Olginsky larch (Larix Olgensis A. Henry) current state on Borisov plateau (Primorsky region)

The modern literature on dendrology recognizes and describes 3 species of larch: Gmelin (Daurian) larch (L. gmelinii (Rupr) Rupr), Kayander larch (L. cajanderi Mayr.) and Olginsky larch (Larix olgensis A. Henry). However, Far Eastern foresters-researchers believe that the Lyubarsky larch, described in 1931 by V.N. Sukachev, grows on the territory of Primorsky Krai. The article presents research data on the current state of the Olginskaya larch (Lyubarsky larch) biogroups on the territory of the Borisov Plateau in Primorsky Krai. The Olginsky larch vegetation area and the grass cover of the territory is described in detail. The characteristics of the stand are given according to taxation indicators: origin, composition divided into stories (by weight and number of trees), age, forest density, average height and diameter, bonus, sum of cross-sectional areas, stock. The measurement results of 100 larch trees (diameter and height) were processed in the Exel STATISTIKA program. The age of the stand was determined, the influence of the average annual temperature and the annual amount of precipitation on the growth of larch in diameter was analyzed. The dynamics of the growth of model trees in diameter is analyzed. It has been established that the Olginskaya larch under the conditions of the Borisov Plateau shows negative growth rates in diameter with a lack and excess of moisture, and also at high temperatures the growth rates decrease. The analysis showed that in the conditions of the Borisov plateau there is a general dependence of the increments in diameter on climatic factors. Larch trees growing in the same micro-conditions showed completely different growth rates, which is obviously explained by genetic differences.