i a
DESCRIPTION
A Bucket-type Ecohydrology model: Water Balance. ET. Canopy. I a. S. Z r. D. Erkan Istanbulluoglu University of Nebraska. Laio et al. [2001]. Tracking Grassland Dynamics. Net Primary Productivity:. Green Biomass, B g :. Root Biomass, B r :. Dead Biomass, B d :. - PowerPoint PPT PresentationTRANSCRIPT
S
Ia
Zr
ET
€
nZrds
dt= Ia(s,p ,V )− ET (s,V )− D(s)
A Bucket-type Ecohydrology model: Water Balance
D
sh sw s*
sfc
Soil Moisture
ETp
Emin
sh<s<sw sw<s<s* s*<s
Losses (mm/day)
D + ETp
Laio et al. [2001]
Canopy
Erkan IstanbulluogluUniversity of Nebraska
€
NPP = ETaWUEρ vω
€
dBgdt
= NPPφa − ksgBg − ksf ξBg
€
dBrdt
= NPP(1−φa )− kdrBr − ksrBr
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dBddt
= ksgBg − kddBd
Net Primary Productivity:
Green Biomass, Bg :
Dead Biomass, Bd:
Root Biomass, Br:
Tracking Grassland Dynamics
WUE: Water use efficiency taken as constant
Kx : Decay coefficient for variable x.€
φa = 1−LAIgLAIgmax
⎛
⎝ ⎜ ⎜
⎞
⎠ ⎟ ⎟Allocation coefficient:
MODEL PREDICTIONS: SOIL MOISTURE
P
Time
MODEL PREDICTIONS: VEGETATION BIOMASS
MODEL PREDICTIONS: VEGETATION LIA
MODEL PREDICTIONS - ET SINUSOIDAL FUNCTION
MODEL PREDICTIONS (1890 - 2007)
POISSON PULSE STORM FORCING W/ SEASONALITY