SORTIE-NDSoftware for spatially-explicit simulation of forest dynamics
The allometry relationships govern a tree's size and shape.
Tree size attributes
Attributes by life history stage
How size and shape attributes are used
Many behaviors do their work using equations that are functions of tree size in some way. Diameter is by far the most important attribute. Other dimensions may or may not be used in a run, depending on the set of chosen behaviors. How important it is to get the allometric relationships correct depends on how they will be used. Check the documentation of your chosen behaviors. If, for instance, crown shape is not used, it doesn't really matter what relationships you assign.
Trees are not required to conform to their allometric relationships. For instance, growth many cause height and diameter to vary independently of each other.
You choose the relationship used by each life history stage of each species for each attribute. These can be freely mixed-and-matched. Use the Edit Allometry Functions window to set the allometry functions.