FIGURE 5.

The survival rate, cumulative mortality rate, mortality density rate and hazard rate function curves (a), and the time sequence prediction (b) of Cydonia oblonga population. X represents the age classes which are divided into class A₁, A₂, A₃, A₄, A₅, A₆, A₇, and A₈ according to the basal diameter class; A _x , survival number; l _x , standardized survival number; d _x , death number; q _x , standardized mortality rate; L _x , span life; T _x , total life; e _x , life expectancy; K _x , the disappearance rate; S _x , the survival rate. Using the time sequence model, the population developmental trend in the next A₂ (M2), A₄ (M4), A₆ (M6), and A₈ (M8) age classes were predicted.