Mortality for Mid-Rotation and Old-Growth Black Spruce
For Black Spruce with DBH>4, annual survival probability (Ps) is predicted using a logistic model.
Pslogistic = exp(c) / (1+exp(c))
Where: C = 4.1334504 + 0.0357828 * dbh - 0.00351298 * Dbh2 + 2.859369 * stAvDbh / dbh - 0.0268818 * stBa - 0.657523 * stSc - 0.036622 * SI
DBH is in cm
stAvgDBH is the stand average DBH
stBa is the stand basal area (m2/ha)
stSc = Black Spruce relative composition of the stand by BA
SI is the black spruce site index
Note: if the MaxDenAdj flag is on, black spruce survival will be adjusted is stand density exceeds the self-thinning line.