SORTIEND
Software for spatiallyexplicit simulation of forest dynamics 

Stochastic BiLevel MortalityThis behavior applies a constant rate of mortality to trees, with different rates for highlight and lowlight conditions. There are two versions, designed to work with different behaviors that calculate light levels (Stochastic BiLevel Mortality  Storm Light and Stochastic bilevel mortality  GLI) Trees killed by this behavior will have a mortality reason code of "natural". Parameters for this behavior
How it worksIn the version of the behavior called Stochastic BiLevel Mortality  Storm Light, light levels come from the Storm Light grid produced by the Storm Light behavior. In the version called Stochastic BiLevel Mortality  GLI, light levels come from any light behavior that can be applied directly to trees. The threshold between the use of highlight and lowlight parameters is set in the Stochastic BiLevel  HighLight Mortality Threshold parameter. The units depend on which index of light is being used. Check the documentation on your chosen light behavior carefully. For each tree, a random number is compared to that species's probability of mortality to determine if it dies. If light levels qualify as high light, the probability of mortality is the value in the Stochastic BiLevel  HighLight Mortality Probability (01) parameter; if the light levels are low, the probability of mortality is the value in the Stochastic BiLevel  LowLight Mortality Probability (01) parameter. If the timestep length is not one year, the probability of mortality is adjusted from an annual mortality probability to a timestep probability. How to apply itThis behavior can be applied to seedlings, saplings, and adults of any species. If you have chosen the version marked "Storm Light", you must also use the Storm Light behavior. If you have chosen the version marked "GLI", you must assign a light behavior to all trees to which you assign this mortality. 

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