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

Establishment behaviors

Establishment behaviors assess seed survival and create new seedlings from seeds. Establishment behaviors do not create or distribute the seeds. The Disperse behaviors perform that function.

The seed survival behaviors act to reduce the number of seeds based on various environmental effects. They can be used alone or in combination. Once they have completed their work, the number of surviving seeds can be turned into seedlings by either the Seed Establishment or Establishment with Microtopography behaviors.

BehaviorDescription
Conspecific Tree Density Dependent Seed SurvivalAssesses seed survival as a function of the local density of conspecific trees.
Density Dependent Seed SurvivalAssesses seed survival as a function of the local density of conspecific seeds.
Establishment with MicrotopographySimulates microtopography in the plot and assigns new seedlings a rooting height as a function of the type of substrate on which they land.
Light Dependent Seed SurvivalAssesses seed survival as a function of the Global Light Index (GLI) of the location in which a seed lands.
Proportional Seed SurvivalReduces the number of seeds by a set amount.
Seed EstablishmentConverts seeds into seedlings.
Storm Light Dependent Seed SurvivalThis behavior assesses seed survival as a function of the light level of the location in which a seed lands.
Substrate Based Seed Survival With MicrotopographyThis behavior assesses seed survival based on substrate conditions, allowing for site microtopography to influence seed survival.
Substrate Dependent Seed Survival No Gap StatusThis behavior assesses seed survival as a function of the substrate composition of the grid cells in which seeds land.
Substrate Dependent Seed Survival With Gap StatusThis behavior assesses seed survival as a function of both the substrate composition of the grid cells in which seeds land and the cells' forest cover (gap or canopy).