The quality of wood of drained north-taiga pine forests of Arkhangelsk Oblast, determined by express method

The study of the wood quality in the drained pine stand was carried out on the territory of the north taiga of Arkhangelsk Oblast, which belongs to the green zone of the city of Arkhangelsk and the Arctic zone of the Russian Federation. Repeated measurements of forest inventory parameters were carried out on 6 permanent sample plots affected by melioration since 1974 and reconstruction of the drainage network in 1990. Before drainage, a swampy pine stands of the Vb bonitet class grew on them. At present, medium-aged scots pine (Pinus sylvestris L.) stands of shrubby sphagnum forest type, IV bonitet class, grow on the drained area. For half of the plots, it is possible to recommend thinning according to the current Russian Rules of forest care (2020). Some of the trees meet the requirements for the aviation lumber wood quality. For a visual simultaneous analysis of the drainage network quality impact, the location of objects relative to the drainage network and the air temperature in abnormally hot years, diagrams of changes in the average indicators of the width of the annual increment and the wood density in the drained pine stands by year are constructed. Similar diagrams are constructed on the basis of measuring the model tree cores at different relative heights of the trunk. This analytical approach has been applied for the first time. It is suggested that in 10 years the inventory parameters of all facilities will meet the requirements for the thinning purpose, and the wood quality will increase on average, for which it is recommended to reconstruct the channels.