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• W2918245088 abstract "Abstract The isotopic composition (ic) of soil nitrogen (N) and, more recently, the intramolecular distribution of 15 N in the N 2 O molecule (site preference, SP) are powerful instruments to identify dominant N turnover processes, and to attribute N 2 O emissions to their source processes. Despite the process information contained in the ic of N species and the associated potential for model validation, the implementation of isotopes in ecosystem models has lagged behind. To foster the validation of ecosystem models based on the ic of N species, we developed the stable isotope model for nutrient cycles (SIMONE). SIMONE uses fluxes between ecosystem N pools (soil organic N, mineral N, plants, microbes) calculated by biogeochemical models, and literature isotope effects for these processes to calculate the ic of N species. Here, we present the concept of SIMONE, apply it to simulations of the biogeochemical model LandscapeDNDC, and assess the capability of 15 N‐N 2 O and, to our knowledge for the first time, SP, to constrain simulated N fluxes by LandscapeDNDC. LandscapeDNDC successfully simulated N 2 O emission, soil nitrate, and ammonium, as well as soil environmental conditions of an intensively managed grassland site in Switzerland. Accordingly, the dynamics of 15 N‐N 2 O and SP of soil N 2 O fluxes as simulated by SIMONE agreed well with measurements, though 15 N‐N 2 O was on average underestimated and SP overestimated (root‐mean‐square error [RMSE] of 8.4‰ and 7.3‰, respectively). Although 15 N‐N 2 O could not constrain the N cycling process descriptions of LandscapeDNDC, the overestimation of SP indicated an overestimation of simulated nitrification rates by 10–59% at low water content, suggesting the revision of the corresponding model parameterization. Our findings show that N isotope modeling in combination with only recently available high‐ frequency measurements of the N 2 O ic are promising tools to identify and address weaknesses in N cycling of ecosystem models. This will finally contribute to augmenting the development of model‐based strategies for mitigating N pollution." @default.
• W2918245088 created "2019-03-11" @default.
• W2918245088 creator A5011061423 @default.
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• W2918245088 creator A5091890079 @default.
• W2918245088 date "2019-04-18" @default.
• W2918245088 modified "2023-10-03" @default.
• W2918245088 title "Constraining N cycling in the ecosystem model LandscapeDNDC with the stable isotope model SIMONE" @default.
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• W2918245088 doi "https://doi.org/10.1002/ecy.2675" @default.
• W2918245088 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30821344" @default.
• W2918245088 hasPublicationYear "2019" @default.
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• W2918245088 hasAuthorship W2918245088A5011061423 @default.
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