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MANIPULASl POLA SADAP UNTUK MENINGKATKAN BASIL GETAH POHON AGATIS (AGATHIS SP.) Ishak Sumantri; Dulsalam Dulsalam
Jurnal Penelitian Hasil Hutan Vol 9, No 1 (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.1991.9.1.1-4

Thia ptJPB preaenta the re1ult1 •of invatifOtion on tapping design1 manipulation to increae relin• yield of A,aihiaap. cawied out in Wono10bo Sub Fore1t Diatrict, Purworejo Fore1t District, Unit 11 Perum Perhutani Central Java, in 1989. The objective iB to (ind out the tapping design that can increaae retin yield. For thit purpo•, the 1lanted and horizontal tappi1111 daigna were applied. Data obtained were analysed by uaing neated desilnl with 2 x 6 'x 4 (acto1'1. The retult•are as foUowa : I. An awrage reain yie1d of .Agathia ap. in Wonoaobo Sub Foreat District was 2.4 7 gram/tree/day with the ro111e between O. 71 and 8.29 gram/tree/day.2. The Average rain y1Bld1 of Alatbia 1p. uting 1lanted and horizontal tapping design1 were 2.80 and 2.66 gram/tree/day, re1Pectively.3. The average rain yield• of Agathia 1p. in February, .March, April, .May and June were 1.88, 2.62, 2.62, 2.66 and 2.69 1n1m/tree/day, rapectively. .4. The average rain yields of Agathia 1p. at the fir•t, second, third and fourth tappings were. 2.36, 2.46, 2.63 and 2.66 gram/tree/day, respectively.5. The rain yields among tapping months were different significantly while the resin yields either between tappfn6 deligna or amorw tapping (requencie1 were not Bignificantly different. Compered to relin yield of horizontal tappin6 de.Wn. the rain yield of 1lanted ta~ping deBign wa• 16% higher.

ANALISIS.KERAPATAN JALAN HUTAN BERDASARKAN HASILPENAFSIRAN FOTO UDARA DAN SURVEl LAPANGAN: STUDI KASUS PT.INHUTANI II Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (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.1991.9.2.53-58

Forest road network has a very important role in tranaporling logs fram the frest to processing site or logyard. The investigation of forest road density by using theaerial photo of l : 20.000 and 1: 60.000 scales had been conducted.The scope of the aerial photo is the second five-year working plan of PT. lnhutani 11 Pulau Laut, South kelimanten. The results are. as follows :1.Based on aerial photo interpretation, forest road density is 7,6 m/ha.2.Based on average skidding distance, and road construction and road maintenance costs, road denvities ha and 17,4 m/ha. respectively.3. Actual forest road density in PT. lnhutani II forest area is not optimum yet because it is far less than optimum values resulted from calculation based on average skidding distance and road construction and maintenance costs.

HUBUNGAN ANTARA DIAMETER POHON DAN PRODUKSI GETAH DALAM PENYADAPAN GETAH AGATHIS spp Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 9, No 6 (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.1991.9.6.229-231

This paper presents the resull an invaligation of the relationship between tree diameter and copal production in the Agathis spp tapping. Copal lappings were done using slanted and horizontal tapping patterns on the Agathis trees having diameter between 24 and 40 cm with the age of 20 years.The results of data analysis are as follows :1. At the even age Agathis trees, there was no relationship between tree diameter and copal production.2.Viewing from the coefficient of determination, the contribution of slanted tapping pallern was 12% and horizontal tapping pattern was 1%. Other factors that may affect copal production are the color of bark and leaf, crown size and the direction of resin canal.3.Better relationship between diameter and copal production may be obtained if the size of tapping quare is proportional to tree diameter/perimeter.4.Further investigation, by including other variables, is suggested in order to formulatete better relationship.

PENYADAPAN GETAH PINUS MERKUSII DENGAN MENGGUNAKAN BEBERAPA POLA SADAP DAN TINGKAT KONSENTRASI ZAT PERANGSANG Ishak Sumantri; Wesman Endom
Jurnal Penelitian Hasil Hutan Vol 6, No 3 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Three methode for tapping pine tree resin. i.e., 3 x 4 cm, 1,5 x8 cm and Indian tapping method were investigated in Cianjur Forest District in 1988. To increase the resin yield, sulphuric acid (H2S04) with 0%, 15 %, 25 %, and 35 % con- cetratation were used. Each tapping method was applied on fourty pine trees. The results are as fallows :1.Using stimulant with the three methods of tapping increase the resin yield. 2.From the. three tapping methods applied, Indian tapping method showed the highest resin yield, i.e. 12. 72 gram/tree/day.3.Indian tapping method gives Rp 5/kg profit. This value was found by subtracting selling price (Rp, 150/kg) with production cost (Rp. 145/kg).

PENGKAJIAN PARAMETER FUNGSI VOLUME POHON MELALUI FOTO UDARA DI KALIMANTAN TIMUR Ishak Sumantri; Haryono Haryono; Machfudh Machfudh
Jurnal Penelitian Hasil Hutan Vol 1, No 3 (1984): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

The relationship between tree crown diameter and/or tree height which measured from aerial photos in tropical rain forest is the object of this study. Result of model analysis by crown diameter and tree height variable are as follows :In the harvested primary forest condition, the most appropriate model for all tree samples is : Y = 30,615 -1,580 D + 1,247 T + 0,037 D2 -0,021 DT with coefficient correlation r = 0,9637.The most appropriate model by crown diameter variable in the harvested primary forest condition for all trees samples is : Y = 1,732 + 0,214 D with r = 0,2971. For Meranti species, the most appropriate model is : Y = 6,684 - 0,555 D + 0,020 D2 with r = 0,664 and for Ulin species is: Y = - 37,736 + 2,738 D - 0,036 D2 with r = 0, 776. 3. The model and its analysis are valid for East Kalimantan only.

PERUBAHAN PENGGUNAAN LAHAN HUTAN SEKITAR SUNGAI KAMPAR, RIAU Ishak Sumantri; Machfudh Wesman E; Haryono Haryono
Jurnal Penelitian Hasil Hutan Vol 4, No 3 (1987): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

This study is to evaluate the trend of forest land-use change as a result of the community's activities in pursuing its need for settlement and land cultivation in forest land in the vicinity of Kampar river, Riau. To understand the trend of forest land utilization change, 4 data resource references including aerial photo 1964, general view of 1974 forest map, 1982 land use map, and a ground check in 1984, have been used. During two periods i.e., in the years from 1964 to 1974, and from 1974 to 1984, it is known that an invation occured into both limited production forest and conversion forest in the Sub Districts of Kampar Kiri and Sengingi. An analysis of data, using "population pressure" and "location-quotient formulation" technique shows that population pressure and low income causes invation into the forest areas

PENGGUNAAN FOTO UDARA DALAM PENILAIAN KERUSAKAN TAJUK AKIBAT EKSPLOITASI HUTAN Ishak Sumantri; Wesman Endom
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

An investigation of the impact of logging operations on crown damage by using the aerial photograph of forest areas of PT. INHUTANI II in Pulau Laut, South Kalimantan was carried out.The results of the investigation lead to the following conclusions:1. Panchromatic black and white aerial photograph of 1:20.000 scale is good enough to use for evaluating the damage of dominant and codominant crowns and crown closure of the trees. It is found that the crown of 11 trees/ha were damaged, consisted of 9 tree crowns were damaged partially and 2 tree crowns were damaged totally.2. Steeper terrains caused larger decrease of crown closure of the trees. On the slope of 0-15%, 25-45% and 45% and above, the crown closure reductions were 61%, 76% and 80%, respectively

PENINGKATAN PRODUKTIVITAS DAN EFISIENSI PENEBANGAN KAYU MANGIUM DI SATU PERUSAHAAN HUTAN TANAMAN DI PROPINSI JAMBI Sona Suhartana; Marolop Sinaga; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 22, No 3 (2004): 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.2004.22.3.175-182

Implementation of felling technique in the timber estate is not yet practiced efficiently and appropriately. Study on the lowest possible felling technique (LPFT) is considered important to increase fellingproductivity and felling efficiency. This study was carried out at a timber estate in iambi in 2003. The aim of this study was to determine the effectof LPFT on fellingproductivity and efficiency.Data collected in this regard were: working time, wood volume, productivity, efficiency, stump height and felling cost. Two-categories data were analyzed with respect to their possible differences using a t-test.Results revealed that implementation of LPFT brought out more convenient impacts in comparison to the conventional felling technique (CFT), as follows: (1) Felling productivity increased at 3.177 m3/hr; (2) felling efficiency increased approximately 7.4%; (3) felling cost decreased by some Rp 159.1; and (4) the average stump height were 21.14 cm for LPFT and 32.83 cmforCFT

PENINGKATAN PRODUKSI LAK MELALUI PERBAIKAN SISTEM PEMUNGUTAN Ishak Sumantri; Arifin Suzanto; Haryono Haryono
Jurnal Penelitian Hasil Hutan Vol 6, No 6 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

An investigation on lac cultivation was carried out in Probolinggo Forest District in September 1988. The purpose is to find possible ways of increasing the production. Host trees and methods for lac cultivation were observed. The results reveal that: Kesambi trees are good as the host for lac cultivation because they have sap density of 0.16 and sap reaction of 0.59 which which condition is favorable for lac survivals.Higher lac production can be obtained by using host trees that have many branches and twigs. Therefore, host trees need to be pruned in order to provide many new branches and twigs.Lacquor secretion yield can be harvested 5 months after lac cultivation. The lacquor production, thew is sorted intolacquor for cultivation and industrial materials. The cultivated lac can produce lacquor to the amount of three to five fold, depending on the quality of lac cu1tivated and the existance of diseases.

KAJJAN PEMANENAN TERHADAP KERAPATAN TEGAKAN DI BAGIAN HUTAN ALAM TROPIS PROPINSI LAMPUNG Wesman Endom; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 9, No 6 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

This paper studied the logging impact on forest density in a forest concession in Province of Lampung, 38 sample plots were taken consisting of 22 plots located in virgin/not yet logged and 16 located in logged over area. The result show that :1.The initial potential of forest area can be classified as moderate, with composition of commercial wood of Dipterocarpaceae 43.9%, 14.4% Non Dipterocarpaceae and the rest 41.3% of non commercial species. The average volume of commercial wood per hectare of diameter class 50 cm and up ranged from 6 - 42 m3, and for diameter class 20 - 50 cm ranged from 7 - 48 m3 per hektar. The forest density of those two diameter classes varied from 4 - 16 trees and 16 - 64 trees per hektar, respectively.2.Forest logging operation has reduced the volume and number of commercial trees per hectare (Dipterocarpaceae and Non Dipterocarpaceae) at about 50% and 38% respectively.Compared to TPTI (Indonesian Selective Cutting System) it was found that this condition can not meet the TPTI requirements for nucleus trees for the next cutting cycle.3.The logging operation has caused the openings of land cover at about 30.54% per ha or similar to an area 3054 m2 per ha

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