This model has the human economic assets (Q) depending on the human productive activity based on the land in economic use (A2) and the stored products of environmental work such as wood and soil (S). The environmental support system has assets (B) which depend on the enviromental sources (I0) and the fallow land.
Variables:B = environmental support system assets
Q = human economic assets
S = wood and soil
A1 = fallow land
A2 = A - A1
DB = k2*R*A1 - k3*B - k4*B - k5*B*A1 - k9*B
DS = k6*B*A1 - k7*S - k8*S*R*A2*Q
DQ = L3*Q*A2*S*R + L4*S - L5*Q - L6*A1*Q
DA = L1*A2*B - L2*Q*A1
Simulation:The graph shows the changes of B(red), Q(pink), S(blue) and A2(green) over a time period.
Source code: Rotation.java
"What if" Experiments: