Orekhova T.P., Cand. Sci.(.S.R.I.T.S.O.M.R.O.F.A.A.O.P., Malysheva S.K., Cand. Sci.(.S.R.A.T.L.O.D., Gorokhova S.V., Cand. Sci.(.H.O.T.D.O.I.O.W.P.
Lesnoy vestnik. Forestry Bulletin 2025; 29(4): 39-51
The paper presents taxation indices of candidates for plus plantation and plus trees of Mongolian oak ( Quercus mongolica Fish. ex Ledeb.) selected in the territory of the Verkhneussurian forest station of the Federal Research Centre for Biodiversity of the Far Eastern Branch of the Russian Academy of Sciences (Chuguevsky District, Primorsky Krai). The Mongolian oak trees were selected in accordance with the characteristics of the plus tree (according to age, straightness of stem, trunk purity and growth rate). An analysis of the size and shape of acorns was carried out, which allowed us to establish that they belong to the northern ecotype and have oval and rounded shapes. A low degree of variability in the morphometric characteristics of acorns has been established (coefficient of variation is up to 15 %). A comprehensive assessment of the seed progeny of candidates for plus trees at the initial stages of ontogenesis (one- and two-year-old plants) was carried out. A high level of variability in the height of annual seedlings and biennial plants in individual families and between individual trees has been determined (coefficient of variation up to 50 %). The highest level of variability in the height of two-year-old seedlings within families was observed in the offspring of trees no. 2, 001, 003. It was revealed that two-year-old seedlings actively formed lateral shoots and photosynthetic organs. There is a great variability in the number and length of shoots both in families and in the offspring of individual trees (the coefficient of variation is more than 50 %). The Mongolian oak plantation studied in the coniferous-broadleaved forest represents a unique genetically isolated population of seed origin. The selected trees are recommended to be regarded as plus trees.
