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Jurnalis Thaib

Pusat Penelitian dan Pengembangan Hasil Hutan

Author-ID : 2622500

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Energy Materials Science & Nanotechnology

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KEADAAN JALAN SARAD DAN POHON DITEBANG PADA TEGAKAN TINGGAL DI KAWASAN SEBUAH PERUSAHAAN HUTAN DI RIAU Jurnalis Thaib; Sona Suhartana
Jurnal Penelitian Hasil Hutan Vol 9, No 4 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1991.9.4.144-149

An investigation of skidding performance was conducted at one Forest company in Riau, in 1988. The results showed that stand density rangea from 126 to 190 trees with an average of 158 trees/ha, soft soil .without any rock, land slope ranges from 6,8 to 20,0 % and the trees felled from 2 to 8 with an average of 5 trees/ha. Also it was found that the length of productive skidding road ranges from 91,0 m to 329,8 m with an average of 210,4 m /ha while the length of unprodue- tive skidding road vanes from 2,5 m to 49,9 m with an average of 26,2 m/ha. The ratio between the lengths of unproductive and productive skidding road is 12,5 %. By considering tractor's life time 20.000 hours, around 2.500 hours of them are unproductiue, Relating this figure with owning and operating costs, those unproductive skidding road surely cause quite large loss. Besides, the unproductive tractor movements also cause land exposure to the amount of 122,5 m2/ha. All the above disadvantages can be minimized by planning akidding roads ahead and strictly controlling the operation.

TINGKAT KERUSAKAN TEGAKAN HUTAN AKIBAT OPERASI PENEBANGAN PADA DUA HAK PENGUSAHAAN HUTAN DI KALIMANTAN BARAT Jurnalis Thaib
Jurnal Penelitian Hasil Hutan Vol 6, No 2 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Minimum level of stand damages is one of the obyectives of the tropical rain forest harvesting practices in which the Indonesian Selective Cutting system is applied. In order to meet that obyective, various manuals should be prepared based on sound quantitative data.Observation on stand damages due to felling operations has been carried out in Suka Jaya Makmur Enterprise (SJM) and Kawedar Mukti Timber Enterprise (KMT), both located in West Kalimantan. The stand damages caused by felling one tree vary from 3 to 8 trees with an average of 6 trees in SJM, and from 2 to 7 trees with an average of 4 trees in KMT. The relationships between stand damage (Y) and stand density (X) are: Y = -4,69 + 0,08 X for SJM and Y = -6,83+ 0,08 X for KMT.The results of the study showed that the major causes of the variation of stand damages are improper direction of tree felling, and less control from supervisors/managers.

EFEKTIVITAS JALAN HUTAN DI SUATU PERUSAHAAN HUTAN DI RIAU Dulsalam Dulsalam; Jurnalis Thaib
Jurnal Penelitian Hasil Hutan Vol 7, No 2 (1990): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

An investigation on the effectiveness of forest roads was conducted at PT Siak Raya Timber in Riau in 1989. The objective is to find out the information on construction and uses of forest roads. The length of main and branch roads and target and actual productions during the latest six years (from1983/1984 to 198811989) were collected. The investigation results reveal that: 1.The length of forest roads built annually by PT Siak Raya Timber ranged from 16 km (consisting of 10 km main and 6 km branch roads) to 85 km (consisting of 65 km main and 20 km branch roads), with an average of 21.66 km (consisting of 11.68 km main and 20 km branch roads). 2.The annual felling area of PT Siak Raya Timber was 2,600 ha. The road densities ranged from 6.16 m/ha to 32.69 m/ha with an average of 21.66 m/ha. The road density is some what high compared to that stated in the Forest Agreement. 3.The actual production of logs at PT Siak Raya Timber ranged from 21,225.65 m3/year to 47,199.04 m3/year with an average of 34,417.03 m3/year. 4.The differencf between target and actual production averages was relatively large i.e. 75,500 m3/year compared to 34,417.03 m3/year. The effectiveness of forest roads ranged from 268.67m3/km-year to 2,305.86 m3/km-year with an average of 1,010 m3/km-year.

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