Morphostructural variability parameters of different age generations in pine (Pinus sylvestris L.) populations under constant excessive soil moisture in northern taiga of Arkhangelsk region

Abstract

The data is presented for studying the variability of morphostructural parameters of different age (g1 and g2) pine populations under conditions of constant excessive soil moisture of the northern taiga of the Arkhangelsk region. The frequency of occurrence distribution of the age and morphostructural parameters (size of the trunk and crown, self-pruning, length of coarse bark, size and number of side shoots, length and life span of needles) of trees is shown. It has been established that pine trees with smaller trunk and crown sizes, worse self-pruning are more common. Greater height and diameter of the trunk, length and diameter of the crown, better self-pruning, a greater length of the coarse bark is observed in the older generation (g2). This is due to the older age of the trees. It has been established that the relationship between the height of the trunk and the age of the trees is higher in the samples of young generative trees. It was revealed that the young generation (g1) has a significantly greater length and mass of cones, the length, width and height of the apophysis of seed scales compared to the older generation (g2).