...  @@ 18,4 +18,38 @@ Here is another wiki page about [Something Else](somethingelse) 
...  @@ 18,4 +18,38 @@ Here is another wiki page about [Something Else](somethingelse) 





# Another heading


# Another heading


 [ ] a task


 [ ] a task


 [x] a completed task 

 [x] a completed task


\ No newline at end of file 





========================================








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. 



\ No newline at end of file 