduction of nitrous oxide (N2O) to N2, respectively. Soils (Andosol) from a Coffea arabica plantation shaded by Inga densiflora in Costa Rica were adjusted to 39, 58, 76 and 87% water-filled pore space (WFPS) and incubated for 6 days in the absence or presence of C2H2. Soil respiration, nitrification rates and N2O emissions by both processes were measured in relation to soil moisture conditions. At all WFPS studied, rates of N2O and N2 productions were small (4.8; 14.7; 23 and 239.6 ng N–N2O g−1 d.w. d−1 at 39, 58, 76 and 87% WFPS, respectively), and despite a low soil pH (4.7), N2O was mainly produced by nitrification, which was responsible for 85, 91, 84 and 87% of the total N2O emissions at 39, 58, 76 and 87% WFPS, respectively. At the three smaller values of WFPS, a linear relationship was established between WFPS, soil respiration, nitrification and N2O released by nitrification; no N2 was produced by denitrification. At more anaerobic conditions achieved by a WFPS of 87%, a large rate of N2O production was measured during nitrification, and N2 production accounted for 84% of the gaseous N fluxes caused by denitrification.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s00374-007-0168-z
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.1 UK nitrogen and sulphur compounds
CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon > BG01.3 Nitroeurope NEU advanced flux network, fluxes pools and budgets
CEH Sections: Billett
ISSN: 0178-2762
Additional Keywords: N2O, Denitrification, Nitrification, Coffea arabica, Acetylene inhibition, Water-filled pore space (WFPS), Costa Rica
NORA Subject Terms: Atmospheric Sciences
Date made live: 26 Mar 2008 16:16
URI: http://nora.nerc.ac.uk/id/eprint/2500

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