The article is devoted to the issue of the methodology of genetic certification of the main forest-forming species, which has now acquired particular relevance and requires regulation in the legal field. A uniform regulated approach to the logistical equipment of laboratories and methods of performing work on the use of molecular genetic diagnostic methods in the forest industry is the key to forming a reliable foundation for an objective and scientifically sound assessment of a single set of reliable data on the genetic stability or intraspecific variability of a particular forest population. Due to the socio-political situation in the country, improving approaches to database formation is particularly important, as the Russian Federation may be isolated from the world databases. Ensuring the sovereignty of the country  in the complex solution of the tasks of accelerated development of genetic technologies, in particular in the forest industry,  is a necessary step, including the ensuring of national environmental and economic security. Analysis of nine existing databases of plant genetic resources hosted on publicly available platforms on the Internet, as well as the industry – specific automated analytical system AAS “Forest Genetics”, created at the Federal State Budgetary Institution Roslesozashchita as part of the implementation of the Integrated Biotechnology Development Program in the Russian Federation for the period up to 2020, approved by the Government of the Russian Federation on 04.24.2012 No. 1853p-P, allowed us to formulate a number of proposals for improving approaches to organizing a reference database of genetic data on the main forestforming species. To improve the efficiency of working with the Forest Genetics system, it is planned to expand the geographical network of sample collection, introduce forest-seed zoning and a raster layer of maps, implement the function of visualizing surveys and results, expand the database of forest diseases and pests (including microorganisms). At the same time, in general, the conceptual approach to the formation of this analytical system is close to the existing international one.

Forests play an important role in the global carbon cycle and climate stabilization. Reforestation of abandoned and non-agricultural lands is a significant mechanism for mitigating the effects of climate change. In the Krasnoyarsk forest-steppe, on former agricultural lands, predominantly pine stands are formed, characterized by a homogeneous composition, with rare presence of birch, larch and spruce. A clear stage-by-stage development of these pine stands is observed. Three main stages can be distinguished: the formation stage (age up to 10 years), characterized by a period of restoration and early development of tree species; the moderate growth stage (11–17 years), when there is an intensive increase in biomass; and the intensive growth stage (18 years and older), which is characterized by maximum development and growth of pine trees. The Gompertz equation was used to study the dynamics of pine forest growth in height. Based on the structure of grouped rows by diameter, the analysis of the process of pine forest formation in post-agricultural conditions was performed. The criterion was the assessment of the form of distribution series. As a result, the process of reforestation of pine forests on former agricultural lands of Krasnoyarsk forest-steppe was characterised. Analysis of the forms by tree diameter makes it possible to assess the dynamics and characteristics of restored stands. This approach allows for a more accurate determination of the stages of pine forest development on fallow lands and the development of optimal strategies for managing forest restoration processes in the region. The results obtained are of practical importance for monitoring and planning measures to restore forest ecosystems on former agricultural lands. Such an integrated approach, based on a combination of analytical methods and specific data, allows for a more efficient use of the potential of forest ecosystems to mitigate the effects of climate change.

The article discusses the problems of calculating the linear resolution on the ground, as an indicator of the accuracy of the taxation and decryption measurements on digital aerial photographs obtained by means of UAV. The work is based on the analysis of more than 100 scientific publications on the theory and methodology of digital image registration, assessment of their quality and metric properties, general and forest aerial photography, forest taxa measurements and forest decoding, optimization of the choice of UAVs in application to the tasks of forest taxation and urban landscaping. As the results of the work, a modified version of the mathematical model and calculation algorithm are proposed, which, based on the determination of the linear resolution on the ground of a digital aerial photography system allows: to assess the estimated accuracy limits of decryption taxation for the current level of UAV development; to evaluate the required accuracy of groundbased taxation measurements when developing decryption models for UAV taxation; to make an adequate choice of UAVs in standard configuration for production of taxicab aerial photography; to carry out an independent selection of UAV filming equipment for solving the tasks of decoding forest taxation and inventory of urban landscaping. 

Based on the results of the databases of forest management materials processing and the results of laying out test plots with felling of accounting trees it was established the advisability of switching from quantitative to technical maturity in the leased areas of large pulp and paper mills. The latter is calculated on the maximum yield of the most popular assortment of coniferous pulpwood. Establishing of technical maturity will allow reducing the cutting age in spruce stands leased for timber procurement by the JSC “Solikamskbumprom” from 81–100 to 61–80 years in plantings of quality class III or higher and from 101–120 to 81–100 years in plantings of IV quality class or lower.

This will not only ensure an increase in timber yield per unit of area, forest productivity, but also minimize the risk of spruce plantations dying from forest fires, strong winds and epiphytotics of pests and diseases, in particular the engraver beetle (Ipstypographus L.). 

At the same time, reducing the cutting age will necessitate a transition from measures to promote natural regeneration to artificial and combined reforestation of spruce stands with mandatory implementation of agricultural and silvicultural care.

The research was conducted on the LEP-2 plantation located in the Karaulnoye forestry of the Educational and Experimental Forestry Enterprise of the Siberian State University of Science and Technology named after M. F. Reshetnev. The second generation of Pinus Sibirica of different geographical origins: Altai (Atushken, Kurli, Tushtuezhen tracts), Biryusinsky, Tanzybeysky, Tisulsky, Cheremkhovsky, Yartsevsky grows on this plantation. The plantation was created from seeds collected on the Meteostation and Izvestkovaya geographical plantations located in the same forestry. According to the intensity of growth on the plantation “LEP-2” there are specimens that exceed the average value by origin in height and trunk diameter by more than 15 %: No. 6-3, 6-18, 6-38, 6-43, 6-46, 3-43,3-47 of Altai origin; No. 2-30, 2-36 and 5-8 of Biryusinsky origin; No. 3-10, 3-11, 3-13, 3-15, 8-43 of Tisulsky origin and  No. 4-9, 4-12, 4-15, 9-6 of Yartsevsky origin on the plantation “Meteostation”: and No. 4-30, 4-37, 4-40 of Tanzybei origin and No. 2-12, 2-14, 2-15, 2-17, 8-2 of Cheremkhovsky origin on the Izvestkovaya plantation. According to early reproductive development with the formation of macrostrobiles, 6 trees stand out. The largest number of macrostrobiles was in specimens No. 5-12 of Biryusinsky (4 pcs.) and № 8-37 of Tisulsky (3 pcs) origin. Microstrobiles were formed in 12 trees. The highest value was in specimen No. 4-21 of Yartsevsky and No. 6-7 of Altai (ur. Atushken) origin. Two specimens that formed macro- and microstrobiles were selected: No. 3-32 of Tisulsky and № 5-12 of Biryusinsky origin, and two specimens are both fast-growing and early in pollen formation: No. 3-13 of Tisulsky and No. 6-46 of Altai (ur. Kurli) origin. Selected specimens are supposed to be propagated vegetatively in order to grow planting material characterized by intensive growth and early reproductive development.

The data on the reproductive development of Siberian pine (Pinus sibirica Du Tour) trees of 38-yearold biological age, which are seed progeny (semi-sibs) of plus trees certified in the Kolyvansky forestry of Novosibirsk Oblast and in the Slyudyansky forestry of the Irkutsk Oblast, are presented. Semi- sibs are planted in the arboretum  of Siberian State University on the site “Geoschool continuation”. The aim of the study was to establish the variability of seed bearing for Siberian pine trees and to identify specimens with increased reproductive capacity in 2024. The number of cones, macro- and microstrobiles in trees was determined. It has been established that depending on the progeny of plus trees, their variability in the formation of macro- and microstrobiles, cones is manifested. 21–40 cones were formed in 16 % of trees, 51–60 were formed in 3 %. Specimens with a large number of cones and high pollen productivity have been identified, which are recommended for further vegetative reproduction and the creation of productive forest seed plantations.

The use of correct allometric models is driven by the growing need for information on forest biomass to implement climate change policies and assess the carbon deposition capacity of forests. Since allometric models of biomass with a different number of predictive variables are proposed in the literature, and without taking into account the multicollinearity of the latter, an analysis of three- and two-factor models for the presence of multicollinearity was performed for the first time. For this purpose, the authors obtained actual data on the structure of aboveground biomass and morphology of Siberian cedar (Pinus sibirica Du Tour) for the forests of the Urals in the amount of 77 model trees. It has been established that the currently available database on the biomass of Siberian cedar trees does not make it possible to build correct multifactorial models under the condition of multicollinearity. A system of simple (onefactor) allometric models of the production and morphological parameters of Siberian cedar, adequate at a probability level of p < 0.05 and higher, is proposed. Models of production indicators can be used to assess the biological productivity of cedar forests per unit area in age dynamics and in modeling their carbon deposition capacity. Models of morphological indicators can be used in the analysis of the morphological structure of the canopy of cedar forests, including using deep learning methods. When using the available literature data, the specificity of the ratio of root biomass to aboveground biomass (R:S ratio) in age dynamics has been revealed for young cedar plantations. This ratio decreases from 0.43 to 0.17 in the age range from 4 to 21 years. 

Forest-steppe and subtaiga natural complexes of Siberia are one of the main parts of the human environment. They to a greater extent affect the climate, purity of air, water and soil, provide comfortable conditions for people to live and rest. The article discusses the features of the natural conditions of the Siberian forest-steppes and subtaiga (grass forests) and their role in the formation of Siberian landscapes. More attention is paid to the vegetation of different types of forest-steppes, steppes and light coniferous and deciduous forests. In addition, the characteristics of the soil cover and underlying rocks are given depending on the relief and exposure of the slopes. The views of different authors are given regarding the origin and development of forest-steppes, steppes and the zone of light coniferous and deciduous grass forests (subtaiga) from the point of view of the history of the formation of plant landscapes.

The formation of the timberline in the mountains is a complex process that depends on many simultaneously acting factors. Climatic factors are usually considered as priorities, for example, low air and soil temperatures and the associated shortened growing season. However, in mountainous areas with complex dissected relief, often not climatogenic, but landscape-like forest boundaries are formed, or mixed. A transect was laid on the territory of the Mountain Forestry of the Shushensky Bor National Park, including three test areas located at an altitude of 1347 to 1411 m above sea level, both in typical forest phytocenoses with a predominance of Siberian cedar pine (Pinus sibirica Du Tour) and at the upper limit of its distribution. The study revealed that during the formation of the timberline of the Pinus sibirica cedar advance on the slopes of the Borus Ridge, climatic factors and terrain features have a significant impact. Among the limiting factors, one can note not only a decrease in temperature as the altitude increases above sea level, but also a water shortage associated with a significant steepness of the slopes, which leads to an increase in surface runoff, and low-power soils are not able to retain enough moisture. Siberian pine trees growing in such conditions have a decrease in the length and weight of needles, and a decrease in the size of stomata is observed as a compensatory mechanism. Large stomata can increase water loss, while small stomata help reduce water loss, which is an important adaptation of plants for survival.

Harmonization of the flow lines of sawmills and drying shops is a problem in the foundation and operation of enterprises with large-scale mass flow technology. At present, it is aggravated by the fact that the requirement to “cut no more than 8 sections” is practically not met due to a large number of small orders that cannot be grouped and unified.

To synchronize the processes of cutting logs and drying lumber, the “stack accumulator – drying tunnels” system is presented as a multi-channel mass service system with waiting. A special type of open Markov chain of “death and reproduction processes” is used to describe it.

Using the marked graph of system states, a matrix for Markov transitions, Kolmogorov differential equations and expressions for the main operational characteristics of the system are obtained: the probability of full loading of drying tunnels (the efficiency of tunnels); the capacity of the stack accumulator; the waiting time of stacks in the accumulator. 

The productivity of skidding systems is greatly influenced by the average skidding distance, which is determined by the size of the cutting area, the location of the upper warehouse (loading point), the accepted scheme for the development of the cutting area, and the bearing capacity of soils. This indicator affects the coefficient of track lengthening due to maneuvering. All other things being equal, the lower the bearing capacity of the soils, the more maneuvering is required, the greater the average skidding distance becomes, the lower the productivity and the greater the specific energy intensity of the work. It is known that when working on low-bearing soils, skidding tractors are forced to tack up to 70 % of the entire cargo runtime. At the same time, the impact of maneuvering forest vehicles and skidding systems on slopes on permafrost has not yet been given due attention, although it is obvious that this significantly affects their environmental and operational efficiency. The article shows that special attention to the choice of the directions  of the skidding lines and technological corridors in terms of possible maneuvering of the vehicle should be paid to the working conditions on steep and very steep slopes, regulating the minimum deviations from the main direction  of movement of the forest machine or skidding system. It is proved that when planning logging operations on the slopes of thawing soils, the hydro geological and technical services of forestry enterprises and forestry organizations need to zone the sites according to the moisture criterion and classify them. In addition, it has been established that for each category of sites it is necessary to assess the operability of traffic routes-skidding lines and technological corridors, indicating the permissible ranges of track depth and maneuvering angle of forest vehicles or skidding systems. 

The bacterial community of the phyllosphere of Siberian larch (Larix sibirica Ledeb.) growing under conditions of severe technogenic pollution in the Norilsk industrial region has been studied. Using metabarcoding methods, the microbial composition of the needles was analyzed, which made it possible to identify the dominant bacterial taxa and assess their role in the adaptation of plants to extreme environmental conditions. The main dominant bacterial phyla in the larch needle samples were Proteobacteria, Actinobacteriota, Firmicutes, and Bacteroidota, which is consistent with their widespread distribution in various ecosystems and their important role in the functioning of microbial communities. Among the identified genera, the most common were Cutibacterium, Staphylococcus, Streptococcus, Corynebacterium, and Klebsiella.

egion has been studied. Using metabarcoding