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INDONESIA
Jurnal Ilmu Kehutanan
Published by Universitas Gadjah Mada
ISSN : 01264451     EISSN : 24773751     DOI : https://doi.org/10.22146/jik.28284
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management Environmental Science
Focusing on aspects of forestry and environments, both basic and applied. The Journal intended as a medium for communicating and motivating research activities through scientific papers, including research papers, short communications, and reviews
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ekologi
Articles 6 Documents
 1 
Search results for , issue "Vol 3, No 2 (2009)" : 6 Documents clear
Pengukuran Kadar Ekstraktif dan Sifat Warna pada Kayu Teras Jati Doreng (Tectona grandis) Ganis Lukmandaru
Jurnal Ilmu Kehutanan Vol 3, No 2 (2009)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (234.5 KB) | DOI: 10.22146/jik.1045

Abstract

Measurement of Extractive Content and Color properties on Black-streaked Heartwood of Teak (Tectona grandis)Teak (Tectona grandis L.f) in certain areas of Java usually has black streaked heartwood or has been known as "doreng". In general, the color of wood is related to the kinds and amounts of extractives, therefore, black streak that appeared on the heartwood was studied by means of color measurements and the determination of extractive content. The study was made with 13 trees of black streaked heartwood and 5 trees of normal heartwood. The wood powder (40-60 mesh) was extracted successively with ethanol-benzene (1:2, v/v) for 8 h and hot water for 3 h. The used system of color measurements was CIEL*a*b* which represents brightness, redness and yellowness. The discolored wood was contained substantially more ethanol-benzene soluble extractive content (12 - 22%) than did the normal heartwood (7 - 11%). The yield differences of hot-water soluble extracts were not as pronounced. Beside the brightness (L*), the differences in redness (a*) and yellowness (b*) between the normal (L* = 51-61, a* = 4 to 7, b* = 24 to 28) and black streaked heartwood (L* = 42-51, a* = 6 to 9, b* = 20 to 25) before the extraction, were notable. The total color differences ( E*) before and after extractions, however, were not significantly differed between the discolored ( E* = 6 to 13) and normal heartwood ( E* = 5 to 11) parts. Correlation analysis revealed strong correlations between ethanol-benzene soluble extractive content with L* (r = -0.97) and b* (r = -0.94). The hot-water soluble extract was moderately correlated with a* (r = 0.54) and the difference in redness ( a*) before and after extractions (r = 0.75).
Evaluasi Pertumbuhan Uji Provenans Eucalyptus urophylla S.T. Blake Umur 20 Tahun di Lad Krating, Chachoengsao, Thailand) Indi Hendraswari; Suree Bhumibhamon
Jurnal Ilmu Kehutanan Vol 3, No 2 (2009)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (13623.961 KB) | DOI: 10.22146/jik.1046

Abstract

Evaluation of Provenance Trial of Eucalyptus urophylla S.T. Blake Growth Age 20-Year-old in Lad Krating , Chachoengsao Province, ThailandGrowth characteristics of a wide range of provenance trial of Eucalyptus urophylla established at Lad Krating Plantation, Chachoengsao Province were assessed at 20 years of age. The trial was established to ascertain the extent of variation within the species, identify promising sources for the immediate seed supply and provide information on superior sources for selection. The trial consisted of 18 provenances representing six islands in Indonesia, viz. Flores, Lomblen, Pantar, Alor, Wetar, and Timor. Results from the present study indicated that there were significant differences in survival, tree height, clear bole, diameter at 10 cm above ground level (D10), and diameter at breast height (Dbh) among provenances. Meanwhile, the difference in crown diameter among provenances was insignificant. The present results recommended 6 provenances, viz. Mt. Lewotobi (Flores), Mt. Wasbilla (Pantar), Mt. Kerbau (Lomblen), Mt. Lewerok (Flores), Ampui (Alor), and Mt. Lakaan (Timor) as the best performing provenances for the next selection process and the most promising seed sources to be used in increasing the plantation productivity at Lad Krating.
Potensi Kayu Perkakas dan Kayu Bakar Jenis Jati (Tectona grandis) di Hutan Rakyat Desa Natah, Gunung Kidul Ris Hadi Purwanto; Dian Asih Kurniasari
Jurnal Ilmu Kehutanan Vol 3, No 2 (2009)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (12314.298 KB) | DOI: 10.22146/jik.1510

Abstract

Potentials  of Merchantable Timber and Firewod of Teak (Tectona grandis) in Natah Village Community Forest , GunungkidulThe potential of merchantable timber and firewod of teak (Tectona grandis) in Desa Natah community forest was estimated by developing allometric equations method. To establish the allometric equation 350 sample trees were measured to determine the relationships between tree height (H) and diameter breast height (D). Thirty trees of various sizes were cut to measure the merchantable timber and firewood volume. The raw merchantable timber volume of teak in the community forest was defined as the ligneous material contained in the bole and branches which both with a diameter of at least 10cm. The result showed that D (taken at about 1.3m above the ground) was a good predictor of H with r2 over 0.9672. When D was combined with H, r2 was improved somewhat for the merchantable timber volume, suggesting the growth patterns of tree dimensions were colesy interdependent. A standing stock of the merchantable timber and firewood volume of teak in the community forest was then estimated based on the allometric relations. Proportions of the merchantable timber and firewood volume were 66.91% and 33.09% of total wood volume per tree, respectively. The potential of merchantable timber and firewood volume in these community forest were 13.501 m3/ha and 8.686 m3/ha, respectively, with a basal area of 1.887 m2/ha. Based on the basal area, Desa Natah community forests of teak could be classified into extremely sparse of stands category.
Arahan Penggunaan Lahan untuk Pengendalian Erosi Tanah di Sub-DAS Wuryantoro DTA Waduk Gajah Mungkur Wonogiri Jawa Tengah Senawi Senawi
Jurnal Ilmu Kehutanan Vol 3, No 2 (2009)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (12268.665 KB) | DOI: 10.22146/jik.1511

Abstract

Recommendation of Land Use Allocation to Control Soil Erosion in Wuryantoro Sub-Watershed DTA Gajah Mungkur Reservoir, Wonogiri, Central JavaThe research aims to recommend optimum land use allocation that can control soil surface erosion in Wuryantoro sub-watershed. The research was done using land evaluation aproach to land unit and analyzed based on area function allocation, land capability classification, and erosion hazard rate. Optimization analysis on land use allocation was done statistically through linear program symplex method using QSB software.The results showed that actual land use caused actual soil surface erosion (A) of Wuryantoro subwatershed was higher that tolerable erosion (T) treshold. Optimization analysis recommends that to control actual soil surface erosion (A) to be lower that tolerable erosion (T) treshold, its is needed to convert all actual land uses of groves and croplands to forest. Actual land uses of production forests, community forests, irrigated farmlands, rainfeed farmlands, and residential could still be kept remain as they were.
Penyusunan Skedul Suhu dan Kelembaban Awal untuk Pengeringan di Dalam Tanur Pengering Konvensional bagi Kayu Durian Bersortimen 55 X 195 mm Yustinus Suranto
Jurnal Ilmu Kehutanan Vol 3, No 2 (2009)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9176.455 KB) | DOI: 10.22146/jik.1512

Abstract

Schedule Development of Initial Temperature and Relative Humidity for Conventional Drying of Durian Wood in Dimension of 55 mm thick and 195 mm wideDecreasing supply of most commercial depterocarp wood as raw material inspirates wood working industry producing building construction component to look for uncommercial wood to be utilized. Proper utilization of these woods must be based on wood properties consisting of wood basic and processing properties. Drying property is one of the most important wood processing property. Proper drying process will be the main key to utilize effectively and ensure to get high quality wood product.Durian (Durio spp) is one of uncommercial wood grown naturally in Sulawesi island forest. This wood is used by wood industr to produce building component to be exported. There is no yet drying schedule formulation of this wood lumber in dimension of 55mm thick and 195 mm wide. The objective of this research was to develop drying schedule for durian wood in that dimension. Drying schedule was developed by the result of quick drying test. The formulation of drying schedule was elaborated based on Terazawa method.The research result showed that initial moisture content and specific gravity of this wood was 103.4% and 0.4 respectively. Theoretically, the first drying schedule was 54oC as an initial remperature and 80oC as a final temperature. Web bulb depression for the initial step of drying was 4oC and for the end step was 30oC. The range of relative himidity were 80% to 17%. These drying schedule was coded by T5F6.
A Review of Relationships Between Wood Quality and Silvicultural Practices Tomy Listyanto; John Doland Nichols
Jurnal Ilmu Kehutanan Vol 3, No 2 (2009)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (12832.543 KB) | DOI: 10.22146/jik.1513

Abstract

The effect of silviculture on wood quality has been approached from different perspectives. This relationship is being a critical concern of forest managers, landowners, and also researchers. Reliable information is needed to support forest managers in predicting the consequences of various silvicultural practices in terms of quantity and wood quality.Wood has beed used for a variety of products. Each product has particular requirements regarding quality. The variation of wood quality requirement allows industries to decide to use timber resource appropriate for their products. Silvicultural practives cover all treatments applied in forest stand management especially to improve the quality of stand, including manipulation of the availability of sunlight, nutrient and water by using several treatments such as thinning, control of spacing, fertilizing, and pruning. The quality of stand is aimed to achieve particular forest management objectives including higher wood quality.There is no broad generalization regarding the relation between silvicultural practice and wood quality. Many investigators showed positive results in relation to producing high quality of wood products, while other researchers revealed negative effects. Reliable information is needed to support forest managers in predicting the consequences of various silvicultural practices in relation to the wood quantity and quality. Continuous research is needed to find methods of producing wood of high quality based on silvicultural practices and genetic improvement which can be used in wider area by considering limitation including environment and geographic variation.

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