Breeding Strategy of the Species of Genus Pinus in the Immission Region of the Ore Mountains

1987

S. 71-100

7 Abb., zahlr. Lit. Ang.

Unselbständiges Werk

200037468

The purpose of the study is to supplement the contemporary ecological concept of forest reconstruction with a genetic approach. The author divides the process of forest reconstruction in the regions devastated by immission into three phases: 1. ecological phase, consisting inthe identification of environmental conditions and their effect on forest tree species, the methods of elimination of the impact of immissions on the atmosphere and the forest soil, and the seeking of adequate countermeasures; 2. genetic phase, comprising the selection of varieties which have shown good resistance in contemporary immission concentrations and the improvement of their resistance by the repetition of their generations in situ; the selection and hybridization methods are intended to propagate the heterozygotes in tree species population of higher resistance; 3. the phase of ecology and genetics interaction, i.e. the break-up of the reconstruction process into individual succession phases. The first phase comprises the planting of devastated sites with pioneer species of high genettic flexibility which have proved their high resistance, and their use regardless of variety and provenance. The next phase consists in the return of the initial climax tree species of high genetic fitness to their initial sites. The first phase will be maintained until the conditions for the utilization of climax species have been created. The only exception will consists in the spruce whih will be introduced in the form of pffsprings of tolerant individuals into pioneer cultures at an ever increasing rate. The forest form selected for the introduction of a mixture of pioneer coniferous species to immission- devastated sites was the boreal taiga with a mixture of coniferous species, comprising mostly the resistant varietie of genus Pinus, with an admixture of suitable broad-leaved species.