20.500.12556/DiRROS-24777 Osutost drevesnih krošenj v Sloveniji po letu 1991 s poudarkom na letu 2024 Tree crown defoliation in Slovenia since 1991, with particular emphasis on 2024 Več kot 30-letno vsakoletno spremljanje osutosti dreves na istih ploskvah Raven I v okviru programa ICP Forests omogoča dragocen vpogled v dolgo časovno vrsto spremljanja vitalnosti drevesnih vrst, ki je še posebno aktualno v času podnebnih sprememb, ko so ekstremni vremenski dogodki vse pogostejši. V pričujočem prispevku predstavljamo rezultate spremljanja stanja osutosti drevesnih krošenj na ploskvah Ravni I v obdobju 1991–2024 v Sloveniji, s poudarkom na zadnjem letu meritev – v letu 2024. Od leta 1991 se je povprečna osutost povečala za 14,2 % (s 16,6 % na 30,8 %). V letu 2024 je povprečna osutost iglavcev znašala 31,5 %, pri listavcih pa 30,3 %. Časovna vrsta povprečne osutosti drevesnih krošenj za več kot 30-letno obdobje kaže, da se je v obdobju 1991–2000 stanje osutosti krošenj slabšalo, med letoma 2000 in 2013 pa je bilo razmeroma stabilno. Na začetku obdobja 2014–2020 smo zaznali veliko povečanje osutosti drevesnih krošenj (2,2 %) zaradi žleda leta 2014, sledilo pa je umirjanje negativnega trenda poslabševanja stanja, tj. povečevanja osutosti. Veliko povečanje osutosti (za 3,8 %) smo ponovno zaznali med letoma 2020 in 2022, na kar je vplivala poletna suša v letu 2022, vplivale pa so tudi različne ujme, kot so vetrolomi in gradacije podlubnikov. V zadnjih dveh letih smo zaznali stagnacijo stanja osutosti. More than 30 years of annual monitoring of tree defoliation on the same Level I plots within the ICP Forests programme provides us with valuable insights into long-term tree species vitality monitoring, which is particularly relevant in times of climate change when extreme weather events are increasing in frequency. This article presents the results of the tree crown defoliation condition monitoring in Level I plots in Slovenia between 1991 and 2024, focusing especially on the last year of measurements, i.e. year 2024. Since 1991, the average defoliation level has increased by 14.2% (from 16.6% to 30.8%). In 2024, the average defoliation of conifers was 31.5%, while that of deciduous trees was 30.3%. The time series of average tree crown defoliation for the period of more than 30 years shows that crown defoliation deteriorated between 1991 and 2000, but remained relatively stable between 2000 and 2013. At the beginning of the 2014–2020 period, we observed a high increase in tree crown defoliation (2.2%) due to the 2014 ice storm, followed by a slowdown in the negative deterioration trend, i.e. an increase in defoliation. Between 2020 and 2022, we again observed a high increase in defoliation (3.8%), influenced by the summer drought in 2022 and various natural disasters such as windbreaks and bark beetle infestations. In the last two years, we have observed stagnation in the defoliation situation. stanje gozdov osutost drevesnih krošenj Raven I ICP Forests monitoring forest condition tree crown defoliation Level I ICP Forests monitoring true false true Slovenski jezik Angleški jezik Neznano 2025-12-18 10:00:06 2025-12-18 10:00:07 2025-12-20 04:07:08 0000-00-00 00:00:00 2025 0 0 str. 208-220 št. 7/8 Letn. 83 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-12-18 630*53 0017-2723 261995267 GV_7-8_2025_WEB-26-38.pdf GV_7-8_2025_WEB-26-38.pdf 1 B65B51AA36DEB69E59D2543D68CFED29 a41c7ccfc3997d7360aeccc4ed6214c9e40407723bcaf717bae5e90e2bba1f82 0e482d1c-dbf0-11f0-94a7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=37042 Zveza gozdarskih društev Slovenije Gozdarski vestnik 0 0 0