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Nutrient controls on leaf level photosynthetic processes #768

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Nutrient controls on leaf level photosynthetic processes #768

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c630f8c
Adding in leafn and leafp effect on vcmax25top, vcmax25 parameters, n…
jenniferholm Jul 7, 2021
ccebaa7
Added c-only photosyn. jmax, vcmax in PARTEH case, and option for kp25
jenniferholm Aug 4, 2021
190e449
updated to most recent parameter file; reverted switches back to defa…
jenniferholm Aug 13, 2021
628c598
removed incorrect co2_rcurve_islope25top_ft calculation in photosynth…
jenniferholm Sep 23, 2021
47e8737
removed min/max caps on lnc and lpc and unused vcmaxse equation
jenniferholm Jan 24, 2022
8ccae78
Removed unused testing lines
jenniferholm Mar 30, 2022
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2 changes: 1 addition & 1 deletion biogeochem/FatesSoilBGCFluxMod.F90
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Expand Up @@ -1182,7 +1182,7 @@ function ECACScalar(ccohort, element_id) result(c_scalar)
integer, parameter :: downreg_logi = 2
integer, parameter :: downreg_CN_logi = 3

integer, parameter :: downreg_type = downreg_linear
integer, parameter :: downreg_type = downreg_CN_logi
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real(r8), parameter :: logi_k = 25.0_r8 ! logistic function k
Expand Down
121 changes: 96 additions & 25 deletions biogeophys/FatesPlantRespPhotosynthMod.F90
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Expand Up @@ -40,6 +40,7 @@ module FATESPlantRespPhotosynthMod
use PRTGenericMod, only : prt_cnp_flex_allom_hyp
use PRTGenericMod, only : all_carbon_elements
use PRTGenericMod, only : nitrogen_element
use PRTGenericMod, only : phosphorus_element
use PRTGenericMod, only : leaf_organ
use PRTGenericMod, only : fnrt_organ
use PRTGenericMod, only : sapw_organ
Expand Down Expand Up @@ -161,6 +162,10 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
! (umol electrons/m**2/s)
real(r8) :: kp_z ! leaf layer initial slope of CO2 response
! curve (C4 plants)
real(r8) :: vcmax25top_prt ! canopy top: variable maximum rate of carboxylation at 25C for parteh
! (umol CO2/m**2/s)
real(r8) :: jmax25top_prt ! canopy top: variable maximum electron transport rate at 25C for parteh
! (umol electrons/m**2/s)
real(r8) :: c13disc_z(nclmax,maxpft,nlevleaf) ! carbon 13 in newly assimilated carbon at leaf level

real(r8) :: mm_kco2 ! Michaelis-Menten constant for CO2 (Pa)
Expand All @@ -169,10 +174,12 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
real(r8) :: btran_eff ! effective transpiration wetness factor (0 to 1)
real(r8) :: stomatal_intercept_btran ! water-stressed minimum stomatal conductance (umol H2O/m**2/s)
real(r8) :: kn ! leaf nitrogen decay coefficient
real(r8) :: kn_prt ! leaf nitrogen decay coefficient based on variable vcmax25top_prt
real(r8) :: cf ! s m**2/umol -> s/m (ideal gas conversion) [umol/m3]
real(r8) :: gb_mol ! leaf boundary layer conductance (molar form: [umol /m**2/s])
real(r8) :: ceair ! vapor pressure of air, constrained (Pa)
real(r8) :: nscaler ! leaf nitrogen scaling coefficient
real(r8) :: nscaler_prt ! leaf nitrogen scaling coefficient based on variable vcmax25top_prt
real(r8) :: leaf_frac ! ratio of to leaf biomass to total alive biomass
real(r8) :: tcsoi ! Temperature response function for root respiration.
real(r8) :: tcwood ! Temperature response function for wood
Expand All @@ -188,6 +195,7 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
real(r8) :: fnrt_n ! Fine root nitrogen content (kgN/plant)
real(r8) :: leaf_c ! Leaf carbon (kgC/plant)
real(r8) :: leaf_n ! leaf nitrogen content (kgN/plant)
real(r8) :: leaf_p ! leaf phosphorus (kgP/plant)
real(r8) :: g_sb_leaves ! Mean combined (stomata+boundary layer) leaf conductance [m/s]
! over all of the patch's leaves. The "sb" refers to the combined
! "s"tomatal and "b"oundary layer.
Expand All @@ -206,6 +214,10 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
! over each cohort x layer.
real(r8) :: cohort_eleaf_area ! This is the effective leaf area [m2] reported by each cohort
real(r8) :: lnc_top ! Leaf nitrogen content per unit area at canopy top [gN/m2]
real(r8) :: lpc_top ! Leaf phosphorus content per unit area at canopy top [gP/m2]
real(r8) :: jmax_np1 ! jmax~np relationship coefficient
real(r8) :: jmax_np2 ! jmax~np relationship coefficient
real(r8) :: jmax_np3 ! jmax~np relationship coefficient
Comment on lines +220 to +222
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can we add units for each of these?

real(r8) :: lmr25top ! canopy top leaf maint resp rate at 25C
! for this plant or pft (umol CO2/m**2/s)
real(r8) :: leaf_inc ! LAI-only portion of the vegetation increment of dinc_ed
Expand Down Expand Up @@ -251,8 +263,17 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
slatop => prt_params%slatop , & ! specific leaf area at top of canopy,
! projected area basis [m^2/gC]
woody => prt_params%woody, & ! Is vegetation woody or not?
stomatal_intercept => EDPftvarcon_inst%stomatal_intercept ) !Unstressed minimum stomatal conductance

stomatal_intercept => EDPftvarcon_inst%stomatal_intercept, & !Unstressed minimum stomatal conductance
vcmax_np1 => EDPftvarcon_inst%vcmax_np1, & !vcmax~np relationship coefficient
vcmax_np2 => EDPftvarcon_inst%vcmax_np2, & !vcmax~np relationship coefficient
vcmax_np3 => EDPftvarcon_inst%vcmax_np3, & !vcmax~np relationship coefficient
vcmax_np4 => EDPftvarcon_inst%vcmax_np4 ) !vcmax~np relationship coefficient

! jmax~np relationship coefficients needed in the parteh calculation of
! variable jmax25top_prt
jmax_np1 = 1.246_r8
jmax_np2 = 0.886_r8
jmax_np3 = 0.089_r8

do s = 1,nsites

Expand Down Expand Up @@ -434,24 +455,8 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
btran_eff = btran_eff*currentPatch%bstress_sal_ft(ft)
endif


! Bonan et al (2011) JGR, 116, doi:10.1029/2010JG001593 used
! kn = 0.11. Here, derive kn from vcmax25 as in Lloyd et al
! (2010) Biogeosciences, 7, 1833-1859

kn = decay_coeff_kn(ft,currentCohort%vcmax25top)

! Scale for leaf nitrogen profile
nscaler = exp(-kn * cumulative_lai)

! Leaf maintenance respiration to match the base rate used in CN
! but with the new temperature functions for C3 and C4 plants.

! CN respiration has units: g C / g N [leaf] / s. This needs to be
! converted from g C / g N [leaf] / s to umol CO2 / m**2 [leaf] / s

! Then scale this value at the top of the canopy for canopy depth
! Leaf nitrogen concentration at the top of the canopy (g N leaf / m**2 leaf)

! Leaf nutrient concentrations at the top of the canopy (g N leaf / m**2 leaf)
select case(hlm_parteh_mode)
case (prt_carbon_allom_hyp)

Expand All @@ -462,20 +467,52 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
leaf_c = currentCohort%prt%GetState(leaf_organ, all_carbon_elements)
if( (leaf_c*slatop(ft)) > nearzero) then
leaf_n = currentCohort%prt%GetState(leaf_organ, nitrogen_element)
leaf_p = currentCohort%prt%GetState(leaf_organ, phosphorus_element)
lnc_top = leaf_n / (slatop(ft) * leaf_c )
lpc_top = leaf_p / (slatop(ft) * leaf_c )
! lnc_top = leaf_n / currentPatch%tlai_profile(cl,ft,iv)
! lpc_top = leaf_p / currentPatch%tlai_profile(cl,ft,iv)
lnc_top = min(max(lnc_top,0.25_r8),3.0_r8) !based on doi: 10.1002/ece3.1173
lpc_top = min(max(lpc_top,0.014_r8),0.85_r8) !based on doi: 10.1002/ece3.1173
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else
lnc_top = prt_params%nitr_stoich_p1(ft,prt_params%organ_param_id(leaf_organ))/slatop(ft)
lnc_top = prt_params%nitr_stoich_p1(ft,prt_params%organ_param_id(leaf_organ))/slatop(ft)
lpc_top = prt_params%phos_stoich_p1(ft,prt_params%organ_param_id(leaf_organ))/slatop(ft)
end if

! If one wants to break coupling with dynamic N conentrations,
! use the stoichiometry parameter
! lnc_top = prt_params%nitr_stoich_p1(ft,prt_params%organ_param_id(leaf_organ))/slatop(ft)

vcmax25top_prt = exp(vcmax_np1(ft) + vcmax_np2(ft)*log(lnc_top) + &
vcmax_np3(ft)*log(lpc_top) + vcmax_np4(ft)*log(lnc_top)*log(lpc_top))
jmax25top_prt = exp(jmax_np1 + jmax_np2*log(vcmax25top_prt) + jmax_np3*log(lpc_top))
vcmax25top_prt = min(max(vcmax25top_prt, 10.0_r8), 150.0_r8)
jmax25top_prt = min(max(jmax25top_prt, 10.0_r8), 250.0_r8)
Comment on lines +500 to +501
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what is the source of these numbers?


kn_prt = decay_coeff_kn(ft,vcmax25top_prt)
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are the kn_prt and nscaler_prt variables used @jenniferholm ? Should we remove these?

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Do you consider multi-layer canopy here? If so, the lnc_top, lpc_top calculation needs to consider the vertical distribution of leaf N by applying nscaler_prt term. If not, I think the nscaler_prt should be always one. @jenniferholm

nscaler_prt = exp(-kn_prt * cumulative_lai)

end select

lmr25top = 2.525e-6_r8 * (1.5_r8 ** ((25._r8 - 20._r8)/10._r8))
lmr25top = lmr25top * lnc_top / (umolC_to_kgC * g_per_kg)

! Bonan et al (2011) JGR, 116, doi:10.1029/2010JG001593 used
! kn = 0.11. Here, derive kn from vcmax25 as in Lloyd et al
! (2010) Biogeosciences, 7, 1833-1859

kn = decay_coeff_kn(ft,currentCohort%vcmax25top)
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or, alternative to my above comment, should we remove these and pass nscaler_prt into LeafLayerMaintenanceRespiration() ?

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I'd be a little cautious about creating these extra _prt parameters that are conceptually the same trait, just calculated differently. We had some similar discussion wrt gs traits 616 and decided to not proliferate variables when they are the same. We stuck with a single g0 as it's conceptually the same in BB and Medlyn models but different g1 because the two models mean that g1 has a different effect and so is conceptually slightly different.

I would suggest doing that for all variables labelled _prt, but especially these nscalar and kn given that they are essentially calculated in the same way. Couldn't we have a case statement for the calculation of kn (would be unnecessary if both Vcmax's were labeled the same way) and then just a single calculation of nscalar ?


! Scale for leaf nitrogen profile
nscaler = exp(-kn * cumulative_lai)

! Leaf maintenance respiration to match the base rate used in CN
! but with the new temperature functions for C3 and C4 plants.

! CN respiration has units: g C / g N [leaf] / s. This needs to be
! converted from g C / g N [leaf] / s to umol CO2 / m**2 [leaf] / s

! Then scale this value at the top of the canopy for canopy depth

! Part VII: Calculate dark respiration (leaf maintenance) for this layer
call LeafLayerMaintenanceRespiration( lmr25top, & ! in
Expand All @@ -501,8 +538,12 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)
currentCohort%vcmax25top, & ! in
currentCohort%jmax25top, & ! in
currentCohort%kp25top, & ! in
vcmax25top_prt, & ! in
jmax25top_prt, & ! in
nscaler, & ! in
nscaler_prt, & ! in
bc_in(s)%t_veg_pa(ifp), & ! in
bc_in(s)%dayl_factor_pa(ifp), & ! in
btran_eff, & ! in
vcmax_z, & ! out
jmax_z, & ! out
Expand Down Expand Up @@ -542,7 +583,7 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)

rate_mask_z(iv,ft,cl) = .true.
end if
end do
end do !leaf-layer loop

! Zero cohort flux accumulators.
currentCohort%npp_tstep = 0.0_r8
Expand Down Expand Up @@ -815,7 +856,7 @@ subroutine FatesPlantRespPhotosynthDrive (nsites, sites,bc_in,bc_out,dtime)

currentPatch => currentPatch%younger

end do
end do !patch loop

deallocate(rootfr_ft)

Expand Down Expand Up @@ -1813,8 +1854,12 @@ subroutine LeafLayerBiophysicalRates( parsun_lsl, &
vcmax25top_ft, &
jmax25top_ft, &
co2_rcurve_islope25top_ft, &
vcmax25top_prt_ft, &
jmax25top_prt_ft, &
nscaler, &
nscaler_prt, &
veg_tempk, &
dayl_factor, &
btran, &
vcmax, &
jmax, &
Expand Down Expand Up @@ -1842,14 +1887,20 @@ subroutine LeafLayerBiophysicalRates( parsun_lsl, &
real(r8), intent(in) :: parsun_lsl ! PAR absorbed in sunlit leaves for this layer
integer, intent(in) :: ft ! (plant) Functional Type Index
real(r8), intent(in) :: nscaler ! Scale for leaf nitrogen profile
real(r8), intent(in) :: nscaler_prt ! Scale for leaf nitrogen profile based on variable vcmax25top_prt
real(r8), intent(in) :: vcmax25top_ft ! canopy top maximum rate of carboxylation at 25C
! for this pft (umol CO2/m**2/s)
real(r8), intent(in) :: jmax25top_ft ! canopy top maximum electron transport rate at 25C
! for this pft (umol electrons/m**2/s)
real(r8), intent(in) :: co2_rcurve_islope25top_ft ! initial slope of CO2 response curve
! (C4 plants) at 25C, canopy top, this pft
real(r8), intent(in) :: veg_tempk ! vegetation temperature
real(r8), intent(in) :: btran ! transpiration wetness factor (0 to 1)
real(r8), intent(in) :: vcmax25top_prt_ft ! canopy top maximum rate of carboxylation at 25C for parteh
! for this pft (umol CO2/m**2/s)
real(r8), intent(in) :: jmax25top_prt_ft ! canopy top maximum electron transport rate at 25C for parteh
! for this pft (umol CO2/m**2/s)
real(r8), intent(in) :: veg_tempk ! vegetation temperature
real(r8), intent(in) :: dayl_factor ! daylength scaling factor (0-1)
real(r8), intent(in) :: btran ! transpiration wetness factor (0 to 1)

real(r8), intent(out) :: vcmax ! maximum rate of carboxylation (umol co2/m**2/s)
real(r8), intent(out) :: jmax ! maximum electron transport rate
Expand Down Expand Up @@ -1885,6 +1936,8 @@ subroutine LeafLayerBiophysicalRates( parsun_lsl, &

vcmaxse = EDPftvarcon_inst%vcmaxse(FT)
jmaxse = EDPftvarcon_inst%jmaxse(FT)
!vcmaxse = 668.39_r8 - 1.07_r8 * min(max((temp_a10-tfrz),11._r8),35._r8) !Kattge & Knorr 2007
!jmaxse = 659.70_r8 - 0.75_r8 * min(max((temp_a10-tfrz),11._r8),35._r8) !Kattge & Knorr 2007
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vcmaxc = fth25_f(vcmaxhd, vcmaxse)
jmaxc = fth25_f(jmaxhd, jmaxse)
Expand All @@ -1895,11 +1948,29 @@ subroutine LeafLayerBiophysicalRates( parsun_lsl, &
co2_rcurve_islope = 0._r8
else ! day time

select case(hlm_parteh_mode)
case (prt_carbon_allom_hyp)
!vcmax25top_ft = lnc_top * flnr * fnr * act25 * dayl_factor
!jmax25top_ft = (2.59_r8 - 0.035_r8*min(max((temp_a10-tfrz),11._r8),35._r8)) * vcmax25top_ft

case (prt_cnp_flex_allom_hyp)

! Using the newly calculated top of the canopy vcmax and jmax, not the parameter file values
vcmax25 = vcmax25top_prt_ft * dayl_factor * nscaler_prt
jmax25 = jmax25top_prt_ft * dayl_factor * nscaler_prt

end select


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Similar comment to above here. This could all be simplified if the _prt suffix was removed.

! Vcmax25top was already calculated to derive the nscaler function
vcmax25 = vcmax25top_ft * nscaler
jmax25 = jmax25top_ft * nscaler
co2_rcurve_islope25 = co2_rcurve_islope25top_ft * nscaler

print*,"vcmax25top, vcmax25top_prt, vcmax25: ",vcmax25top_ft,vcmax25top_prt_ft,vcmax25
print*,"nscaler, nscaler_prt, day_length : ",nscaler,nscaler_prt,dayl_factor
print*,"jmax25top, jmax25top_prt, jmax25: ",jmax25top_ft,jmax25top_prt_ft,jmax25

! Adjust for temperature
vcmax = vcmax25 * ft1_f(veg_tempk, vcmaxha) * fth_f(veg_tempk, vcmaxhd, vcmaxse, vcmaxc)
jmax = jmax25 * ft1_f(veg_tempk, jmaxha) * fth_f(veg_tempk, jmaxhd, jmaxse, jmaxc)
Expand Down
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