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# h1






# N2O emission from nitrification






"Parton et al. 1996":http://onlinelibrary.wiley.com/doi/10.1029/96GB01455/abstract gives function






$`N_{N2O} = N_{H2O} \cdot N_{pH} \cdot N_T \cdot (Kmx + Nmx \cdot N_{NH4})`$






with



$N_{N2O} = ((WFPSb)/(ab))^{d\cdot (ba)/(ac)} \cdot ((WFPSc)/(ac))^d$



* $WFPS$ is water filled pore space of the soil



* parameters $a$ to $d$ given for sandy and medium soil



* source for functions given as Doran et al. 1988






$N_{pH} = 0.56+1/\pi\cdot \arctan(\pi\cdot 0.45 \cdot(pH5))$



* we ignore this limitation






$N_T = 0.06+0.13\cdot \exp(0.07 \cdot T_{soil})$



* based on data by Sabey et al. (1959)






$Kmx = 0.00038$ gN m$^{2}$ d$^{1}$



* N turnover coefficient



* site specific but given for different sites



* for natural soils given as 3.8 and 3.9 (gN ha$^{1}$ d$^{1}$)






$Nmx = 0.003$ gN m$^{2}$ d$^{1}$



* maximum nitrification flux of N$_2$O with excess NH$_4$.






$N_{NH4} = 1  \exp(0.0105\cdot NH4)$



* NH4 here given as $\mu$g N per g soil



* in the same range as gN m$^{2}$ so that formula taken as it is






Process is incorporated in source:branches/nitrogen_rev2142/src/soil/littersom.c after mineralization. 


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