All rights reserved Sustainable forestry volume: 57-58 startpage: 50 endpage: 59 https://unilib.phaidrabg.rs/o:9451 ISSN: 1821-1046 2008 The changes in the internal structure of Pseudotsuga menziesii (Mirb.) Franco needles under the influence of air-pollution Promene u unutrašnjoj strukturi četina Pseudotsuga menziesii (Mirb.) Franco pod uticajem aerozagađenja eng application/pdf 4766384 bytes info:eu-repo/semantics/article Veselinović, Milorad Mitrović, Suzana Čule, Nevena Golubović-Ćurguz, Vesna Rakonjac, Ljubinko Ratknić, Mihailo Dražić, Dragana Abstract: The deposits of Kolubara open-pit mining fields are under the direct influence of the largest power plants of this type in our country. This area is under the influence of air pollution due to the lignite mine exploitation, combustion and transport. The scope of our research has been aimed at the Pseudotsuga menziesii (Mirb.) Franco resistance to air-pollution; taking into consideration the fact that the foliage represents the primary zone under the negative effect of air-pollutants on plant species, the tests have been conducted in order to establish how pollution affects the internal structure of Douglas fir needles. The paper presents the results obtained by stereologic analyses of volume-density of mesophyllic cells, intercellular spaces, central cylinder, resin channels and vascular bundles through the cross-section of Douglas fir needles subjected to the direct influence of air- pollution in the area of Kolubara open-pit mine, as well as those from control localities on Jelova Gora and Juhor Mountain. Based on the research results, the decrease in volume density of chlorenchyma and the increase of intercellular spaces are reported in Douglas fir needles in polluted area as opposed to those in control locality, and the differences are statistically justifiable. Izvod: Odlagališta površinskih kopova na području PK Kolubarai se nalaze pod neposrednim uticajem najvećih energetskih postrojenja ovog tipa u našoj zemlji. Kao posledica eksploatacije, transporta i sagorevanja lignita ovo područje je pod svakodnevnim uticajem aerozagađenja U okviru naših istraživanja koja su usmerena na istraživanja otpornosti vrste Pseudotsuga menziesii (Mirb.) Franco na aerozagađenja, a obzirom da je za delovanje vazdušnih polutanata lisna površina primarna zona negativnog uticaja na biljne vrste, vršena su i ispitivanja kako zagađenje utiče na unutrašnju strukturu četina. U radu su prikazani rezultati stereoloških ispitivanja volumenskih gustina mezofila ćelija, intercelularnih prostora, centralnog cilindra, smonih kanala i provodnih snopića na preseku četina sa područja PK Kolubara koji su pod direktnim uticajem aerozagađenja i sa kontrolnih površina na Jelovoj gori i planini Juhor. Na osnovu rezultata istraživanja utvrđeno je smanjenje volumenske gustine hlorenhima i povećanje intercelularnih prostora kod četina duglazije u zagađenoj sredini u odnosu na kontrolne i te razlike su statistički opravdane. Key words: air-pollution, biological recultivation by afforestation, needle anatomy Ključne reči: aerozagađenje, biološka rekultivacija pošumljavanjem, anatomija četina. Beograd: Institut za šumarstvo