This behavior increments growth according to two possible growth equations, one to be used in low-light conditions and the other to be used in high-light conditions. This behavior was originally created for the Puerto Rico model.
Parameter name | Description |
---|---|
PR Storm Bi-Level - Threshold for High-Light Growth (0 - 100) | The threshold between low-light and high-light equations, as a value between 0 and 100. |
PR Storm Bi-Level - High-Light "a" | The "a" value in the high-light growth function. |
PR Storm Bi-Level - High-Light "b" | The "b" value in the high-light growth function. |
PR Storm Bi-Level - Intercept for Low-Light Growth (a) | The intercept of the linear growth function used in low-light conditions. |
PR Storm Bi-Level - Slope for Low-Light Growth (b) | The slope of the linear growth function used in high-light conditions. |
Light levels come from the Storm Light grid produced by the Storm Light behavior. The threshold between the use of the high-light and low-light functions is set in the PR Storm Bi-Level - Threshold for High-Light Growth (0 - 100) parameter.
The function used in low-light conditions is:
where
The function used in high-light conditions is:
where
H is expressed in centimeters of height growth. This is transformed into a number of cm of diameter growth, which is what this behavior passes along. This means that during tree life history stage transitions, the height the tree ends up with is not guaranteed to match the height calculated by the high-light growth function.
This behavior can be applied to seedlings, saplings, and adults of any species. You must also use the Storm disturbance and Storm Light behaviors.