Study of the growth processes of the manchurian ash tree based on the materials of the state forest inventory

Coniferous-deciduous forests in the southern part of the Far East are a unique collection of tree species left to us from the tertiary period. Many families, genera and species grow here. A prominent representative of the Olive family (Oleaceae Hoffmgg.et Link) is a genus of ash (Fraxinus L). The genus is represented by Manchurian ash (F. mandshurica Rupr.). In natural conditions, it forms ilmovo-ash, and sometimes ash uremes. Manchurian ash grows as part of coniferous-deciduous forests, occurs both in single specimens and in small groups. It does not form one type of plantings. In some allotments, its share can reach 40 % of the total stock of planting. The maximum age of individual trees reaches 200 years or more, height is 25–30 m, diameter is up to 1.0 m. The trunks are straight, full-timbered, the crown is openwork, the bark is smooth. It requires fertile soils. On well-drained soils, it shows a high growth rate, especially at a young age.

As a consequence, quantitative ripeness in the planting occurs at the age of 40, technical one occurs at 80 years.  It has a high winter hardiness, which provides it with advantages over other species in afforestation in northern areas. It is ornamental and tolerant of crown pruning in urban plantings. The regulatory framework compiled for this species includes growth progress tables, volumetric, assortment and commodity tables. Growth progress tables are compiled for three types of forests and characterize the dynamics of taxation indicators between 10 and 100 years. In this article, based on the materials of the state forest inventory, a growth progress table for Manchurian ash was constructed. The experimental material included 121 model Manchurian ash trees. The average values of heights, diameters and reserves are equalized using a parabola of the 2nd order. The dynamics of the average values of taxation indicators is calculated in the growth progress table: height, diameter and available stock.

The output of large plus medium-sized business timber has been determined. According to these data, the age of quantitative and technical ripeness of the forest has been established. The listed indicators reflect the dynamics of the average data for this forest-forming species. The accuracy of determining the stock is not less than 5%. Taking into account the high production characteristics of Manchurian ash, the developed standard can be considered an addition to the existing regulatory framework, which is important for the intensification of forestry production in the region. The developed tables can be used to assess and forecast wood stocks in plantings with the participation of Manchurian ash.

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