Black cherry ( Prunus serotina Ehrh., Rosaceae) is a widespread invader of the European temperate forests and a significant component of the human-caused part of the global environmental changes. Its successful invasion results from a complex interaction between the species life traits and the recipient ecosystem attributes. While it has been recorded to develop spontaneously in numerous European countries, in Croatia information details on its population distribution, as well as its current status, are still missing. The individuals of P. serotina were found in the pedunculate oak (Quercus robur L.) forest regeneration area of Jastrebarsko forest management unit in 2018. This alerted us to start to monitor its spreading area, status and impact on the native plant species in a four-year period (2018-2021). In order to investigate the habitat characteristics, phytosociological approach was applied. In addition, the area was surveyed using an unmanned aerial vehicle (UAV) DJI Mavic 2 Pro and DJI Ground Station Pro. The results showed that P. serotina spread considerably in the regeneration area, which indicates its invasive character. It also caused alteration in current vegetation. Fast initial expansion of P. serotina in 2019 was slowed down in the next 2 years due to performed tending activities, suggesting mechanical measures could help to control its invasive spreading at an early stage of development. This research brought up the first record of the Prunus serotina species in pedunculate oak forest regeneration area of western Croatia with a recommendation to continue the monitoring survey in order to help prevent its spread in the future.
Šumske čistine (eng. forest clearings, forest gaps, canopy openings) čine regeneracijske oblike uravnoteženih i pretežito zrelih šumskih sastojina. Kao neizostavan dio dinamike razvoja strukturno stabilnih šumskih kompleksa te posljedica otvaranja sastojinskog sklopa, odlikuju se strukturnom i mikroklimatskom jedinstvenošću te konstantnom promijenjivošću (White i Pickett 1985, Runkle i Yetter 1987, Busing i White 1997, Schliemann i Bockheim 2011). Unatoč brojnim istraživanjima šumskih čistina diljem svijeta, nedovoljno poznavanje ovakvih oblika staništa na našem području, uz varijabilnost sindinamičkih procesa u odnosu na klimu i zemljopisni položaj, najveći su uzroci problematike njihove kategorizacije. Dodatni izazov na području Hrvatske predstavlja i njihova uloga u gospodarenju šumama unutar Natura 2000 mreže (NN 7/2006), zbog čega široko shvaćeni pojam „šumske čistine“ u vegetacijskom smislu čini, ne samo izazov u gospodarenju šumama, nego potencijalno i praktični problem u obliku provođenja mjera zaštite. S ciljem približavanja postojeće problematike njihovog definiranja, ovim je radom, na temelju primjenjivih dosadašnjih istraživanja, uspostavljena strukturna kategorizacija šumskih čistina s obzirom na podrijetlo, tip (oblik), veličinu, prostorni smještaj i vegetacijsku pripadnost prema Nacionalnoj klasifikaciji staništa Republike Hrvatske, uz prijedlog održivih mjera zaštite. Predložena kategorizacija, vegetacijska pripadnost, jednako kao i mjere zaštite, podložne su naknadnim izmjenama i/ili dopunama te mogu poslužiti kao temeljno polazište budućih istraživanja ovakvih oblika staništa naših prostora.
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