Lognormal bi-level growth - height only

This behavior increments growth according to a lognormal equation, with the possibility of two sets of parameters for each species: one for high-light conditions and one for low-light conditions. This can also be used alone without the light levels.

Parameters for this behavior

How it works

The equation used by this behavior to increment growth is:

where

• Y - amount of height growth in m
• MG - maximum growth, in meters; in high-light conditions, this is the Lognormal Bi-Level - Max Growth in High Light (m) parameter; in low-light conditions, this is the Lognormal Bi-Level - Max Growth in Low Light (m) parameter
• X₀ - in high-light conditions, this is the Lognormal Bi-Level - X0 for High-Light Growth parameter; in low-light conditions, this is the Lognormal Bi-Level - X0 for Low-Light Growth parameter
• X_b - in high-light conditions, this is the Lognormal Bi-Level - Xb for High-Light Growth parameter; in low-light conditions, this is the Lognormal Bi-Level - Xb for Low-Light Growth parameter
• H - tree height in meters
• T - number of years per timestep

Light levels come from the Storm Light grid produced by the Storm Light behavior. The threshold between the use of high-light and low-light parameters is set in the Lognormal Bi-Level - Threshold for High-Light Growth (0 - 100) parameter.

This behavior can also be used without Storm Light. In this case, only the low-light growth parameters are used.

How to apply it

This behavior can be applied to seedlings, saplings, and adults of any species. Any tree species/type combination to which it is applied must also have a diam-only growth behavior applied. If you wish to use the light-level parameter switch, also use the Storm Light behavior.