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. A group of soil microbes plays an important role in nitrogencycling and N2O emissions from natural ecosystem soils. Wedeveloped a trait-based biogeochemical model based on an extant process-basedbiogeochemistry model, the Terrestrial Ecosystem Model (TEM), byincorporating the detailed microbial physiological processes ofnitrification. The effect of ammonia-oxidizing Archaea (AOA),ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB) wasconsidered in modeling nitrification. Microbial traits, includingmicrobial biomass and density, were explicitly considered. In addition,nitrogen cycling was coupled with carbon dynamics based on stoichiometrytheory between carbon and nitrogen. The model was parameterized usingobservational data and then applied to quantifying global N2O emissions from global terrestrial ecosystem soils from 1990 to 2000. Ourestimates of 8.7±1.6  Tg N yr −1 generally agreed with previousestimates during the study period. Tropical forests are a major emitter,accounting for 42 % of the global emissions. The model was more sensitiveto temperature and precipitation and less sensitive to soil organic carbonand nitrogen contents. Compared to the model without considering the detailedmicrobial activities, the new model shows more variations in response toseasonal changes in climate. Our study suggests that further information onmicrobial diversity and ecophysiology features is needed. The more specificguilds and their traits shall be considered in future soil N2O emission quantifications.

Quantifying global N&lt;sub&gt;2&lt;/sub&gt;O emissions from natural ecosystem soils using trait-based biogeochemistry models

Quantifying global N<sub>2</sub>O emissions from natural ecosystem soils using trait-based biogeochemistry models