Composition and productivity of forests in tectonic nodes in the Arkhangelsk region

The purpose of the work is to study the influence of the geological component, in particular tectonic knots on the rock composition and productivity of stands of the Arkhangelsk region. Tectonic knots (hereinafter referred to as knots) were distinguished by a set of geophysical data, a hydraulic network and a mesorelief. Knots are the site of the suppression of 2 or more deep faults of the Earth's crust, in which the fragmentation of the Earth's crust is increased. As the number of intersecting faults increases, the permeability of the Earth's crust increases, which leads to increased geophysical anomalies, deep degassing, and changes in the structure of the baric field. In total, 3 knots with a significant area and fragmentation of the Earth's crust were studied. The initial forest management data was the forest management plan and tax descriptions for 1995. The rock composition was studied in 3 knots on an area of more than 11,000 km2, and the productivity of pine forests was investigated in the Velsko-Ustyansk knot. A reliable direct correlation of the proportion of spruce with the geomorphometric parameters of the Kozhezersky knot was revealed, which is associated with an improvement in soil and soil conditions due to improved drainage by means of a high dissection index. The inverse correlation of the proportion of pine and birch in this node with the same parameters is due to the displacement of these species by spruce. The direct correlation of the proportion of marshes with the height of the terrain in the Velsko-Ustyansky knot is most likely due to the widespread distribution of moraine sand deposits and less precipitation in the center of the knot, since the relief is less pronounced than in Kozhezersk. The influence of the VelskoUstyansky knot on increasing pine productivity is no more than 10% and is expressed in an increase in height, diameter, or both by 1-2 m and 1-2 cm, respectively, which is associated with a decrease in precipitation in the center of the knot and an improvement in soil and hydrological conditions. The data obtained allow us to talk about the possible influence of tectonic knots on the rock composition and productivity of coniferous plantations, by changing climatic and geoformometric parameters.

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