부산대학교 도서관

Bamboo is the fastest growing plant currently known on earth, a property that enables it to be the best alternative as a future source of wood fiber. This study investigated the effect of site and culm height on the physical and chemical properties of Yushania alpina culms grown in Ethiopia. Matured Yushania alpina 3 to 5-year-old samples were harvested from Hagere-Selam and Rebu-Gebeya sites. The culms were subdivided into three equal lengths (bottom, middle, and top), and the variations in physical and chemical properties between the two sites and the culm heights of Yushania alpina were investigated. The results showed that the average values of MC, basic density, tangential and longitudinal shrinkage of Yushania alpina culms for Hagere-Selam and Rebu-Gebeya sites were (91.78 and 80.32 %), (0.65 and 0.63 g/[cm.sup.3]), (6.63 and 5.84 %) and (0.63 and 0.56 %), respectively. The average values of cellulose, lignin, extractive and ash contents in the culms for Hagere-Selam and Rebu-Gebeya sites were (52.84 and 50.71 %), (26.55, and 26.04 %), (8.41 and 8.02 %) and (1.95 and 2.17 %), respectively. The results revealed that the site affected the MC, basic density, cellulose, lignin, extractive, and ash contents of Yushania alpina culms but not the tangential and longitudinal shrinkage. The culm height of Yushania alpina affected MC, basic density, tangential shrinkage, longitudinal shrinkage, cellulose, lignin, extractive, and ash contents. In the case of both sites, the highest percentages of MC, tangential and longitudinal shrinkage, and ash content were observed at the base and lowest at the top of the culms. On the contrary, both sites observed the highest magnitude of basic density, cellulose and extractive at the top and lowest at the base of the culms. The variations in physical and chemical properties at different sites and culm heights influence the utilization of Yushania alpina culms for industries and end products. KEYWORDS: bamboo (Yushania alpina), basic density, cellulose, lignin, moisture content, shrinkage Bambus je trenutacno najbrze rastuca biljka u svijetu, sto je cini najboljom alternativom za buduci izvor drvnih vlakana. Ovom je studijom istrazivan utjecaj stanista i visine bambusa Yushania alpina, uzgojenoga u Etiopiji, na fizicka i kemijska svojstva njegove stabljike. Uzorci Yushania alpina stari tri do pet godina skupljeni su sa stanista Hagere-Selam i Rebu-Gebeya. Stabljike su podijeljene na tri jednake duljine (baza, sredina i vrh) na kojima su istrazivane varijacije fizickih i kemijskih svojstava stabljike s obzirom na dva stanista i visinu bambusa. Rezultati su pokazali da su prosjecne vrijednosti sadrzaja vode, gustoce te tangentnoga i uzduznog utezanja stabljike Yushania alpina sa stanista Hagere-Selam i Rebu-Gebeya bile 91,78 i 80,32 %; 0,65 i 0,63 g/[cm.sup.3]; 6,63 i 5,84 % te 0,63 i 0,56 %, a prosjecne vrijednosti sadrzaja celuloze, lignina, ekstraktiva i pepela sa stanista Hagere-Selam i Rebu-Gebeya bile su 52,84 i 50,71 %; 26,55 i 26,04 %; 8,41 i 8,02 % te 1,95 i 2,17 %. Rezultati su pokazali da je staniste utjecalo na sadrzaj vode, gustocu te sadrzaj celuloze, lignina, ekstraktiva i pepela u stabljikama Yushania alpina, ali ne i na tangentno i uzduzno utezanje. Visina stabljike Yushania alpina utjecala je na sadrzaj vode, gustocu, tangentno i uzduzno utezanje te na sadrzaj celuloze, lignina, ekstraktiva i pepela. Za oba stanista utvrden je najveci sadrzaj vode, tangentno i uzduzno utezanje te sadrzaj pepela u bazi stabljike, a najmanji u vrhu stabljike. Nadalje, u vrhu stabljike s oba stanista primijecena je najveca gustoca, sadrzaj celuloze i ekstraktiva, a najmanje su vrijednosti izmjerene u bazi stabljike. Varijacije fizickih i mehanickih svojstava s obzirom na staniste i visinu stabljike utjecu na upotrebu stabljike Yushania alpina u industriji i za zavrsne proizvode. KLJUCNE RIJECI: bambus (Yushania alpina), gustoca, celuloza, lignin, sadrzaj vode, utezanje
1 INTRODUCTION 1. UVOD Bamboo is the fastest growing plant currently known on earth, a property that enables it to be the best alternative as a future source of wood [...]