Variation and interrelation of taxation indicators of European spruce plus trees in the clone archive in the Nizhny Novgorod region

We studied the variability and correlation of phenotypic manifestations of the taxation indicators of European spruce (Picea abies (L.) Karst.) plus trees represented by their vegetative offspring in the clone archive no. 3 on the territory of the Semenovsky District Forestry of the Nizhny Novgorod region, which was established in 1984. Planting was carried out with grafted seedlings at the age of 2 years, the source of the graft for which were plus trees growing in natural plantings of the same region with types of forest growing conditions B2 and B3 . At the time of selection, their age reached 60–140 years, and the taxation indicators were: height – 24–70 m; diameter – 24–35 cm. The seating arrangement was 3 3 m, the clone mixing scheme was ordinary with the initial repeatability of each orthet by 3–12 ramets. The initial area was 0.4 hectares, the type of forest conditions on it corresponded to category B2 . The relief of the selected area is flat with gray forest soils. The object is assigned to the area of coniferous-deciduous (mixed) forests of the European part of the Russian Federation and is included in the zone of coniferous-deciduous forests. The purpose of the study is to assess the nature and form of manifestation of variability and correlation of taxation indicators of European spruce plus trees. The actual material was collected by a stationary field method with a continuous enumeration of 154 trees in compliance with the principle of the only logical difference, typicality, suitability, reliability and expediency of the experiment. The heterogeneity of the vegetative offspring of plus-sized spruce trees in terms of taxation indicators was noted, which manifested itself both at the level of differences between groups of clones of the same name and within each of them. A correlation was recorded between the analyzed parameters of the stem part of the accounting trees placed in the clone archive no. 3.