The interdependence of the parameters of the needles of the prickly spruce in determining its dust-holding ability

The correlation and regression of linear parameters of the needles of the blue prickly spruce (Picea pungens Engelm. f. glauca) forming the leaf surface of trees and ensuring the realization of their dust-retaining ability were investigated. The relevance of the work is determined by the urgent need to optimize the parameters of the air basin of megacities, among which Nizhny Novgorod belongs, including reducing the level of dustiness of the air basin. We proceeded from the fact that the solution of this problem lies in the plane of creating urban landscaping systems from the most adapted and effective representatives of the local dendroflora and exotics, among which are representatives of the genus Spruce (Picea A. Dietr.), and in their composition the prickly blue spruce (Picea pungens Engelm. f. glauca). The aim of the study is to identify the correlation and regression of morphological characteristics of the leaf apparatus of the prickly spruce in connection with the determination of its dust–retaining ability. The object of the research were reproductively mature trees of the same age of prickly spruce, growing in three functional zones of the city with different levels of anthropogenic pollution. According to the current forest-growing zoning, the territory of the deployment of experimental plots belongs to the zone of coniferous-deciduous forests, coniferous-deciduous forest area of the European part of the Russian Federation (3 forest-growing area). The work was carried out in the spring of 2023. field stationary and laboratory methods in compliance with the principle of the only logical difference and the basic requirements for the organization of experience: typicality, suitability, expediency and reliability. The nature of the manifestation, orientation and closeness of the interdependence between the considered signs of the leaf apparatus of the prickly spruce are revealed. A wide range of values of paired correlation coefficients is noted. A sign-positive, reliable relationship was established between the length of the needles and the surface area of the individual needles (r±mr = 0.691±0.095), as well as with the mass of dust in the flushing from the surface of the needles in a separate sample (r±mr = 0.310±0.125). The fundamental correspondence of the results of regression analysis to the obtained estimates of correlations is recorded.

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