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The utility of process-based models for simulating N2O emissions from soils: a case study based on Costa Rican coffee plantations

Hergoualc'h, Kristell; Harmand, Jean-Michel; Cannavo, Patrice; Skiba, Ute; Oliver, Robert; Hénault, Catherine. 2009 The utility of process-based models for simulating N2O emissions from soils: a case study based on Costa Rican coffee plantations. Soil Biology & Biochemistry, 41. 2343-2355. 10.1016/j.soilbio.2009.08.023

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Abstract/Summary

Soil moisture and gaseous N-flux (N2O, N2) dynamics in Costa Rican coffee plantations were successively simulated using a mechanistic model (PASTIS) and two process-based models (NGAS and NOE). Two fertilized (250 kg N ha−1 y−1) coffee plantations were considered, namely a monoculture and a system shaded by the N2 fixing legume species Inga densiflora. In situ N2O fluxes were previously measured in these plantations. NGAS and NOE used specific microbial activities for the soils. To parameterize NGAS, we estimated N mineralization via in situ incubations and the contribution of heterotrophic soil respiration to total soil respiration. Potential denitrification rates and the proportion of denitrified N emitted as N2O were measured in the laboratory to define the values of NOE parameters, as well as nitrification rates and related N2O production rates for parameterizing both models. Soil moisture and both NGAS and NOE N2O fluxes were best modelled on an hourly time step. Soil moisture dynamics were satisfactorily simulated by PASTIS. Simulated N2O fluxes by both NGAS and NOE (3.2 and 2.1 kg N ha−1 y−1 for NGAS; 7.1 and 3.7 kg N ha−1 y−1 for NOE, for the monoculture and shaded plantations respectively) were within a factor of about 2 of the observed annual fluxes (4.3 and 5.8 kg N ha−1 y−1, for the monoculture and shaded plantations respectively). Statistical indicators of association and coincidence between simulated and measured values were satisfactory for both models. Nevertheless, the two models differed greatly in describing the nitrification and denitrification processes. Some of the algorithms in the model NGAS were apparently not applicable to these tropical acidic Andosols. Therefore, more detailed information about microbial processes in different agroecosystems would be needed, notably if process-oriented models were to be used for testing strategies for mitigating N2O emissions.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.soilbio.2009.08.023
Programmes: CEH Topics & Objectives 2009 - 2012 > Biogeochemistry > BGC Topic 1 - Monitoring and Interpretation of Biogeochemical and Climate Changes > BGC - 1.1 - Monitor concentrations, fluxes, physico-chemical forms of current and emerging pollutants ...
CEH Sections: Billett (to November 2013)
ISSN: 0038-0717
Additional Keywords: agroforestry, andosol, denitrification, heterotrophic soil respiration, Inga densiflora, mineralization, N2 fixing leguminous, nitrification, water-filled pore space (WFPS)
NORA Subject Terms: Ecology and Environment
Date made live: 19 Apr 2011 16:15
URI: http://nora.nerc.ac.uk/id/eprint/13457

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