The aim of the research is to assess the impact of technogenic habitats on the structure of the Pinus sylvestris seedfall. Scheme of observations: we analyzed the P. sylvestris juveniles collected in two forest overgrown ash dumps in the Middle Urals. In each ash dump we compared seedfall at recultivated (applying the substrate) and non-recultivated areas. A control seedfall group that grew under the canopy of pine forest on natural soil was used. The results were assessed by a dispersion analysis. Variability associated with an absolute age of the plants was taken into account. The seedfalls from the different ash dumps do not differ in main morphological characteristics (weight of shoots and roots and underground parts, height of shoots, root length, density of absorbing roots at conducting roots, root/shoot mass ratio). The seedfalls from recultivated and not recultivated sites do not differ or differ little. Contrasting difference was established in terms of the development rates of ash dumps seedfalls and seedfalls from a natural pine forest. Plants’ shoots and roots of ash dumps are 1,5-2,5 times higher than the ones from natural forest. It was found that seedfalls in different habitats vary greatly in weight. The seedfalls biomass in ash dumps is 2-3 times greater than in natural forests. A slow growth of seedfalls in natural forests, apparently associated with the effects of coenosis press, is the result of competition and the impact of mature trees. It was concluded that by 40-50 years of ecosystems age at the ash dumps the impact of technogenic substrates is not critical for the development of P. sylvestris juveniles.
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