{"id":5056,"date":"2023-10-13T13:53:00","date_gmt":"2023-10-13T13:53:00","guid":{"rendered":"https:\/\/elc.ba\/?p=5056"},"modified":"2025-10-08T12:43:52","modified_gmt":"2025-10-08T12:43:52","slug":"the-process-by-which-wood-is-produced-in-trees","status":"publish","type":"post","link":"https:\/\/elc.ba\/bs\/2023\/10\/13\/the-process-by-which-wood-is-produced-in-trees\/","title":{"rendered":"Tvrdo i mehko drvo"},"content":{"rendered":"<p>Dobro je poznata \u010dinjenica da drvo potje\u010de od drve\u0107a. Ono \u0161to nije \u010desto vidljivo je sastav drveta i pojedina\u010dne komponente koje \u010dine bilo koji komadi\u0107 drvene gra\u0111e. Za razliku od komada pjenaste plo\u010de, MDF-a ili drugog umjetnog materijala, drvo je organski materijal s raznim karakteristikama koje vrijedi nau\u010diti. <\/p>\n\n\n\n<p><strong>TVRDO I MEHKO DRVO <\/strong><\/p>\n\n\n\n<p>Izraz \"tvrdo drvo\" ili \"mehko drvo\" pru\u017ea neposrednu i \u0161iroku razliku izme\u0111u razli\u010ditih vrsta drve\u0107a (i drveta). To je pomalo obmanjuju\u0107e, jer se taj izraz odnosi na podjelu kritosemenki (cvjetnice poput javora, hrasta ili ru\u017einog drveta) i \u010detinja\u010da (drve\u0107e s konusima poput bora, smreke ili jele). Tvrdo drve\u0107e (kritosemenke) ima li\u0161\u0107e \u0161irokog lista i obi\u010dno je listopadno - to jest, li\u0161\u0107e im otpada u jesen. (Me\u0111utim, mnoge tropske vrste tvrdog drveta su zimzelene - zadr\u017eavaju li\u0161\u0107e tijekom cijele godine.) Pored toga, drve\u0107e tvrdog drveta ima razgranatu ili podijeljenu strukturu debla koja se naziva dendriti\u010dni oblik.<\/p>\n\n\n\n<p>Mehko drvo (\u010detinja\u010de) obi\u010dno ima li\u0161\u0107e poput igle ili ljuske, ali u nekim rijetkim slu\u010dajevima, poput Kaurija, mo\u017ee imati vrlo guste, ravne listove (Agathis australis). Dok je ve\u0107ina drve\u0107a mekog drve\u0107a zimzeleno, neki \u010detinja\u010di, poput ari\u0161a ili \u010dempresa, odbacuju li\u0161\u0107e u jesen (otuda i zajedni\u010dki naziv \u201e\u0107elavi \u010dempres\u201c). \u010cetinari obi\u010dno imaju jedno dominantno ravno deblo s manjim bo\u010dnim granama, koje se nazivaju ranijim oblikom - ova navika rasta u obliku konusa poma\u017ee drve\u0107u u umjerenoj klimi u prolijevanju snijega. <\/p>\n\n\n\n<p>Opet, neke \u010detinja\u010de, poput libanonskog cedra, izuzetak su od ovog uzorka rasta (Cedrus libani). Nesigurnost u ozna\u010davanju javlja se jer drvo kritosemenke nije uvijek tvrdo (istaknuti primjer je balza, koja je pravno poznata kao tvrdo drvo), dok drvo \u010detinja\u010da nije uvijek mekano (primjer relativno tvrdog \u010detinarskog drveta bilo bi tisa). Me\u0111utim, op\u0107enito je tvrdo drvo tvr\u0111e od mekog, a taj je izraz jo\u0161 uvijek koristan za razlikovanje dvije \u0161iroke klase drve\u0107a i njihovih karakteristika drveta. <\/p>\n\n\n\n<p><strong>RAST DRVE\u0106A<\/strong><\/p>\n\n\n\n<p> Za po\u010detak zamislite da imamo malenu malu mladicu koja tek kre\u0107e na put da postane veli\u010danstveno drvo. Osim osnova korijenja, glavne stabljike (stabla), li\u0161\u0107a i grana, na vrhovima stabljika i korijena nalaze se to\u010dke uspona zvane apikalni meristemi. Vertikalni rast drve\u0107a olak\u0161avaju ove ta\u010dke uspona dijeljenjem \u0107elija. Uz to, tanki sloj ili omota\u010d koji se naziva vaskularni kambij ili bo\u010dni meristem - koji se obi\u010dno naziva kambij - nalazi se izme\u0111u kore i unutarnjeg drveta. Ovaj mikroskopski, naizgled magi\u010dni sloj odgovoran je za gotovo sav horizontalni razvoj drveta. Kambij se sastoji od reproduktivnih \u0107elija koje dijele \u0107elije oblikuju novu koru prema van, a tako\u0111er i novo drvo prema unutra. Sezonska aktivnost rasta kambija je ono \u0161to uzrokuje prstenove rasta vidljive u drvu: u umjerenim podru\u010djima kambij je najaktivniji u prolje\u0107e (ovo drvo se ponekad naziva i prolje\u0107e ili rano drvo), usporavaju\u0107i se ljeti (ovo drvo se ponekad naziva (kao letnje ili kasno drvo), a zimi potpuno prestaje rasti. Ove varijacije u ciklusima rasta iz godine u godinu rezultiraju godi\u0161njim prstenovima, koji su prili\u010dno pouzdana mjera starosti drveta.<\/p>","protected":false},"excerpt":{"rendered":"<p>Dobro je poznata \u010dinjenica da drvo potje\u010de od drve\u0107a. Ono \u0161to se \u010desto ne vidi je sastav drveta <a class=\"tzreadmore simple-ajax-popup-align-top\" href=\"https:\/\/elc.ba\/bs\/2023\/10\/13\/the-process-by-which-wood-is-produced-in-trees\/\">Read More<\/a><\/p>","protected":false},"author":1,"featured_media":4677,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-5056","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hardwoods and Softwoods - El Company d.o.o<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elc.ba\/bs\/2023\/10\/13\/the-process-by-which-wood-is-produced-in-trees\/\" \/>\n<meta property=\"og:locale\" content=\"bs_BA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hardwoods and Softwoods - El Company d.o.o\" \/>\n<meta property=\"og:description\" content=\"It is a well-known fact that wood is derived from trees. 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