5 research outputs found
Különbözõ erdészeti beavatkozások hatása egy pilisi gyertyános-tölgyes aljnövényzetére
Különböző erdészeti beavatkozások hatása egy pilisi gyertyános-tölgyes aljnövényzetére = The Effect of Different Forestry Treatments on the Understory Vegetation of a Sessile Oak–Hornbeam Forest
Canopy gaps are less susceptible to disturbance-related and invasive herbs than clear-cuts: Temporal changes in the understorey after experimental silvicultural treatments
Forest management has a major impact on the understorey vegetation, with the intensity and type of the applied
silvicultural treatments driving variable vegetation responses. We compared understorey variables across
different experimental silvicultural treatments in a temperate oak-hornbeam forest in Central Hungary. Five
treatment types were used in six replicates representing rotation and selection silvicultural systems: control (C),
clear-cutting (CC), gap-cutting (G), preparation cutting (P), and retention tree group (R). The response of several
understorey variables was investigated to the treatments in the first six years after their implementation in 2014.
We assessed how understorey variables change in response to different forestry treatments, how these re-
sponses vary with time, and how game exclusion affects them. We then evaluated how well the treatments can
preserve the forest character of the vegetation.
We found a large temporal variability in the understorey variables over the study period. In all cases, the
interventions led to an initial increase in species richness, followed by a decline later, where the regeneration
layer started to close. The regeneration layer grew most intensively in G and CC. At the end of the study, R had
the highest average species number, comprising a heterogeneous group of perennial forb species. The in-
terventions all resulted in a rapid increase in total herb layer cover, mainly in favour of graminoid and perennial
species. The extent of cover increase depended primarily on the amount of additional light received (CC > G > P
> R > C). Turnover and beta diversity values also decreased in a similar order. The effect of game exclusion was
especially pronounced in the case of the CC and G, where game browsing significantly slowed the regeneration
outside the fences. The most significant changes in almost all variables were in the CC. It had the highest number
of indicator species, many of them annual, disturbance-related, and invasive. G preserved the forest character of
the vegetation better and proved to be less susceptible to the mass appearance of disturbance-related and
invasive herbaceous species.
Increasing the share of continuous cover forestry methods is crucial to preserve the forest herb layer. Rotation
forestry with large cutting areas is not recommended or should be kept at low landscape rates, as these areas are
highly exposed to disturbance-related and invasive species. Leaving retention tree groups can be key to the
survival of numerous forest plant species
A lĂ©kalak Ă©s lĂ©kmĂ©ret hatása az erdei mikroklĂmára
Az Ă–kolĂłgiai KutatĂłközpont Ă©s a Pilisi ParkerdĹ‘ Zrt. 2018-ban indĂtotta el a Pilis LĂ©k KĂsĂ©rletet, amelynek cĂ©lja az örökerdĹ‘ ĂĽzemmĂłd során megfelelĹ‘ helyzetekben kialakĂtott kĂĽlönbözĹ‘ mĂ©retű Ă©s alakĂş lĂ©kek összehasonlĂtĂł vizsgálata, amellyel az ökolĂłgiai szempontbĂłl is fenntarthatĂł gazdálkodási gyakorlatok alkalmazását szeretnĂ©nk segĂteni. A Pilisszentkereszti ErdĂ©szet terĂĽletĂ©n találhatĂł kĂsĂ©rleti terĂĽleten harminc lĂ©kben vizsgáljuk azok mĂ©retĂ©nek Ă©s alakjának hatását az erdei mikroklĂmára, a talajra, a kocsánytalan tölgy felĂşjulására Ă©s kĂĽlönbözĹ‘ Ă©lĹ‘lĂ©nycsoportokra. A lĂ©knyitásokat követĹ‘ elsĹ‘ Ă©v eredmĂ©nyei alapján megállapĂtottuk, hogy az egy fahossznyi átmĂ©rĹ‘jű lĂ©kek az aljnövĂ©nyzet szintjĂ©ben fenn tudják tartani az erdĹ‘kre jellemzĹ‘ hűvös, párás, kiegyenlĂtett
környezeti viszonyokat. Ugyanakkor a lékek alakja és mérete jelentősen befolyásolja a cserjeszintben és az aljnövényzet szintjében mért hőmérsékletet, valamint a léknyitás hatására kialakuló fény- és talajnedvességtöbblet lékeken belüli eloszlását. A cikk a szerzők nemzetközi szakcikke (Horváth et al. 2023) alapján készült