Jurnal Ilmu Kehutanan
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Model Tajuk Jati (Tectona Grandis L.f) dari Berbagai Famili pada Uji Keturunan Umur 9 Tahun
No full textCrown Model on Several Family of 9 years old of Teak (Tectona grandis L.f) Progeny TrialCrown plays an important role in regulating the rate of tree growth through the photosynthesis process. Furthermore it can be used to measure stand density and to determine the availability of growing space. Because of the difficulty and time consuming in direct crown measurement, the development of crown model is needed. The objectives of this study were to develop crown models of teak (Tectona grandis) of 9 years old from selected open pollinated families and to identifi) the variations of crown models among them.The study was conducted in an open pollinated progeny test located at the compartment 49a, RPH Sidowayah, BKPH Kedunggalar, KPH Ngawi. The experimental unit was family. Five families with the best average of stem diameter at breast height were selected as samples. Crown models were developed and variations of crown model were tested with analysis of variance.The crown model of teak can be divided into two sections. The upper crown representing the light crown section followed parabolic model while the under crown representing the shaded crown section followed linear model. No differences in crown model were found among families. The proposed models are:light crown section, paraboloid : Rl =1.91 * hl0.33shaded crown section, linear .. Rs = -0.75 + 0.57 hswhere Rl is light crown radius (m), hl is the height of light crown section (m), Rs is shaded crown radius (m) and hs is the height of shaded crown section (m)
Nilai Penting Agroforestri, Hutan Rakyat dan Lahan Pertanian dalam Konservasi Keanekaragaman Jenis Burung di Paliyan, Gunung Kidul, Yogyakarta
No full textImportant Values of Agroforestry, Community Forest, and Agricultural Land on Conservation of Bird Diversity in Paliyan, Gunungkidul, YogyakartaAgroforestry is recognized as a land use management that capable to integrate the need of local peoples and the concern of biodiversity conservation. However, some contradictory results of studies made the importance of agroforestry on conservation of biodiversity questionable. To understand the role of agroforestry in biodiversity conservation, bird community assemblages of three land use types namely private forests, agroforestry and annual crops were compared. Single belt point count with a radius of 50 m was used to survey birds. In general species diversity in the study area was at a moderate level. Statistically, bird communities between sites did not differ significantly in term of their abundance, species composition, and diversity. It was because patch context plays more important role than patch content. However, it was found that in all community parameter agroforestry area has higher values than those of crops. Consistent with the previous studies, insectivorous birds were the most sensitive to land use changes. The conservation value of Paliyan area was relatively low, because most of species were abundant, and no species inhabit endangered status according to IUCN criteria. Implication of this research was that Paliyan area need a large-compact habitat to conserve high bird diversity
Pengaruh Generalisasi Unit Lahan pada besarnya Erosi (Studi kasus di DAS Air Nelas, Propinsi Bengkulu)
No full textEffect of Land Unit Generalization on the ErosionLevel (Study Case in Air Nelas Watershed, Bengkulu Province)The research aims to identify the effect of land unit generalisasion on the erosion at the Air Nelas catchment area in Bengkulu Province. Land unit generalisation is one step to be done in arrangin RTL-RLKT (Rencana Teknik Lapangan-Rehabilitasi Lahan dan Konservasi Tanah; Field Planning for Soil Rehabilitation and Conservation) conducted by Balai Pengelola DAS (formerly Balai RLKT).Method applied by conducting digital analysis using GIS Program to calculate erosion of the catchment area with USLE (Universal Soil Loss Equation) formula. Comparison analysis was done between the result of erosion before and after land unit generalisation. Land unit generalisation is a process to eliminate land unit having area 1 cm2 on map or 25 hectares on the field at the scale of 1:50.000. The instruction to run generalisation in ArchInfo GIS program is ELIMINATE. Land unit generalisation is done to simplify map analysis manual by avoiding land unit which is very small in the area.The research result showed that for the whole Air Nelas catchment area the erosion rate was 601,279.49 ton/ha/year before generalisation and 267,907.54 ton/ha/year after generalisation, indicating that there was a 33,371.95 ton/ha/year difference or 55.44% as the effect of land unit generalisation process. When the observation was mainly at the area of rehabilitation and conservation, there were categorical changes of the erosion i.e. from Moderate to Heavy or Very Heavy and vice versa. The change was varying between 148,244.82 ton/ha/year (Moderate to Very Heavy) and 79,470.62 ton/ha/year (Very Heavy to Moderate). Overall, the erosion was increaasing aas 65,335.90 ton/ha/year (11,01%) for the whole category in area where rehabilitatin and conservation have to be conducted. Those changes would affect the plan which determine recommendations to be taken in rehabilitation and conservation of catchment areas, as well as change in the project location and budget.
Participatory Indicators of Success of Community Forestry Programs in Uganda
No full textIn Uganda, a large diversity of community initiated forest management systems have evolved recently in response to severe degradation of forests and grazing land and biomass shortages. Forestry professional, forest user group and farmers were organized in June 2004 to develop commonly agreed indicators of the performance of Community Forestry Program in Uganda. Indicators, such as access to fuel wood, incidence of forest fire and amount of community funds raised through the sale offorest products are commonly agreed at local level. Women participation in forestry related meetings and taste of drinking water in the watershed area are also important. Equitable benefit sharing by the community forest users serves as an indicator of better access to forest products. Socio-economic changes such as women participation in forest related decision-making, income generated from community forests, and equity of benefits from community forests also, reflect the program success
Studi Pembuatan Kelas Bonita pada Tegakan Acacia mangium Willd. di PT. Musi Hutan Persada, Sumatera Selatan
No full textStudy on the Determination of Site Quality Index for Acacia mangium Willd. in PT Musi Hutan Persada, South SumatraSite index is required to estimate forest productivity. This study was conducted to generate a diameter-height model and use it to construct a direct site quality index for Acacia mangium Willd. stands without thinning by dominant height approach in PT. Musi Hutan Persada,South Sumatra. It comprises two phases, namely dominant height curve development and site index construction based on semi-permanent and permanent plots data. The regression analysis of maximum diameter was employed to estimate the dominant height. The accepted diameter-height model was used for modeling an anomorphic site index using Schumacher’s formula. Dominant height could be estimated using the equation:Ln h = 3.588 - (6.955/d) , (R2 = 0.91, sum of square error = 0.24), where h : dominant tree height and d: stem diameter.The equation was then used to modeling site index of A. mangium stands with age index of 6-years. The proposed model was :
Pengaruh Bentuk dan Perbedaan Kombinasi Pengikat Kayu Lamina Balau Kuning (Shorea leavis Ridl) terhadap Tingkat MoE dan MoR
No full textEffect of Forms and Different Combinations of the Extension of Lamina of Yellow Balau Wood (Shorea leavis Ridl) on MOE and MOR LevelsThe research aimed to find out the mechanical strength of MoE and MoR of lamina woods with different forms and combinations of the extension. Balau wood (Shorea leavis Ridl) was used as an experiment object.The research experiment was assigned based on Completely Randomized Design with two treatments and three replications. The treatments were: 4 extension types as A factor, and 4 extension fastener types as B factor. With combination of 4 x 4 x 3, the samples needed in total were 48. The Lamina’s MoE (Elasticity’s Modulus) ranged from 6.866,971 kg/cm² to 17.296,556 kg/cm² and nd the MoR (Modulus of Rupture) ranged from about 40,586 kg/cm² to 118,240 kg/cm²
Penggunaan Tepung Buah Nipah (Nyfa Fruticans Wurmb) sebagai Ekstender pada Perekat Urea Formaldehid untuk Papan Partikel
No full textUtilization of Nypa Fruit Flour (Nyfa Fruticans Wurmb) as an Extender in Urea Formaldehyde Adhesive for Particle BoardNipah fruit (Nyfa Fruticans Wurmb) is a seasonal forest product abundantly produced in each season. Nipah fruit flour is believed to also function as an extender during adhesion process of wood products such as plywoods and particle boards. The study aims to determine the right composition between nipah fruit flour and industrial flour as an extender which, together with urea formaldehyde adhesive, to be applied to particle board. Results revealed that the composition of 50% industrial flour and 50% nipah fruit flour (A3 treatment) gave the highest Modulus of Elasticity (MoE) with value of 16,833.90 kg/cm2 while average value of all treatment was 12,131.41 kg/cm2. The MoE of A3 treatment fulfilled the national standard (SNI) of 15.000 kg/cm2. As for MoE, the composition of A3 (50% industrial flour and 50% nipah fruit flour) was the most efficient mixture in producing the highest MoR with 119.30 kg/cm2. The MoR value for A3 also fulfilled the national standard of 80 kg/cm2. Comparing between treatments, all other treatment gave the MoE value less than reuired by national standard. The particle boards produced by other treatments were easily bent due to high carbohydrate and water content that weaken the elasticity of boards. For MoR character, all treatments gave value as required by national standard (higher than 80 kg/cm2) except treatment A5 which gave the value of less than required (76,36 kg/cm2)
Pengaruh Gibberellin (GA4) terhadap Waktu Perkecambahan dan Pertumbuhan Tinggi Semai Cendana (Santalum Album Linn.)
No full textEffect of Gibberellins (GA4) on Germination Time and Height of Cendana (Santalum album Linn.) The hemiparasite Santalum album Linn. (cendana) grows very slow, in nature the rare and difficult seeds need stimulation to germinate. Gibberellins (including GA4) are growth regulators, usually used to increase growth as well as to break seed dormancy. The objectives of this research were to investigate the influence of gibberellins on germination percentage and height of cendana growth. Experiment was laid out in a Completely Randomized Design with 3 replicates of 300 seeds for germination percentage and 3 replicates of 10 seeds for seedling growth. Gibberellin was applied as treatment with 100, 300, and 500 ppm. The seed germination was recorded until 9 weeks, and height of plants measured until 8 months at the greenhouse. The results showed that the addition of gibberellins at all treatment increased the percentage of germination and caused the seeds germinated four weeks earlier than the control. In the first 4 months, 500 ppm gibberellins gave the highest acceleration of germination, afterward all treatments have relatively the same influences. Gibberellins gave positive effect on height of cendana growth. After 7 months, the growth decreased although all gibberellin treatments gave higher growth than the control
Perencanaan Jangka Pendek DAS dengan Metode Perhitungan Erosi Kuantitatif dengan Penginderaan Jauh dan Sistem Informasi Geografis
No full textShort-term Planning of Watershed Using Calculation of Quantitative Erosion Method Based on Remote Sensing and Geographic Information SystemPriority determination of some sub watersheds experienced difficulties based on the fact that data collection of the related sub watersheds takes time and quite costly. Whereas to comprehensively manage sub watershed, some prioritizet sub watersheds have to be chosen to manage holistically and integrally with good coordination between some related agencies. The study was carried out in India in two Nawagaon Maskara Raoi watersheds, Saharanpur city, located 250 km to the east of New Delhi. The study appointed a sub watershed to be the prioritu among the other 10 available using quantitative calculation method (MMF: Morgan, Morgan, and Finney method). The research aimed to measure the quantitative erosion based on MMF model and calculate the value index to determine the priority in sub watershed.The erosion calculation by MMF model produced five erosion levels i.e. very low (vl=0-5t/ha/yr), low (l=5-10 t/ha/yr), medium (m=10-25 t/ha/yr), high (h=25-50 t/ha/yr), and very high (vh 50 t/ha/yr). At the highest erosion level (vh) location with the most extensive land damage to the narrowest respectively was Sarbar Rao (SB) = 116.84 ha, Galr Rao (GR), Sahansra Thakur (ST), Shakumbari Rao (SH), Khawonwala Rao (KH) Kahan Rao (KR), Nawagaon Rao (NW), Chamarla Rao (CH), Track Fallows (TF), Barkala Rao (BR), and Maskara Rao (MR) = 0.34 ha. Of 11 sub watershed, priority value index was calculated, and the highest value (main priority) to the lowest one (least priority) is respectively as follows: GR (Galr Rao) = 33,5, KR (Kahan Rao), ST (Sahansra Thakur), TF (Track Fallows), BR (Barkala Rao), SB (Sarbar Rao), SH (Shakumbari Rao), CH (Chamarla Rao), KH (Kharonwala Rao), MR (Maskara Rao), and NW (Nawagaon Rao) = 18,2. Therefore the main priority fell for sub watershed Galr Rao (997.32) and the least priority for watershed Nawagaon Rao (7646.78 ha).
Dampak Kepariwisataan terhadap Erosi di Kawasan Wisata Kaliurang
Get PDFImpact of Tourism on Soil Erosion in Tourist Area of KaliurangTourism is one alternative of non timber based forest managements however, tourism activities will impact on the tourist areas, both biophysically and socially. The purpose of this research was to study the factors influencing soil erosion rate in tourist area, and to examine the effect of tourist characteristics, e.g. visiting characteristics and tourist activities on erosion rate.The erosion prediction was carried out at tourist areas including Hutan Alam (Natural Forest), Taman Bermain Anak (Play Ground), Taman Wisata Alam (Natural Tourist Park), and Kali Kuning Camping Ground. The Universal Soil Loss Equation (USLE) model was applied. Correlation analysis was used to analyze the correlation between factors influencing soil erosion rate (rainfall erosivity, soil erodibility, slopes, vegetation and conservation practices) and erosion.The research resulted that tourism significantly impacted on erosion at Play Ground, Natural Tourist Park 1, and Kali Kuning Camping Ground, except at Natural Tourist Park 2. The correlation analysis showed that all of the factors influencing soil erosion rate positively affected erosion. The results also showed that the tourist characteristics which influence erosion rate were tourists' visiting characteristics and their activities