Equations in BallBerry4aP
Equations in Environment
Variable C_a : Carbon dioxide concentration (umol CO2 (mol air)^-1)
C_a = graph(time())
Comments:
Typical diurnal curve in forest canopy
Variable H : Relative humidity (proportion)
H = graph(time())
Comments:
Typical diurnal graph (24 hour)
Variable Q : Photon flux density (umol m^-2 s^-1)
Q = graph(time())
Comments:
Graph for a sunny day (24 hours)
Equations in Ball-Berry
Variable Gs_start
Gs_start = if time()==0 then g_0 else last(Gs_0)
Where:
Gs_0=Iteration time step/Gs_0
Variable g_0 : Stomatal conductance in the dark (mol m^-2 s^-1)
g_0 = 0.01
Variable g_1 : Ball-Berry stomatal conductance coefficient
g_1 = 23
Equations in Iteration time step
Alarm
Variable Gs
Gs = if loop_count==0 then Gs_start else Gs_0
Where:
Gs_start=../Gs_start
Variable Gs_0 : Stomatal conductance (mol m^-2 s^-1)
Gs_0 = g_0+g_1*A*H/C_a
Where:
A=Assimilation/A
H=../../Environment/H
C_a=../../Environment/C_a
g_0=../g_0
g_1=../g_1
Comments:
Ball-Berry equation
Variable loop_count
loop_count = iterations(al1)
Equations in Assimilation
Variable A : Assimation (umol CO2 m^-2 s^-1)
A = A_Q*Gs
Where:
Gs=../Gs
Variable A_Q : Assimilation light response curve
A_Q = graph(Q)
Where:
Q=../../../Environment/Q
Comments:
Relationship of Assimilation with photon flux density (light) when stomatal conductance (Gs) is maximum
