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Arheološki les - njegove lastnosti in raziskovalni potencial
Čufar, Katarina ; Tišler, Vesna, 1947- ; Gorišek, Željko
Raziskali smo osnovne fizikalne in kemične lastnosti arheološkega "mokrega" lesa z Ljubljanskega barja, ki se je ohranil v mokrih tleh ali pod vodo. Vzorci lesa hrasta (Quercus sp.), jesena (Fraxinus ...sp.), jelše (Alnus glutinosa), bukve (Fagus sylvatica) in javorja (Acer sp.) so bili ostanki kolov iz prazgodovinskih koliščarskih naselbin iz 3. in 4. tisočletja pr. n. š. Vlažnost lesa nad 500 % in drastičen upad gostote v primerjavi z normalnim lesom kaže na visoko stopnjo razkroja celičnih sten v lesu. Krčenje je močno presegalo krčenje normalnega lesa. Kemične analize arheološkega jesena so pokazale drastično povečan delež lignina in zmanjšan delež celuloze in hemiceluloz. Rezultati predstavljajo osnovo za izbiro primernih načinov ohranitve arheološkega lesa iz Ljubljanskega barja in drugih najdišč v Sloveniji.
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