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

Michaelis Menton with photoinhibition - height only

This behavior uses a modified Michaelis-Menton function to do height growth.

Parameters for this behavior

Parameter nameDescription
Michaelis-Menton with Photoinhibition - AlphaAlpha parameter.
Michaelis-Menton with Photoinhibition - BetaBeta parameter. Cannot be equal to zero.
Michaelis-Menton with Photoinhibition - DD parameter.
Michaelis-Menton with Photoinhibition - PhiPhi parameter.

How it works

The amount of height growth is calculated as:

Michaelis

where:

  • Y is the amount of height growth for one year, in cm
  • GLI is the light level
  • α is the Michaelis-Menton with Photoinhibition - Alpha parameter
  • β is the Michaelis-Menton with Photoinhibition - Beta parameter
  • D is the Michaelis-Menton with Photoinhibition - D parameter
  • φ is the Michaelis-Menton with Photoinhibition - Phi parameter
  • H is the tree's height in cm

If the timestep is more than one year long, growth is recalculated for each year of the timestep, increasing the height each time.

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 and a diameter growth behavior applied.