Evaluation and adjustment of description of denitrification in the DailyDayCent and COUP models based on N2 and N2O laboratory incubation system measurements

München

2017

Sonderdruck

12217S

202735

Denitrification is an anaerobic key process by microbes where the NO􀀀 3 is step-by-step reduced and emitted as NO, N2O and finally N2 gas from the soil. The accurate knowledge of the reduction of nitrate (NO􀀀 3 ) and nitrite (NO􀀀 2 ) to N2O and molecular N2 is important because the N2O fraction is further reduced to N2 and constitutes the main emission source of this greenhouse gas from agricultural soils. Hence, our understanding and ability to quantify soil denitrification is crucial for mitigating nitrogen fertilizer loss as well as for reducing N2O emissions. Models can be an important tool to predict mitigation effects and help to develop climate smart mitigation strategies.