Jurnal Penelitian Hasil Hutan

94-99

Authors: Krisdianto

.Acetylation is an esterification process that aiming to replace f?ydro:>ryl groups 1vith acety/ groups in the uood.The existence of acety/ group is expected to redtae water adsorption and stabilize wood dimension consequent/y.This stutjy examined water adsorption on the tuo acetylated tropical uood species i.e.Antbocepbalus cbinensis and Calopf?yllum sp.Using isotherm method The results show that water adsorption in uood of Anthocepha/us is effective/y reduced even at the smallest 1veight percentage gain, while in Calophyll11m sp.it is effective/y reduced at 10% weight percentage gain.The tuateradsorption varies by the relative humidity and itforms sigmoid mode/from the loiuest (11 %) to the highest (97%) of humidity.

114-123

Authors: Sihati Suprapti, Erdy Santoso, Djarwanto & Maman Turjaman

Sterilized and unsterilized manginm bark which added with activators and compostedfor 30 dqys were used as a grollllh medium far mycorrhiZfllfimgi and Acacia mangium seedlings. Degradation rate of the bark 111as eoaluated based on the changing content of organiccarbon, total nitrogen,nutrient con/mt, and its cation exchange capacity (CbC).&suits sboued that activators added on the compostingproassof mangium bark reduced Cf N ratio to 21.90 in sterilized bark and 25.30 in the unsterilized, respective/y. The addition of activators tended to increase the nutrient content i.e.N 0.82-1.09%, P 0.22-0.36%,and K 0.36-1.12%,and increase the value of CEC into 31.3 to 32.7 me/100g. Mycon-hiZfllcolonization on medium means that composted mangimn bark can be used both as growth and 11rycorrhizal carriermedia. A highpercentageof vrycorrhizalcolony wasfound in the medium made of sterilized mangium bark added withactivators inoadatedwith Glomus sp.i.e.4 5%. Thegrowth rateof A. mangi um seedling on the medium made (o)stmlized mangium bark added 111ith activator tended to be higher than that of the unsterilized bark. The highest gro1vth iuasfound on mediem inoculated111ith Gigaspora sp., 1vhilethe largeststem diameter occurred on the medium inoculated 1vith Glomus sp.

135-143

Authors: M.Siarudin & Ary Widiyanto

Stutfy on pf?ysical properties of manglid (Manglieta glauca Bl.) tuood on axial and radial orientation has been conducted. Three manglid trees tuere taken as samplesfrom community forest in S odonghilir Village, S odonghilir Sub• district, TasikmalqyaRegenry, WestJava. The observation focused onpf?ysicalproperties on threepositions of both axial orientation (bottom, midle and top of trunk) and radial orientation (nearpith, middle and near bark). The parameters observed werefresh moisturecontent, air dry moisture content, and wood dimensional changes. Result sbotus that the average offresh moisture content of manglid wood is 168.77%, air dry moisture content is 14.63%, specific gravity on fresh volume is 0.35, specific gravity on air dry volume is 0.36 and specific gravity kiln dry volume is 0.38. Based on its dimensional changes, manglid wood has longitudinal shrinkage value of 1.51%, radial shrinkage value of 4.08%, tangential shrinkage value of 5.84%, and ratio of tangential and radial shrinkage of 1.54. Pf?ysical properties of manglid tuood on axial and radial orientation are variedfor freshmiosture content and specificgravity, 1vhile the air dry moisture content and the dimensional changes are not significant!J different. The trend offresh moisture content value on axial orientationis increasedfrom the bottom to the middle of the trunk, and then decreased ot the top of the trunk.On radial orientation, thefresh moisture content value consistent!Jdecreasesfrom thepith to towards the bark. Specific grqftty value on the axial orientation decreasesfrom the bottom of the trunk to the midle, then increases on the top.In radial orientation, the specificgravity value consistent!J increasesfrom thepith towards the bark.

151-160

Authors: Soenarno,Dulsalarn & Wesrnan Endorn

In timber harvesting, exploitation factor is implemented as the one parameters to determine the allocated annual production at the natural production forest. Currently, the value of exploitation factor as stipulated by the Ministry of Forestry that applies to all conditions of natural production forest exhibits large varying-topographies and in operation tends to be heavier than tose at either the fixed productionforest or convertible production forest. This situation brought about a significant difference in the exploitation factors (EF) during the timber harvesting. In average the value of EF at the Licensed Natural Forest Concessionary PT Kemakmuran Berkah Timber reached 0.92, while the EF at flat topograply (0-8') was 0.9 3; at moderately sloping (9-15'), rather steep (16-25'), and steep topographies (2640') were all similar, i.e. 0.92.