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graze.f
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subroutine graze
!! ~ ~ ~ PURPOSE ~ ~ ~
!! this subroutine simulates biomass lost to grazing
!! ~ ~ ~ INCOMING VARIABLES ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! bactkddb(:) |none |bacteria partition coefficient:
!! |1: all bacteria in solution
!! |0: all bacteria sorbed to soil particles
!! bactlp_plt(:)|# cfu/m^2 |less persistent bacteria on foliage
!! bactlpdb(:) |# cfu/g |concentration of less persistent
!! |bacteria in manure(fertilizer)
!! bactlpq(:) |# cfu/m^2 |less persistent bacteria in soil solution
!! bactlps(:) |# cfu/m^2 |less persistent bacteria attached to soil
!! |particles
!! bactp_plt(:) |# cfu/m^2 |persistent bacteria on foliage
!! bactpdb(:) |# cfu/g |concentration of persistent bacteria
!! |in manure(fertilizer)
!! bactpq(:) |# cfu/m^2 |persistent bacteria in soil solution
!! bactps(:) |# cfu/m^2 |persistent bacteria attached to soil particles
!! bio_min(:) |kg/ha |minimum plant biomass for grazing
!! bio_ms(:) |kg/ha |land cover/crop biomass (dry weight)
!! bio_eat(:) |(kg/ha)/day |dry weight of biomass removed by grazing
!! |daily
!! bio_trmp(:) |(kg/ha)/day |dry weight of biomass removed by
!! |trampling daily
!! curyr |none |current year of simulation
!! fminn(:) |kg minN/kg frt|fraction of mineral N (NO3 + NH3) in
!! |fertilizer/manure
!! fminp(:) |kg minP/kg frt|fraction of mineral P in fertilizer/manure
!! fnh3n(:) |kg NH3-N/kg minN|fraction of NH3-N in mineral N in
!! |fertilizer/manure
!! forgn(:) |kg orgN/kg frt|fraction of organic N in fertilizer/manure
!! forgp(:) |kg orgP/kg frt|fraction of organic P in fertilizer/manure
!! grazn |kg N/ha |total amount of nitrogen applied to soil
!! |during grazing in HRU on day
!! grazp |kg P/ha |total amount of phosphorus applied to soil
!! |during grazing in HRU on day
!! hru_dafr(:) |km**2/km**2 |fraction of watershed area in HRU
!! icr(:) |none |sequence number of crop grown within the
!! |current year
!! iida |julian date |day being simulated (current julian day
!! manure_id(:) |none |manure (fertilizer) identification
!! |number from fert.dat
!! igrz(:) |none |grazing flag for HRU:
!! |0 HRU currently not grazed
!! |1 HRU currently grazed
!! ihru |none |HRU number
!! laiday(:) |m**2/m**2 |leaf area index
!! grz_days(:) |none |number of days grazing will be simulated
!! ngr(:) |none |sequence number of grazing operation
!! |within the year
!! nro(:) |none |sequence number of year in rotation
!! nyskip |none |number of years to skip output summarization
!! |and printing
!! phuacc(:) |none |fraction of plant heat units accumulated
!! phug(:,:,:) |none |fraction of plant heat units at which
!! |grazing begins
!! plantn(:) |kg N/ha |amount of nitrogen in plant
!! plantp(:) |kg P/ha |amount of phosphorus in plant
!! pltfr_n(:) |none |fraction of plant biomass that is nitrogen
!! pltfr_p(:) |none |fraction of plant biomass that is phosphorus
!! sol_bd(:,:) |Mg/m**3 |bulk density of the soil
!! sol_fon(:,:) |kg N/ha |amount of nitrogen stored in the fresh
!! |organic (residue) pool
!! sol_fop(:,:) |kg P/ha |amount of phosphorus stored in the fresh
!! |organic (residue) pool
!! sol_nh3(:,:) |kg N/ha |amount of nitrogen stored in the ammonium
!! |pool in soil layer
!! sol_no3(:,:) |kg N/ha |amount of nitrogen stored in the nitrate pool
!! |in soil layer
!! sol_rsd(:,:) |kg/ha |amount of organic matter in the soil
!! |classified as residue
!! sol_solp(:,:)|kg P/ha |amount of phosohorus stored in solution
!! sol_z(:,:) |mm |depth to bottom of soil layer
!! manure_kg(:) |(kg/ha)/day |dry weight of manure deposited on HRU
!! |daily
!! wshd_fminp |kg P/ha |average annual amount of mineral P applied
!! |in watershed
!! wshd_fnh3 |kg N/ha |average annual amount of NH3-N applied in
!! |watershed
!! wshd_fno3 |kg N/ha |average annual amount of NO3-N applied in
!! |watershed
!! wshd_orgn |kg N/ha |average annual amount of organic N applied
!! |in watershed
!! wshd_orgp |kg P/ha |average annual amount of organic P applied
!! |in watershed
!! wshd_ftotn |kg N/ha |average annual amount of N (mineral &
!! |organic) applied in watershed
!! wshd_ftotp |kg P/ha |average annual amount of P (mineral &
!! |organic) applied in watershed
!! yldkg(:,:,:) |kg/ha |yield (dry weight) by crop type in the HRU
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ OUTGOING VARIABLES ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! bactlp_plt(:)|# cfu/m^2 |less persistent bacteria on foliage
!! bactlpq(:) |# cfu/m^2 |less persistent bacteria in soil solution
!! bactlps(:) |# cfu/m^2 |less persistent bacteria attached to soil
!! |particles
!! bactp_plt(:)|# cfu/m^2 |persistent bacteria on foliage
!! bactpq(:) |# cfu/m^2 |persistent bacteria in soil solution
!! bactps(:) |# cfu/m^2 |persistent bacteria attached to soil particles
!! bio_ms(:) |kg/ha |land cover/crop biomass (dry weight)
!! grazn |kg N/ha |total amount of nitrogen applied to soil
!! |during grazing in HRU on day
!! grazp |kg P/ha |total amount of phosphorus applied to soil
!! |during grazing in HRU on day
!! igrz(:) |none |grazing flag for HRU:
!! |0 HRU currently not grazed
!! |1 HRU currently grazed
!! laiday(:) |m**2/m**2 |leaf area index
!! ndeat(:) |days |number of days HRU has been grazed
!! ngr(:) |none |sequence number of grazing operation
!! |within the year
!! phuacc(:) |none |fraction of plant heat units accumulated
!! plantn(:) |kg N/ha |amount of nitrogen in plant
!! plantp(:) |kg P/ha |amount of phosphorus in plant
!! sol_fon(:,:)|kg N/ha |amount of nitrogen stored in the fresh
!! |organic (residue) pool
!! sol_fop(:,:)|kg P/ha |amount of phosphorus stored in the fresh
!! |organic (residue) pool
!! sol_nh3(:,:)|kg N/ha |amount of nitrogen stored in the ammonium
!! |pool in soil layer
!! sol_no3(:,:)|kg N/ha |amount of nitrogen stored in the nitrate pool
!! |in soil layer
!! sol_rsd(:,:)|kg/ha |amount of organic matter in the soil
!! |classified as residue
!! sol_solp(:,:)|kg P/ha |amount of phosohorus stored in solution
!! wshd_fminp |kg P/ha |average annual amount of mineral P applied
!! |in watershed
!! wshd_fnh3 |kg N/ha |average annual amount of NH3-N applied in
!! |watershed
!! wshd_fno3 |kg N/ha |average annual amount of NO3-N applied in
!! |watershed
!! wshd_orgn |kg N/ha |average annual amount of organic N applied
!! |in watershed
!! wshd_orgp |kg P/ha |average annual amount of organic P applied
!! |in watershed
!! wshd_ftotn |kg N/ha |average annual amount of N (mineral &
!! |organic) applied in watershed
!! wshd_ftotp |kg P/ha |average annual amount of P (mineral &
!! |organic) applied in watershed
!! yldkg(:,:,:)|kg/ha |yield (dry weight) by crop type in the HRU
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ LOCAL DEFINITIONS ~ ~ ~
!! name |units |definition
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! dmi |kg/ha |biomass in HRU prior to grazing
!! dmii |kg/ha |biomass prior to trampling
!! frt_t |
!! gc |
!! gc1 |
!! it |none |manure/fertilizer id number from fert.dat
!! j |none |HRU number
!! l |none |number of soil layer that manure is applied
!! swf |
!! xx |
!! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
!! ~ ~ ~ SUBROUTINES/FUNCTIONS CALLED ~ ~ ~
!! Intrinsic: Max
!! SWAT: Erfc
!! ~ ~ ~ ~ ~ ~ END SPECIFICATIONS ~ ~ ~ ~ ~ ~
use parm
integer :: j, l, it
real :: dmi, dmii, gc, gc1, swf, frt_t, xx
j = 0
j = ihru
!! graze only if adequate biomass in HRU
if (bio_ms(j) > bio_min(j)) then
!! determine new biomass in HRU
dmi = 0.
dmi = bio_ms(j)
bio_ms(j) = bio_ms(j) - bio_eat(j)
if (bio_ms(j) < bio_min(j)) bio_ms(j) = bio_min(j)
!!add by zhang
!!=================
if (cswat == 2) then
emitc_d(j) = emitc_d(j) + dmi - bio_ms(j)
end if
!!add by zhang
!!=================
!! adjust nutrient content of biomass
plantn(j) = plantn(j) - (dmi - bio_ms(j)) * pltfr_n(j)
plantp(j) = plantp(j) - (dmi - bio_ms(j)) * pltfr_p(j)
if (plantn(j) < 0.) plantn(j) = 0.
if (plantp(j) < 0.) plantp(j) = 0.
!! remove trampled biomass and add to residue
dmii = 0.
dmii = bio_ms(j)
bio_ms(j) = bio_ms(j) - bio_trmp(j)
if (bio_ms(j) < bio_min(j)) then
sol_rsd(1,j) = sol_rsd(1,j) + dmii - bio_min(j)
bio_ms(j) = bio_min(j)
!!add by zhang
!!=================
if (cswat == 2) then
rsdc_d(j) = rsdc_d(j) + dmii - bio_ms(j)
end if
!!add by zhang
!!=================
else
sol_rsd(1,j) = sol_rsd(1,j) + bio_trmp(j)
!!add by zhang
!!=================
if (cswat == 2) then
rsdc_d(j) = rsdc_d(j) + bio_trmp(j)
end if
!!add by zhang
!!=================
endif
sol_rsd(1,j) = Max(sol_rsd(1,j),0.)
bio_ms(j) = Max(bio_ms(j),0.)
!! adjust nutrient content of residue and biomass for
!! trampling
plantn(j) = plantn(j) - (dmii - bio_ms(j)) * pltfr_n(j)
plantp(j) = plantp(j) - (dmii - bio_ms(j)) * pltfr_p(j)
if (plantn(j) < 0.) plantn(j) = 0.
if (plantp(j) < 0.) plantp(j) = 0.
if (dmii - bio_ms(j) > 0.) then
sol_fon(1,j) = (dmii - bio_ms(j)) * pltfr_n(j) + sol_fon(1,j)
!!insert new biomss by zhang
!!===========================
if (cswat == 2) then
!!all the lignin from STD is assigned to LSL,
!!add STDL calculation
!!
!sol_LSL(k,ihru) = sol_STDL(k,ihru)
!CLG=BLG(3,JJK)*HUI(JJK)/(HUI(JJK)+EXP(BLG(1,JJK)-BLG(2,JJK)*&HUI(JJK))
! 52 BLG1 = LIGNIN FRACTION IN PLANT AT .5 MATURITY
! 53 BLG2 = LIGNIN FRACTION IN PLANT AT MATURITY
!CROPCOM.dat BLG1 = 0.01 BLG2 = 0.10
!SUBROUTINE ASCRV(X1,X2,X3,X4)
!EPIC0810
!THIS SUBPROGRAM COMPUTES S CURVE PARMS GIVEN 2 (X,Y) POINTS.
!USE PARM
!XX=LOG(X3/X1-X3)
!X2=(XX-LOG(X4/X2-X4))/(X4-X3)
!X1=XX+X3*X2
!RETURN
!END
!HUI(JJK)=HU(JJK)/XPHU
BLG1 = 0.01/0.10
BLG2 = 0.99
BLG3 = 0.10
XXX = log(0.5/BLG1-0.5)
BLG2 = (XXX -log(1./BLG2-1.))/(1.-0.5)
BLG1 = XXX + 0.5*BLG2
CLG=BLG3*phuacc(j)/(phuacc(j)+
& EXP(BLG1-BLG2*phuacc(j)))
!if (k == 1) then
sf = 0.05
!else
!sf = 0.1
!end if
!kg/ha
sol_min_n = 0.
sol_min_n = (sol_no3(1,j)+sol_nh3(1,j))
resnew = (dmii - bio_ms(j))
resnew_n = (dmii - bio_ms(j)) * pltfr_n(j)
resnew_ne = resnew_n + sf * sol_min_n
!Not sure 1000 should be here or not!
!RLN = 1000*(resnew * CLG/(resnew_n+1.E-5))
RLN = (resnew * CLG/(resnew_n+1.E-5))
RLR = MIN(.8, resnew * CLG/1000/(resnew/1000+1.E-5))
LMF = 0.85 - 0.018 * RLN
if (LMF <0.01) then
LMF = 0.01
else
if (LMF >0.7) then
LMF = 0.7
end if
end if
!if ((resnew * CLG/(resnew_n+1.E-5)) < 47.22) then
! LMF = 0.85 - 0.018 * (resnew * CLG/(resnew_n+1.E-5))
!else
! LMF = 0.
!end if
LSF = 1 - LMF
sol_LM(1,j) = sol_LM(1,j) + LMF * resnew
sol_LS(1,j) = sol_LS(1,j) + LSF * resnew
!here a simplified assumption of 0.5 LSL
!LSLF = 0.0
!LSLF = CLG
sol_LSL(1,j) = sol_LSL(1,j) + RLR*resnew
sol_LSC(1,j) = sol_LSC(1,j) + 0.42*LSF * resnew
sol_LSLC(1,j) = sol_LSLC(1,j) + RLR*0.42* resnew
sol_LSLNC(1,j) = sol_LSC(1,j) - sol_LSLC(1,j)
!X3 = MIN(X6,0.42*LSF * resnew/150)
if (resnew_ne >= (0.42 * LSF * resnew /150)) then
sol_LSN(1,j) = sol_LSN(1,j) + 0.42 * LSF * resnew / 150
sol_LMN(1,j) = sol_LMN(1,j) + resnew_ne -
& (0.42 * LSF * resnew / 150) + 1.E-25
else
sol_LSN(1,j) = sol_LSN(1,j) + resnew_ne
sol_LMN(1,j) = sol_LMN(1,j) + 1.E-25
end if
!LSNF = sol_LSN(1,j)/(sol_LS(1,j)+1.E-5)
sol_LMC(1,j) = sol_LMC(1,j) + 0.42 * LMF * resnew
!LMNF = sol_LMN(1,j)/(sol_LM(1,j) + 1.E-5)
!update no3 and nh3 in soil
sol_no3(1,j) = sol_no3(1,j) * (1-sf)
sol_nh3(1,j) = sol_nh3(1,j) * (1-sf)
end if
!!insert new biomss by zhang
!!===========================
sol_fop(1,j) = (dmii - bio_ms(j)) * pltfr_p(j) + sol_fop(1,j)
end if
!! apply manure
it = 0
it = manure_id(j)
if (manure_kg(j) > 0.) then
l = 1
if (cswat == 0) then
sol_no3(l,j) = sol_no3(l,j) + manure_kg(j) *
& (1. - fnh3n(it)) * fminn(it)
sol_fon(l,j) = sol_fon(l,j) + manure_kg(j) *
& forgn(it)
sol_nh3(l,j) = sol_nh3(l,j) + manure_kg(j) *
& fnh3n(it) * fminn(it)
sol_solp(l,j) = sol_solp(l,j) + manure_kg(j) *
& fminp(it)
sol_fop(l,j) = sol_fop(l,j) + manure_kg(j) *
& forgp(it)
end if
if (cswat == 1) then
sol_no3(l,j) = sol_no3(l,j) + manure_kg(j) *
& (1. - fnh3n(it)) * fminn(it)
sol_mn(l,j) = sol_mn(l,j) + manure_kg(j) *
& forgn(it)
sol_nh3(l,j) = sol_nh3(l,j) + manure_kg(j) *
& fnh3n(it) * fminn(it)
sol_solp(l,j) = sol_solp(l,j) + manure_kg(j) *
& fminp(it)
sol_mp(l,j) = sol_mp(l,j) + manure_kg(j) *
& forgp(it)
sol_mc(l,j) = sol_mc(l,j) + manure_kg(j) *
& forgn(it) * 10.
end if
!!By Zhang for C/N cycling
!!===============================
if (cswat == 2) then
sol_no3(l,j) = sol_no3(l,j) + manure_kg(j) *
& (1. - fnh3n(it)) * fminn(it)
!sol_fon(l,j) = sol_fon(l,j) + manure_kg(j) *
& ! forgn(it)
orgc_f = 0.35
X1 = manure_kg(j)
X8 = X1 * orgc_f
RLN = .175 *(orgc_f)/(fminp(it) + forgn(it) + 1.e-5)
X10 = .85-.018*RLN
if (X10<0.01) then
X10 = 0.01
else
if (X10 > .7) then
X10 = .7
end if
end if
XX = X8 * X10
sol_LMC(l,j) = sol_LMC(l,j) + XX
YY = manure_kg(j) * X10
sol_LM(l,j) = sol_LM(l,j) + YY
ZZ = manure_kg(j) *forgn(it) * X10
sol_LMN(l,j) = sol_LMN(l,j) + ZZ
sol_LSN(l,j) = sol_LSN(l,j) + manure_kg(j)
& *forgn(it) -ZZ
XZ = manure_kg(j) *orgc_f-XX
sol_LSC(l,j) = sol_LSC(l,j) + XZ
sol_LSLC(l,j) = sol_LSLC(l,j) + XZ * .175
sol_LSLNC(l,j) = sol_LSLNC(l,j) + XZ * (1.-.175)
YZ = manure_kg(j) - YY
sol_LS(l,j) = sol_LS(l,j) + YZ
sol_LSL(l,j) = sol_LSL(l,j) + YZ*.175
sol_fon(l,j) = sol_LMN(l,j) + sol_LSN(l,j)
sol_nh3(l,j) = sol_nh3(l,j) + manure_kg(j) *
& fnh3n(it) * fminn(it)
sol_solp(l,j) = sol_solp(l,j) + manure_kg(j) *
& fminp(it)
sol_fop(l,j) = sol_fop(l,j) + manure_kg(j) *
& forgp(it)
end if
!!By Zhang for C/N cycling
!!===============================
!! add bacteria - #cfu/g * t(manure)/ha * 1.e6 g/t * ha/10,000 m^2 = 100.
!! calculate ground cover
gc = 0.
gc = (1.99532 - Erfc(1.333 * laiday(j) - 2.)) / 2.1
if (gc < 0.) gc = 0.
gc1 = 0.
gc1 = 1. - gc
swf = .15
frt_t = 0.
frt_t = bact_swf * manure_kg(j) / 1000.
bactp_plt(j) = gc * bactpdb(it) * frt_t * 100. + bactp_plt(j)
bactlp_plt(j) = gc * bactlpdb(it) * frt_t * 100.+bactlp_plt(j)
bactpq(j) = gc1 * bactpdb(it) * frt_t * 100. + bactpq(j)
bactpq(j) = bactkddb(it) * bactpq(j)
bactps(j) = gc1 * bactpdb(it) * frt_t * 100. + bactps(j)
bactps(j) = (1. - bactkddb(it)) * bactps(j)
bactlpq(j) = gc1 * bactlpdb(it) * frt_t * 100. + bactlpq(j)
bactlpq(j) = bactkddb(it) * bactlpq(j)
bactlps(j) = gc1 * bactlpdb(it) * frt_t * 100. + bactlps(j)
bactlps(j) = (1. - bactkddb(it)) * bactlps(j)
endif
!! reset leaf area index and fraction of growing season
if (dmi > 1.) then
laiday(j) = laiday(j) * bio_ms(j) / dmi
phuacc(j) = phuacc(j) * bio_ms(j) / dmi
else
laiday(j) = 0.05
phuacc(j) = 0.
endif
!! summary calculations
!! I do not understand these summary calculations Armen March 2009
grazn = grazn + manure_kg(j) *
& (fminn(it) + forgn(it))
grazp = grazp + manure_kg(j) *
& (fminp(it) + forgp(it))
tgrazn(j) = tgrazn(j) + grazn
tgrazp(j) = tgrazp(j) + grazp
if (curyr > nyskip) then
wshd_ftotn = wshd_ftotn + manure_kg(j) *
& hru_dafr(j) * (fminn(it) + forgn(it))
wshd_forgn = wshd_forgn + manure_kg(j) *
& hru_dafr(j) * forgn(it)
wshd_fno3 = wshd_fno3 + manure_kg(j) *
& hru_dafr(j) * fminn(it) * (1. - fnh3n(it))
wshd_fnh3 = wshd_fnh3 + manure_kg(j) *
& hru_dafr(j) * fminn(it) * fnh3n(it)
wshd_ftotp = wshd_ftotp + manure_kg(j) *
& hru_dafr(j) * (fminp(it) + forgp(it))
wshd_fminp = wshd_fminp + manure_kg(j) *
& hru_dafr(j) * fminp(it)
wshd_forgp = wshd_forgp + manure_kg(j) *
& hru_dafr(j) * forgp(it)
! yldkg(nro(j),1,j) = yldkg(nro(j),1,j) + (dmi - bio_ms(j))
yldkg(icr(j),j)=yldkg(icr(j),j) + (dmi - bio_ms(j))
end if
end if
!! check to set if grazing period is over
if (ndeat(j) == grz_days(j)) then
igrz(j) = 0
ndeat(j) = 0
ngr(j) = ngr(j) + 1
end if
return
end