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dc.rights.licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/ve/
dc.contributor.authorPansu, Marc
dc.contributor.authorMachado Díaz, Daniel
dc.contributor.authorBottner, Pierre
dc.contributor.authorSarmiento, Lina
dc.date.accessioned2014-10-28T19:57:13Z
dc.date.available2014-10-28T19:57:13Z
dc.date.issued2013-03-25
dc.identifier.urihttp://www.saber.ula.ve/handle/123456789/39191
dc.description.abstractAlthough nitrogen (N) is often linked to carbon (C) in organic molecules, C is carried from the tmosphere to the soil through plants while N is carried from the soil to plants by microbial transformations. Many schemes have been proposed to describe the microbial conversion between organic and inorganic forms of N but current models do not fully represent the microbial control over these conversions. This study followed the transfer of 15N between plant materials, microorganisms, humified compartments and inorganic forms in 6 very different ecosystems along an altitudinal transect. The microbial conversion of the 15N forms appeared to be strongly linked to that found previously 10 for 14C forms since the parameters and relationships defined for C were appropriate for modeling the N cycle. The only difference was in the flows between microbial and inorganic forms. The CO2-C loss was modeled using the equation for microbial respiration. Inorganic N appears also closely associated with microorganisms, which, depending on their C:N ratio and those of the available substrates, regulate the N mineralization 15 and immobilization processes. Applications at earth scale can use the approximation that the microbial C:N ratio does not vary with time, but for this study, microorganisms cannot be treated always as homeostatic as their C:N ratio can decrease during incubation and increase with altitude when C storage increases. The MOMOS model has been validated for the C cycle, and it also appears to be valid for microbial conversion 20 of N forms. It uses a relatively small number of well-defined, climate-dependent parameters, and it should fill a gap in the range of current models based on a direct microbial control for describing C and N flows in ecosystemses_VE
dc.language.isoenes_VE
dc.publisherBiogeosciences Discussions, 10(3): 5749-5780es_VE
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleModeling microbial exchanges between forms of soil nitrogen in contrasting ecosystemses_VE
dc.typeinfo:eu-repo/semantics/article
dc.description.colacion5749 - 5780es_VE
dc.description.emailmarc.pansu@ird.fres_VE
dc.description.emaildmachado@ula.ve, machadod@cantv.netes_VE
dc.description.emaillsarmien@ula.vees_VE
dc.publisher.paisUnión Europeaes_VE
dc.subject.facultadFacultad de Cienciases_VE
dc.subject.institucionUniversidad de Los Andeses_VE
dc.subject.thematiccategoryBiologíaes_VE
dc.subject.tipoArtículoses_VE
dc.subject.unidadinvInstituto de Ciencias Ambientales y Ecológicas (ICAE)es_VE
dc.type.mediaTextoes_VE


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