Home – Home – Jornals – Siberian Journal of Forest Science 2016 number 5

In this report the results of individual and clone variability of the number of cones on Korean pine Pinus koraiensis Siebold et Zucc. grafting trees on experimental seed plantation (up to 21 years) in Khekhtsirskii Forestry unit of Khabarovsk region are presented. The maximum characteristics of seed bearing were proper for clones of trees at the age of 170-195 with a large number of the previous year sprouts and the average annual growth in the range of 0.12-0.15 m in height and 0.24-0.29 cm in diameter. The trees over 200 years have weak vitality grafts. That’s why the age of Korean pine seed productivity breeding should be limited by this age. The coefficients of variation of the clone seed bearing characteristics amount to 35-56 % during the first decade, later - up to 154 %. The variability of the whole population is the same. Sometimes, the Rate of Relative Total Seed Productivity (RRTSP) differs ten or more times in two trees of one clone, while the best clones exceed the worst ones 2-6 times. As consistent with a single-factor analysis of variance, clone differences in the numbers of cones are not significant for P = 0.05. This characteristic heritability coefficient ( H ²) has not exceeded 0.08 during of all dates of the observations, including the twenty first years after the seed plantation creation. It is recommended to organize protection and enclosure of the most valuable plots, to optimize the graft and nursing technology for the grafted seed plantations. It is necessary to prepare the graft cuttings only from productive trees of productive clone before genetic certification.