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DOI | 10.1002/ecy.2675 |
Constraining N cycling in the ecosystem model LandscapeDNDC with the stable isotope model SIMONE | |
Denk, Tobias R. A.; Kraus, David; Kiese, Ralf; Butterbach-Bahl, Klaus; Wolf, Benjamin | |
发表日期 | 2019 |
ISSN | 0012-9658 |
EISSN | 1939-9170 |
卷号 | 100期号:5 |
英文摘要 | The isotopic composition (ic) of soil nitrogen (N) and, more recently, the intramolecular distribution of N-15 in the N2O molecule (site preference, SP) are powerful instruments to identify dominant N turnover processes, and to attribute N2O 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 N-15-N2O and, to our knowledge for the first time, SP, to constrain simulated N fluxes by LandscapeDNDC. LandscapeDNDC successfully simulated N2O emission, soil nitrate, and ammonium, as well as soil environmental conditions of an intensively managed grassland site in Switzerland. Accordingly, the dynamics of N-15-N2O and SP of soil N2O fluxes as simulated by SIMONE agreed well with measurements, though N-15-N2O was on average underestimated and SP overestimated (root-mean-square error [RMSE] of 8.4& and 7.3&, respectively). Although N-15-N2O 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 N2O 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. |
WOS研究方向 | Environmental Sciences & Ecology |
来源期刊 | ECOLOGY
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/97473 |
作者单位 | Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Atmospher Environm Res IMK IFU, Kreuzeckbahnstr 19, D-82467 Garmisch Partenkirchen, Germany |
推荐引用方式 GB/T 7714 | Denk, Tobias R. A.,Kraus, David,Kiese, Ralf,et al. Constraining N cycling in the ecosystem model LandscapeDNDC with the stable isotope model SIMONE[J],2019,100(5). |
APA | Denk, Tobias R. A.,Kraus, David,Kiese, Ralf,Butterbach-Bahl, Klaus,&Wolf, Benjamin.(2019).Constraining N cycling in the ecosystem model LandscapeDNDC with the stable isotope model SIMONE.ECOLOGY,100(5). |
MLA | Denk, Tobias R. A.,et al."Constraining N cycling in the ecosystem model LandscapeDNDC with the stable isotope model SIMONE".ECOLOGY 100.5(2019). |
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