Vegetation conditions and fuel materials on Kornati in connection with Kornati fire of 30th August 2007.

Abstract

Osim što ugrožavaju proizvodnju šumske biomase, požari mogu poremetiti i ekološku ravnotežu te narušiti trajno održivi razvoj. Uz to mogu imati i tragičnije posljedice kao što je to bilo na Kornatima u ljeto 2007. godine. U vezi s tim obavljena su istraživanja vegetacije i testiranje njene zapaljivosti i gorivosti. Testiranje zapaljivosti obavljeno je u laboratoriju u Makarskoj prema metodologiji koju je opisao Valette (1990). Samim uzorkovanjem na terenu odmah je uočeno da grmlje nije izgoreno, odnosno drvenasti dijelovi vegetacije debljine iznad 5 mm ostali su vitalni i živi. Suhi dijelovi travne vegetacije koji su zaklonjeni kamenom ostali su također neizgoreni. Iz rezultata testiranja vidljivo je da je vegetacija bila krajnje zapaljiva. Travna vegetacija imala je sadržaj vlage od 10 do 16 %, a vrijeme zapaljenja je bilo 2 s. Kod drvenaste vegetacije vrijeme zapaljenja kretalo se od 18 do 22 s, dok je sadržaj vlage bio od 13 do 53 %. Pokrovnost vegetacijom kretala se od 3425 kg/ha do 4948 kg/ha kod travne vegetacije i od 2180 kg/ha do 3425 kg/ha kod drvenaste vegetacije.Apart from endangering the production of forest biomass, fires may also disturb the ecological balance and disrupt permanent sustainable development. However, fires may have even more tragic consequences, as it was in the case of Kornati in the summer of 2007. Vegetation was investigated and its ignitability and flammability were tested. Ignitability was tested in the laboratory in Makarska using the methodology described by Valette (1990). Field sampling revealed that the shrubs were not burnt and that woody vegetation parts exceeding 5 mm in thickness remained vital and alive. The dry parts of grass vegetation sheltered by stones were also unaffected. Test results showed that the vegetation was extremely flammable. The humidity content of grass vegetation ranged from 10 to 16 % and the ignition time was 2 s. In woody vegetation the ignition time oscillated from 18 to 22 s, with humidity ranging from 13 to 53 %. Vegetation cover ranged from 3,425 kg/ha to 4,948 kg/ha in grass vegetation and from 2,180 kg/ha to 3,425 kg/ha in woody vegetation

    Similar works