Size Dependent Logistic Mortality applies a mortality function that is a logistic function of tree size. Trees killed by this behavior will have a mortality reason code of "natural".
| Parameter name | Description |
|---|---|
| Max Mortality (0-1) | Maximum mortality rate, as a value between 0 and 1. |
| X0 | Logistic function X0 parameter. |
| Xb | Logistic function Xb parameter. |
For each tree to which this behavior is applied, the following function is evaluated:

The probability is compared to a random number to determine whether the individual tree will die.
This behavior may be applied to seedlings, saplings, and adults of any species.