| ... | ... | @@ -22,38 +22,4 @@ Here is another wiki page about [Something Else](something-else) |
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- [ ] a task
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- [x] a completed task
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========================================
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# h1
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# N2O emission from nitrification
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"Parton et al. 1996":http://onlinelibrary.wiley.com/doi/10.1029/96GB01455/abstract gives function
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$`N_{N2O} = N_{H2O} \cdot N_{pH} \cdot N_T \cdot (Kmx + Nmx \cdot N_{NH4})`$
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with
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$N_{N2O} = ((WFPS-b)/(a-b))^{d\cdot (b-a)/(a-c)} \cdot ((WFPS-c)/(a-c))^d$
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* $WFPS$ is water filled pore space of the soil
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* parameters $a$ to $d$ given for sandy and medium soil
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* source for functions given as Doran et al. 1988
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$N_{pH} = 0.56+1/\pi\cdot \arctan(\pi\cdot 0.45 \cdot(pH-5))$
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* we ignore this limitation
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$N_T = -0.06+0.13\cdot \exp(0.07 \cdot T_{soil})$
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* based on data by Sabey et al. (1959)
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$Kmx = 0.00038$ gN m$^{-2}$ d$^{-1}$
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* N turnover coefficient
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* site specific but given for different sites
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* for natural soils given as 3.8 and 3.9 (gN ha$^{-1}$ d$^{-1}$)
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$Nmx = 0.003$ gN m$^{-2}$ d$^{-1}$
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* maximum nitrification flux of N$_2$O with excess NH$_4$.
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$N_{NH4} = 1 - \exp(-0.0105\cdot NH4)$
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* NH4 here given as $\mu$g N per g soil
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* in the same range as gN m$^{-2}$ so that formula taken as it is
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Process is incorporated in source:branches/nitrogen_rev2142/src/soil/littersom.c after mineralization. |
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\ No newline at end of file |
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======================================== |
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\ No newline at end of file |
