The structure of stands from different subassociations of a monodominant sessile oak forest (Quercetum petraeae Čer. et Jov. 1953.) in the area of northeastern Serbia before and after regeneration

Abstract

U radu se prikazuje izgrađenost očuvanih, visokih, zrelih, sastojina i mladih sastojina nastalih planskom obnovom ili spontanom razgradnjom istih u monodominantnim šumama kitnjaka (Quercetum petraeae et Jov. 1953.), iz dve subasocijacije tilietosum i typicum, na području Nacionalnog parka ,,Đerdap''. Prikaz zrelih sastojina se zasniva na podacima sa oglednih površina, prikupljanim 1992. godine, u periodu koji karakteriše pojava masovnog sušenja kitnjaka na navedenom području, i širom Evrope. U sastojinama, starim oko 150 godina u 1992. godini, u spratu drveća je bio zastupljen samo kitnjak. Sastojine su sa potpunim do gustim sklopom i imaju visoke iznose zapremine, a u strukturi po biološkom položaju, kvalitetu debla, razvijenosti krošnje i stepenu sušenja stabala među njima nema jasnijih razlika. Prikaz mladih sastojina se zasniva na podacima sa trajne ogledne površine, prikupljanim 2017. godine, kao i na podacima drugih autora. Izgrađenost mladih sastojina ukazuje da je u fazi obnove starih sastojina potrebno planirati različite uzgojne mere u različitim subasocijacijama monodominantne šume kitnjaka, da bi se očuvalo učešće kitnjaka u dovoljnoj brojnosti.This paper presents the structure of well-preserved, mature stands of seed origin and young stands that followed either after planned regeneration or spontaneously in the understory reinitiation stage, in monodominant sessile oak forests (Quercetum petraeae Čer. et Jov. 1953.) from two subassociations, tilietosum and typicum, in the territory of „Đerdap” National Park. The presentation of mature stands is based on the data collected from experimental plots in 1992, in the period characterized by the mass occurrence of sessile oak decline in this area, and across Europe. The stands were around 150 years old in 1992, and consisted only of sessile oak in the tree layer. The canopy closure of the stands was 0.7-0.8, with a large standing volume. There were no major differences between the stands regarding social classes, stem quality, crown development and crown condition. The presentation of young stands is based on the data collected in 2017 from a permanent experimental plot, as well as on the data from other authors. The structure of young stands indicates that different silvicultural measures need to be planned during the regeneration stage for different subassociations of the monodominant sessile oak forest in order to reach sufficient natural regeneration of sessile oak