SORTIE-ND
Software for spatially-explicit simulation of forest dynamics

# Linear growth

This behavior does either diameter or height growth as a linear function of GLI.

### Parameters for this behavior

Parameter nameDescription
Simple Linear - Diam Intercept in mm/yr (a)Intercept of the linear growth function, or growth at no light, in mm/yr, for diameter growth.
Simple Linear - Diam Slope (b)Slope of the linear growth function, for diameter growth.
Simple Linear - Height Intercept in cm/yr (a)Intercept of the linear growth function, or growth at no light, in cm/yr, for height growth.
Simple Linear - Height Slope (b)Slope of the linear growth function, for height growth.

### How it works

This behavior calculates an amount of diameter or height growth as:

Y = (a + (b * GLI)) * T

where

• Y = amount of radial increase, in mm, or amount of height increase, in cm
• a = Simple Linear - Diam Radial Intercept in mm/yr (a) parameter (for diameter growth) or the Simple Linear - Height Intercept in cm/yr (a) parameter (for height growth)
• b = Simple Linear - Diam Radial Slope (b) parameter (for diam growth) or the Simple Linear - Height Slope (b) parameter (for height growth)
• GLI = global light index, as a percentage between 0 and 100, calculated by a light behavior
• T = number of years per timestep

### 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 light behavior applied. You can choose either a diam with auto height, diam only, or height only version.