| 52 | | * '''denitrifier bacterial population change'''. This is based on Eq. 3 of Table 4 Li et al. (2000). In OCN, there is only the denitrifier bact population change that is defined, not the population itself. And the bacterial population change is used in place of the bacterial population in the calculation of the production of NO3, NOx, N2O by denitrification. [source:branches/orchidee-N/ORCHIDEE/src_stomate/stomate_soilcarbon.f90@19#L845 here]. I don't know how it may work |
| | 52 | * '''denitrifier bacterial population change'''. This is based on Eq. 3 of Table 4 Li et al. (2000). In OCN, there is only the denitrifier bact population change that is defined, not the population itself. And the bacterial population change is used in place of the bacterial population in the calculation of the production of NO3, NOx, N2O by denitrification. [source:branches/orchidee-N/ORCHIDEE/src_stomate/stomate_soilcarbon.f90@19#L845 here]. I don't know how it may work. |
| | 53 | |
| | 54 | * '''Vmax of nitrogen uptake by plants'''. In OCN, the same values are used both for uptake of NH4+ and NO3-. See p. 3 of the SM of Zaehle & Friend, 2010: "''As a first approximation average values for vmax, kNmin and KNmin are assumed for all PFTs (Table S1), and for both ammonium and nitrate''". However based on the two papers of Kronzucker et al. (1995, 1996), it seems that vmax should be much higher for NH4+ than for NO3- . We still use the same here for both NH4+ and NO3- as in OCN. |
| | 55 | |
| | 56 | * '''Vmax of nitrogen uptake by plants''' (2). I can not relate the value of vmax in OCN expressed in (umol (g DryWeight_root)-1 h-1) (vmax=3 [source:branches/orchidee-N/ORCHIDEE/src_stomate/stomate_soilcarbon.f90@19#L595 here]) to the one reported in Table S1 of Zaehle & Friend, 2010 (vmax=5.14 ugN (g-1C) d-1). The use of the conv_fac conversion factor used in OCN ([source:branches/orchidee-N/ORCHIDEE/src_stomate/stomate_soilcarbon.f90@19#L869 here]) should help to convert (umol (g dryWeight_root)-1 h-1) in (gN (g-1C) tstep-1). conv_fac is defined as 24. * dt / 2. / 1000000. * 14 with: |
| | 57 | - 24 conversion of hour to day |
| | 58 | - dt conversion of day to dt |
| | 59 | - 1/2 conversion of g(DryWeight) to gC |
| | 60 | - 1000000. conversion of ug to g |
| | 61 | - 14 conversion of umol to ugN |
| | 62 | So using conv_fac, vmax expressed in ugN (g-1C) d-1 should be equal to 3*24./2.*14. = 504 ugN (gC)-1 d-1 not 5.14 |
| | 63 | |
| | 64 | * '''Vmax of nitrogen uptake by plants''' (2). |
