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KEADAAN JALAN DI DAERAH HUTAN NON-JATI JAWA TENGAH DAN POTENSINYA DALAM AKSELERASI EROSI TANAH Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 11, No 1 (1993): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

An investigation on forest road conditions in non-teak forests of Kedu Utara and kedu selatan Forest Districts and their soil erosion potentials was conducted in early 1992. The samples of roads investigated were 6 segments in kedu Utara and other 6 segments in Kedu selatan in Kedu Selatan, each of 50 m long, Forest areas distribution and road inventory were also investigated and collected. It is found that forest sections in both forest districts are spread in several regencies and each section consisted of several relative small areas scattered in many locations which are seperated by villages and other land uses. This condition becomes the constraint in practicing good forest management in the area. The total area used for rood infrastructure (combined graveled forest roads and public roads) in Kedu utara and kedu selatan are 8.30 ha (0.03%) and 60.62 ha (0.14%) respectively. This means that an average land lost due to roading is only 0.08%.All factors in the universal soil loss equation (USLE) for the non- teak forest areas of kedu utara and kedu selatan are in the level of high scores in terms of soil erosion acceleration potential. It is noticed in the field that many segments of forest roads have been seriously eroded, especially along the berms and ditches, and on the fill and cut sections. Better planning and construction practices of forest roads are necessary to avoid forest land damage due to soil erosion.

KEADAAN ELEMEN JALAN HUTAN DAN POTENSINYA DALAM MEMPERCEPAT EROSI TANAH Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 6, No 3 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

A study on the forest road element conditions in relation to soil erosion potentials was carried out at two logging companies in Buntok area, Central Kalimantan in 1988. Road elements measured in the field are those related to the Universal Soil Loss Equation factors such as road openings, surfaces, slopes, ditches, culverts, cuts, fills, diversion ditches, and the incidence of vegetation.The results showed that forest road elements are in the condition of high potentials for accelerating soil erosion.Factors that caused this problem, as identified in the field, are: long and steep slopes, wide ground openings, and bare soil surfaces, in addition to the originally sensitive to erosion soil type, and hot and wet weather.Qualitatively, it is realized that soil erosion is quite serious. Therefore, further study is necessary in order to find the quantitative amount of soil erosion occured in the area.

POTENSI JALAN HUTAN DALAM AKSELERASI EROSI TANAH DI KALIMANTAN BARAT Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 5, No 3 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

A study on the potential of forest roads for accelerating soil erosion on was carried out at four logging companies in West Kalimantan in 1987. Road elements measured in the field are those related to the Universal Soil Loss Equation factors such as road openings, surfaces, slopes, and ditches, culverts, cuts, fills, diversion ditches, and the incidence of vegetation. The results showed that forest soil disturbances caused by road construction create ground condition which has high potentials for accelerating erosion. Factors that caused this problem, as identified in the field, are: log and steep slopes, wide ground openings, and bare soil surfaces, in addition to the originally sensitive to erosion soil type, and hot and wet weather.Further study is necessary in order to find the real amount of soil erosion occured in forest roads in West Kalimantan. Qualitatively it is known to be high but quantitatively it needs to be found

KEADAAN JALAN HUTAN DI HUTAN JATI DAN POTENSINYA DALAM AKSELERASI EROSI TANAH DJaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 9, No 3 (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.1991.9.3.129-136

An inuestigation on forest road conditiona in teak forests of Cepu and Randublatung Forest Districts and their soil erosion potentials was conductild in early 1991. The samples of roads inuestigated were 30 segments in Cepu and 14 segments in Randublatung each of 60 m long.It is found that from the total of 266 km truck roads in Cepu, only 3.7% of them are in 2% are active roads. for the 180 km rail roads, 65.4% are in good conditionsIn Randublatung. the total length of truck roads is 237 km of which only 11.8% are in good conditiouns but 78.3% are active roads For rail roads, the total length is only 33 km and only 13.5% of them are in good conditionsThe total area used for road infrastructures (combined truck and rail roads) in cepu and Randublatung are 266 ha (0;8%) and 163 ha (8.5%), respectively. This means that an average land lost due to roading is 0. 7%.All factors in the USLE for the teak forest areas of Cepu and Randublatung are in the level of low scores in terms of soil erosion acceleration potentials except soil erodibility. It is noticed in the field that this soil erodibility factor is couered by other dominant facton and. therefore, soil erosion potentials of forest roads roads are generally low.

PRODUKTIVITAS DAN BIAYA PENYARADAN KAYU DENGAN TRAKTOR PERTANIAN YANG DILENGKAPI ALAT BANTU Sukadaryati Sukadaryati; Dulsalam Dulsalam; Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 23, No 4 (2005): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Penelitian produktivitas dan biaya penyaradan kayu dengan traktor pertanian yang dilengkapi alat bantu dilakukan di hutan tanaman kayu mangium di KPH Bogor. Tujuannya adalah untuk mendapatkan inforrmasi teknis finansial tentang penyaradan kayu dengan traktor pertanian yang dilengkapi alat bantu. Data panjang dan diameter kayu yang disarad, waktu kerja dan biaya penyaradan dikumpulkan.Hasil penelitian penyaradan menggunakan traktor pertanian yang dilengkapi alat bantu sederhana mampu menyarad 3 batang/rit atau 2,075 m3.hm/jam. Traktor pertanian yang dilengkapi alat bantu winch menghasilkan produktivitas penyaradan yang lebih baik, yaitu sebesar 2,328 m3.hm/jam. Biaya penyaradan dengan traktor pertanian yang dilengkapi alat bantu sederhana sedikit lebih rendah dibanding biaya penyaradan dengan traktor pertanian yang dilengkapi alat bantu winch. Disarankan bahwa alat bantu taktor pertanian perlu disempurnakan. Di samping itu penyaradan pada areal dimana penyaradan secara manual tidak mungkin dapat dilakukan, traktor pertanian yang dilengkapi alat bantu dapat dijadikan salah satu alternatif.

PENINGKATAN PEMANFAATAN KAYU RASAMALA DENGAN PERBAIKAN TEKNIK PENEBANGAN DAN SIKAP TUBUH PENEBANG: STUDI KASUS DI KPH CIANJUR, PERHUTANI UNIT III JAWA BARAT Sona Suhartana; Yuniawati Yuniawati; Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 23, No 5 (2005): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Penelitian ini dilaksanakan di KPH Cianjur Jawa Barat pada tahun 2005. Tujuan penelitian adalah untuk mengetahui peningkatan pemanfaatan kayu rasamala yang dihasilkan dari penerapan teknik penebangan serendah mungkin dan konvensioal sikap tubuh penebang (jongkok dan membungkuk).Data yang dikumpulkan adalah: waktu kerja, volume kayu, produktivitas, efisiensi, tinggi tunggak dan biaya penebangan. Data dianalisis dengan Rancangan Acak Lengkap faktorial split plot.Hasil penelitian menunjukkan: (1) Dengan menerapkan teknik serendah mungkin dapat meningkatkan efisiensi sebesar 28.5% (jongkok) atau 28,2% (membungkuk); (2) Teknik penebangan dan sikap tubuh penebang berpengaruh nyata terhadap produktivitas dan biaya penebangan; (3) Rata-rata tinggi tunggak untuk teknik penebangan serendah mungkin adalah 9.18 cm (jongkok) dan 9.64 cm (membungkuk); sedangkan untuk teknik konvensional adalah 15.83 cm (jongkok) dan 16.41 cm (membungkuk).

ANALISIS PEMBANGUNAN PRASARANA ANGKUTAN DAN EKSTRAKsl KAYU SERTA DAMPAKNYA. TERHADAP LINGKUNGAN HUTAN DI PROPINSI RIAU Djaban tinambunan
Jurnal Penelitian Hasil Hutan Vol 9, No 5 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

An investigation on various aspects of timber harvesting practicues in two loggini companies in Riau has been conducud in June 1991. One of them is operating in dry land forests and the other is in swamp forests.Road construction in the first company is accomplished by the steps of selecting route Iocation, land clearing and road forming, road grading, and right of way clearing with the total cost of Rp. 3.8 million/km. Whereas, log extraction is done by the steps of felling, skidding, debarking, loading, hauling and unloading with the total cost of Rp. 8,210/cu.m.In swamp forests, rail road construction follows the steps of route survey, right of way clearing, installing rall suppors and steel rails with the cost of Rp. 8,420,000/km, including the costs of logs used for the supports amountr to 151 cu.m/km and steel rails. By using this facility and manual (kuda-kuda) skidding, it is found that the cost of log extraction is Rp. 13,250/cu.m.Logging roads have many land openings and steep, bare soils so that they are in the condition of high soil erosion potential. Whereas, for rail roads, it is noticed that their soil erosion is low because the land on both sides and under the rails is well covered by litter, logs and vegelation roots.

BEBERAPA ASPEK GEOMETRIKA JALAN HUTAN DAN HUBUNGANNYA DENGAN EROSI TANAH Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 6, No 7 (1990): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

A study on the forest road geometrics in relation to the process of soil erosion was carried out at four logging companies in Kotawaringin Timur, Central Kalimantan in 1988. Road geometric aspects measured in the field are those related to the Universal Soil Loss Equation factors such as road openings, surfaces, slopes, ditches, culverts, cuts, fills,diversion ditches, and the incidence of vegetation.The result shows that forest road geometrics are in the condition of high potentials for soil erosion. Factors that caused this problem, as identified in the field, are: long and steep slopes, wide ground openings, and bare soil surfaces, in addition to the originally sensitive to erosion soil type, an.d hot and wet weather.The concessionaires and Indonesian Government have not given proper attention to the seriousness of this soilerosion yet. Qualitatively we know that the erosion level is high but quantitatively we do not know the value yet. Therefore, further study is necessary.

UJI COBA PENGELUARAN KAYU DI HUTAN TANAMAN PULAU LAUT DENGAN SISTEM KABEL LAYANG P3HH20 YANG DISEMPURNAKAN Dulsalam Dulsalam; Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 20, No 4 (2002): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2002.20.4.313-331

log extraction in undulating forest areas needs special attention. Forest Products Research Centre has made improvement on P3HH20 skyline system designed for extracting log on undulating area. The equipment consists of three main parts such as power machine unit, wire rope and its auxillary and carriage intended to guide log movement. At the first time, the capacity of the equipment was only 0.308 m3/round trip. In 1998, the equipment was improved and then in 1999 was tried to extract logs in forest plantation of PT Inhutani II. Pulau Laut. South Kalimantan. The choice of the location was done purposively. The objective is to prove whether the impoved P3HH20 skyline system is suitable for extracting log in plantation forest area having undulating terrain. The research results showed that:1. The use of improved P3HH20 skyline cable system for log extraction in plantation forest Pulau Laut provides promising suitability with still relatively low productivity,2. log diameter extracted ranged from 17 to 43 cm with an average of 23 cm while log length extracted ranged from 8 m to 12 m with an average of 11 m.3. log volume extracted varied from 0.026 to 0.309 m3/round trip with an average of 0.160 m3/round trip.4. Effective log extraction productivities ranged from 1.404 to 2.810 m3 (hour with an average of 1.980 m3/hour while the total log extraction productivities varied from 0.485 to 1.080 m3/hour with an average of 0.885 m/hour.5. The average of log extraction cost was Rp 23.572/m3.6. To increase log extraction productivity. it is suggested that further improvement on ballast and endless cable need to be done. as well as further trial infield operations.

STUDI KASUS PRODUKTIVITAS DAN BIAYA PENGELUARAN KAYU DENGAN SISTEM KABEL LAYANG KOLLER 300 Dulsalam Dulsalam; Djaban Tinambunan
Jurnal Penelitian Hasil Hutan Vol 15, No 8 (1998): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1998.15.8.449-462

Studi produktivitas dan biaya pengeluaran kayu dengan sistem kabel layang Koller 30C telah dilakukan di satu perusahaan di Kalimantan Timur pada tahun 1994. Tujuannya adalah untuk mengetahui informasi tentang produktivitas dan biaya pengeluaran kayu dengan sistem kabel layang Koller 300. Data spesifikasi Koller 300, dimensi kayu yang dikeluarkan, konsumsi bahan bakar, waktu kerja, dan upah tenaga kerja dikumpulkan. Hasil dari studi ini adalah sebagai berikut :1.Untuk persiapan, operasi dan bongkar alat sistem kabel layang Koller 300 berturut-turut memerlukan waktu rata-rata 3,5 ; 3,89 dan 1,39 jam/jalur kabel.2.Diameter kayu yang dikeluarkan berkisar antara 15 - 52 cm dengan rata-rata 29 cm dan panjang kayu berkisar antara 4,3 - 30,7 m dengan rata-rata 8,5 m.3. Volume kayu yang dikeluarkan dari setiap jalur kabel berkisar antara 4,230 - 25,803 M3/jalur kabel dengan rata-rata 11,505 m3/jalur kabel sedang volume kayu yang dikeluarkan setiap rit berkisar antara 0,101 - 1,521 m3/rit dengan rata-rata 0, 466 m3/rit.4. Produktivitas alat per jalur kabel berkisar antara 1,04 - 2,98 m3/jam dengan rata-rata 2,19 m3/jam sedang produktivitas ekstraksi kayu berkisar antara 0,85 - 2, 19 m3/jam dengan rata-rata 1,70 m3/jam.5. Waktu kerja tidak prduktif berkisar antara 0,24 - 3,81 jam/jalur kabel dengan rata-rata 1,10 jam/jalur kabel (18% terhadap seluruh waktu kerja alat).6. Biaya ekstraksi kayu dengan Koller 300 berkisar antara Rp 22.387 - Rp 59.036/m3 dengan rata-rata Rp 33.322/m3.

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