20.500.12556/RUL-68601 Les tika (Tectona grandis L.) The wood of teak (Tectona grandis L.) Tikovina (Tectona granids L.) spada med najbolj dragocene in zaželene lesne vrste. Ker lesa tika z naravnih rastišč v JV Aziji primanjkuje, se na trgu v glavnem pojavlja les s plantaž z različnih območij tropskega pasu. Podajamo pregled in primerjavo lastnosti lesa iz naravnih sestojev in s plantaž. Tikovino iz naravnih sestojev odlikuje velik delež intenzivno obarvane jedrovine z večjimi količinami ekstraktivnih snovi med katerimi so vodoodbojni kavčuk ter biološko aktivni lapahol, deoksilapahol, 2-metilantrakinon (tektokinon) in 2-hidroksimetilantrakinon. Jedrovino tika odlikuje dekorativnost, visoka naravna trajnost in ugodna dimenzijska stabilnost. Za les s plantaž je značilna hitra rast, manjše dimenzije debel ter velik delež beljave in juvenilnega lesa. Ojedritev je lahko manj intenzivna, kar se odraža predvsem v slabši naravni trajnosti. Lastnosti lesa s plantaž niso obvezno slabše kot lastnosti lesa iz naravnih sestojev, so pa bolj variabilne. Teak (Tectona grandis L.) belongs to most precious and desired wood species. Because of reduced supply of teak wood from natural forests in Southeast Asia,mainly the plantation wood from different tropical regions is available on the market. We present the properties of nature grown teak wood compared tothose of wood from the plantations. Teak wood from natural forests generallycontains a greater portion of coloured heartwood containing hydrophobic caoutchouc and high content of biologically active extractives like lapachol, deoxylapachol, 2 methylanthraquinone (tectoquinone) and 2-hydroxymethylanthraquinone. The heartwood of teak is distinguished by its decorative appearance, high natural durability and dimensional stability. Trees from plantations are usually fast grown, have smaller stems and high proportion of sapwood and juvenile wood. Heartwood-formation can be less intensive which leads to reduced natural durability. The wood from plantations is not necessarily of lower quality, but it is likely more variable than the wood form natural sites. Tectona grandis tik lastnosti lesa plantažni les true false false Zveza lesarjev Slovenije: GZS, Združenje lesarstva Slovenski jezik Neznan jezik Delo ni kategorizirano 2015-07-10 21:08:24 2015-07-10 21:08:24 2022-08-01 12:50:39 0000-00-00 00:00:00 2008 0 0 Str. 136-141 št. 4 Let. 60 2008 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*174 Tectona grandis 0024-1067 1632137 Budija-Cufar-Les_2008_tik.pdf Budija-Cufar-Les_2008_tik.pdf 1 8BC36E0C9323059F6888FC3C9D3F685D ac30bd44c80b940b7382aeeaef6d720fe1e7b743ebf78eaaf0b063b7c690509b 65eaa12e-a1b3-11eb-a523-00155dcfd717 20.500.12556/rul/0d9672c2-0b4d-4871-8fe5-9acc67cbcd84 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=100802 Biotehniška fakulteta 0 0 0