A good part of the forest that survived active logging during the previous period of industrialization is now in remote areas: on steep slopes, in waterlogged or permafrost areas. There, especially on the slopes, the use of land disproportionately affects ecological processes, specifically hydrological (e.g., peak waves, suspended load, etc.). Organizing off-trail transport of log timber under such conditions is a challenge associated with specific difficulties. Almost any cutting area has sites of different capacity (stand volume per ha), which require the use of high flotation machines and have habitats that cannot be disturbed. The frequency of trips to cutting areas increases with the stand volume in these areas, but there are areas that machines have to drive round. Areas with weak soils need forest machines to carry less weight or to use additional attachments to hold the load. Unfavourable grades need the bundle to be limited in weight to maintain the tractive effort of a skidder. Because this activity is carried out with a high impact on ecology, it calls for a mathematical model and technique to evaluate logging routes and to assess the impact that logging activities have on the forest soil and subsoil and on the forest in general. This paper is devoted to the creation and justification of such a technique and offers an algorithm for careful forest use and forest-friendly logging.

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The transportation of forestry products is performed over long distances and is quite expensive, which limits the development of biofuel plants in Russia and around the world. The use of timber terminals contributes to transportation cost reduction and mitigates negative environmental impacts. This work aims to analyze various technological solutions for optimization of forestry products processing at temporary terminals and cost reduction of transportation, shipping, and wood treatment. The work presents a discussion on the technological and economic possibilities of the mobile pellet plant, the mobile essential oil production plant, and an enhanced autonomous electric generator system. It is shown that the use of mobile plants for obtaining pellets and essential oils allows processing wood residues at the terminal, which reduces the cost of transportation and shipment of raw materials and improves the quality of the finished products. The current study also examines some of the modern scanning technologies used to detect log defects and obtain complete biometric information in real time while assessing the productivity of wood processing operations. The results of the study can be used to develop efficient movable timber terminals.

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Most forestry machinery today has a wheel-driven engine, and its tyre pressure has a significant impact on the compaction and degradation of the forest soil, causing environmental damages. Not only the durability of the tyres but also the driving characteristics and productivity of wheeled forest machines depend on the correct choice of pressure and competent operation. This work aims to analyse modern tyre pressure control technologies to develop an automated tyre pressure control system for wheeled forest machinery and lower the environmental impact. A new tyre pressure control system in forest machines was developed using a PressurePro solution, which contributes to a lower negative influence on the soil and reduces expenses for diagnostics and fuel. The study results of the tyre-to-ground contact pressure show that the installation of an automatic tyre pressure control system leads to its decrease by 20%. However, as the number of passes increases, the pressure might slightly increase. The study of humus content and soil compaction demonstrates that reduced tyre pressure and its automatic control contribute to a minimal reduction in humus content and soil compaction over time. Installation of the tyre pressure and temperature control system on forestry machines allows the system to be implemented quickly due to the simplicity of installation and operation.