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Moehar Harahap
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Journal of Sylva Indonesiana
Published by Universitas Sumatera Utara
ISSN : 26225093     EISSN : 26225158     DOI : 10.32734
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences
Journal of Sylva Indonesiana (JSI) is an international peer-reviewed biannual journal (February and August) published by TALENTA Publisher, Universitas Sumatera Utara and managed by Faculty of Forestry, Universitas Sumatera Utara. It is dedicated to interchange for the articles of high-quality research in the field of forestry and natural resources including Forest Management, Social And Economic of Forestry, Forestry Policy, Sylviculture, Forest Ecology, Plantation Forestry, Biotechnology, Forest Conservation, Biodiversity And Natural Resources, Wood Sciences And Technology, Biocomposite, and Non Timber Forest Product. The journal publishes state-of-art scientific articles in fundamental theory, experiments and simulation, as well as applications, with a systematic proposed method, sufficient review on previous works, expanded discussion and concise conclusion. As our commitment to the advancement of science and technology, the Journal of Sylva Indonesiana (JSI) follows the open access policy that allows the published articles freely available online without any subscription.
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Articles 119 Documents
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Structure, Composition, and Diversity of Dry Tropical Forest Types in the Sisimeni Sanam Forest Area, Kupang Regency, East Nusa Tenggara Province Dako, Fransiskus Xaverius Dako; Flora Evalina Ina Kleruk; Kristianto Wibison So; Blasius Paga; Yudhistira A.N.R Ora
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.17618

Abstract

Sisimeni Sanam Forest Area is a tropical dry forest area on Timor Island that plays an important role in life, such as maintaining and preserving soil fertility, being the lungs of the world, being a place for living things to live, being a source of biodiversity, regulating water management, and preventing the dangers of flooding and erosion. Data and information regarding the ecology of vegetation in this forest are still limited. This study aims to determine the structure, composition, and diversity of vegetation types in the Sisimeni Sanam Forest Area. The method used is a systematic sampling method using a double rectangular plot with a plot size of 20 x 20 m (trees), 10 x 10 m (poles), 5 x 5 m (sapling), and 2 x 2 m (seedlings and understorey). The results of the study showed that the types of vegetation found were 49 species grouped into 25 families. Cromolaena odorata has the highest relative density and frequency values at the seedling and understorey levels, while Tectona grandis (teak) dominates at the sapling, pole, and tree levels. The important value index at each growth level is in the high category with a value range of 200% - 300%. The value of the Species Diversity Index (H') in the Sisimeni Sanam Forest Area shows a number <1, meaning it is included in the low category. Forests with low species diversity values indicate that the forest area has experienced disturbance or forest damage caused by both nature and humans
Optimizing Growth of Parkia speciosa Hassk Seedlings: The Synergistic Impact of Chicken Manure Briquette Dosage and Watering Intervals for Supporting Agroforestry Practices Sri Hartini, Kansih; Dalimunthe, Afifuddin; Aini, Syarifah; Insani, Aqilah
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.17763

Abstract

Petai (Parkia speciosa Hassk) is a multi-purpose tree species (MPTS) that offers a sustainable solution for perennial cultivation in the Besitang District, within the Gunung Leuser National Park (GLNP) area, particularly in regions currently dominated by oil palm plantations. This study aims to obtain the dose of chicken manure briquettes and watering interval that produce the best growth of Petai seedlings. This study used a Factorial Completely Randomised Design (F-CRD) with observation parameters of height, diameter, number of leaves, shoot fresh weight, root fresh weight and shoot and root dry weight. The results showed that the interaction of manure briquette dose treatment and watering interval showed significant results on height, diameter, number of leaves, shoot fresh weight, shoot dry weight, and root dry weight but no significant effect found on the root fresh weight of Petai plants. The treatment 1 kg briquettes and watering every three days gave the best results in the parameters of height (15.57 cm), diameter increase (0.34 cm), number of leaves (103 strands), shoot fresh weight (39.96 grams), shoot dry weight (33.24 grams) and root dry weight (21.98 grams). Therefore, it is recommended to apply organic chicken manure briquette fertilizer at a dose of 1kg and watering frequency of once every three days for the preparation of Petai seedlings to planting in Besitang District
Diameter-Height relationship model for Shorea assamica in secondary tropical rainforest, South Borneo Wirabuana, Pandu; Yusanto Nugroho; Budi Mulyana
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.18749

Abstract

Diameter-height relationship model is generally developed to facilitate the quantification of tree height at the individual level. However, the model’s reliability principally varies due to the influence of certain factors like site quality and type of species. Thus, a site species-specific model is recommended to support sustainable forest management. This study aims to evaluate the best-fit model for estimating the tree height of Shorea assamica in the secondary tropical rainforest, South Borneo. Data from forest inventory consisting of 1,440 tree diameter at breast height (DBH) and height measurements were used to evaluate five alternative models, i.e., Linear, Power, Exponential, Sigmoid, and Gompertz. These data were randomly split into two datasets, i.e., initial model development (1,009 trees) and model validation (431 trees). The model reliability was assessed and ranked using the coefficient of determination (R2), residual standard error (RSE), akaike information criterion (AIC), mean absolute error (MAE), and root means square error (RMSE). The results of the study obtained an average tree diameter of 42.8 cm with the inverval of 22-99 cm and a mean tree height of 16.6 m with the distribution of 11-31 m. The Power model showed the best fit to explain the relationship model between the diameter and height of the S. assamica with an R2 of 74% and an RMSE of 1.72 m. It indicated Power model could facilitate more efficient tree height estimation of S. assamica in the study site
Grouping of Performance Effectiveness Assessment of Forest Management Units in North Sumatra Province Siregar, Tumpak; OK Hasnanda Syahputra; Siti Latifah
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.18769

Abstract

Forest Management Units (FMU) are established to realize the effective and sustainable management of forests and other management plans, including organization, implementation management, as well as control and supervision. The management of forests by FMU is closely tied to the role of existing human resources, both qualitatively and quantitatively, as well as the rate of deforestation. To understand the extent of FMU's performance success, an instrument in the form of a Performance Assessment is needed as an evaluation tool for achieving forest management, one of which is by using the questionnaire based on the Technical Guidelines for Assessing Effective Forest Management Institutions in Supporting Independent Communities and Sustainable Forests from the Director of Forest Utilization Planning Development. The performance assessment variables are then processed using cluster analysis to obtain groupings of FMUs in North Sumatra Province based on clusters and the average effectiveness value of FMUs. The research results show that there are 3 Clusters with details for Cluster I consisting of 7 (seven) Units, Cluster II consisting of 11 (eleven) Units, and Cluster III consisting of 15 (fifteen) Units. The characteristics obtained in Cluster 1 indicate that all variables are above the population average, which represents Effective FMUs
The Utilization Rubber Wood Finger Joint Laminated for Furniture Application Nurhanifah; Wijayanto, Arip; Anggiriani, Siska; Muhamad, Soleh; Mulyosari, Desy
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.18821

Abstract

Rubber wood (Hevea brasiliensis) was considered a promising alternative material in furniture manufacturing due to its favorable physical and mechanical properties, sufficient availability, and relatively high economic value. However, it lacked natural durability and was vulnerable to insect and fungal attacks, requiring preservative treatment before use. This study aimed to evaluate the performance of Finger Joint Laminated (FJL) products made from preservative-treated rubber wood as a potential raw material for furniture. The research involved wood selection, preservative treatment using deltamethrin and boric acid via the vacuum-pressure method, fabrication of FJL using three adhesive compositions (PVAc, PVAc + 5% hardener, and PVAc + 15% hardener), and testing of physical (moisture content and density) and mechanical (modulus of elasticity and modulus of rupture) properties according to BS 373:1957 standards. The results showed that all FJL variants met the density requirements stated in SNI 01-0608-2017. The FJL bonded with 15% PVAc and hardener achieved the highest density and exhibited superior mechanical strength. Although the addition of hardener increased the moisture content, it remained within the acceptable limit (<15%) as defined in SNI 01-0608-1989. The improvement in mechanical performance was attributed to enhanced cross-linking in the adhesive. Some mechanical failures were likely caused by uneven adhesive application. In conclusion, rubber wood treated with preservatives and processed into FJL with optimal adhesive composition demonstrated strong potential as material for furniture production
Exploring the Potentiality of Producing Sustainable Gum Arabic: Case of Sheikan Locality, North Kordofan State, Sudan Zeinab Mohamed Hammad; Hassan Elnour Adam; Ibrahim Elnour Ibrahim; Salih Omer Tutu; Hatim Mohamed Ahmed Elamin; Faisal Ismail Musa
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.19115

Abstract

Gum Arabic is a critical source of livelihood in rural areas of Sudan and a key economic commodity. This study investigates the potential for sustainable gum Arabic production in Sheikan locality, North Kordofan, Sudan. Using participatory Rural Appraisal (PRA), structured questionnaires with 302 households, and focus group discussions, the research assesses household participation, gum resource potential, and production challenges. Results indicate that 93% of the respondents own gum gardens with gum contributes 38% to household income. Additionally, from targeted respondents 37% of the respondents have less than 10 years experiences in gum Arabic activities. Based on respondents’ perception the average gum production of tree/season was (2.79 kg). However, limited participation by youth, inadequate infrastructure, and environmental constrains hinder gum production sustainability. The study recommends that integrating indigenous knowledge with modern practices, expanding youth involvement, and enhancing policy support to secure a sustainable supply of gum Arabic
Biomechanical Properties of Pinang Jawa (Pinanga javana): Structural Performance and Ecological Significance zulkarnaen, rizmoon; Adik Bahanawa; Hendra Helmant; Deanova Frestiana Br. Pelawi; Nabela Fikriyy
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.19915

Abstract

The mechanical strength of Pinang Jawa (Pinanga javana), an endemic palm species in Java, is essential for understanding its structural resilience and ecological role. This study characterizes its biomechanical properties by evaluating the modulus of rupture (MOR) and the modulus of elasticity (MOE) using standardized three-point bending tests. Samples were collected sustainably from mature palms on Mount Slamet, ensuring minimal ecological disruption. Results indicate that the MOR ranged from 7.78 to 14.47 MPa, with a mean of 11.24 MPa (±2.19 MPa), and MOE values spanned from 440.82 to 792.95 MPa, averaging 572.17 MPa (±89.48 MPa). Statistical analysis, including 95% confidence intervals of [9.77, 12.71] MPa for MOR and [512.06, 632.28] MPa for MOE, confirmed the reliability of these estimates. A one-way ANOVA revealed significant variability in MOE (p < 0.05), attributed to the anisotropic nature and heterogeneous fiber orientation, while MOR showed less pronounced variability (p > 0.05), suggesting consistent rupture resistance. These findings highlight the stem’s moderate mechanical properties compared to other palms and provide insights into its structural adaptations. This study enhances the understanding of Pinang Jawa’s biomechanical behavior, reinforcing its ecological significance as an endemic species and supporting further research on palm biomechanics and conservation strategies
Efficiency of Timber Skidding Operation in Pasoh Forest Jelebu, Peninsular Malaysia Gandaseca, Seca; Lantobong, Jusma Wati; Mohd Hasmadi Ismail; Rahmawaty
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.20024

Abstract

Timber skidding is one of the most important elements of forest harvesting. The forest harvesting process includes all operations from tree cutting and logging to a mill, rail depot, or ship dock. Efficiency is the ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. For skidding operation, widely using crawler tractors as a medium in transporting logs to the temporary log yard requires attention from many sides. This is because it may affect productivity and the time consumed to do the work. The objective of this study was to analyze the relationship between distance, time, and productivity of skidding operation by crawler tractor and take place at Compartment 65 and 66 Pasoh Forest Reserve, Jelebu, Peninsular Malaysia. Thus, in this study, the distribution of work elements on time consumption shows that skidding seems to consume more time compared to other processes, since crawler tractor workers manually do the work. As a result, the average volume per trip, productivity, and time for skidding using a crawler tractor at the initial skidding area close to the landing are 27.74 m3, 54.65 m3, and 13.5 minutes, respectively. The total distance travelled by the crawler tractor to handle the load also influenced the efficiency of time and consequently affected the rate of productivity. The harvesting operation in Pasoh Forest Jelebu, Negeri Sembilan, Peninsular Malaysia is still well managed to produce timber products, and the skidding operation in this site is efficient and productive. As the suggestion, more study need to be conducted in vary in term of distances, times, and volumes, and in various conditions representing the timber skidding operation in this area.
Estimation of Potential Carbon Economic Value of Bamboo In Community Forest Area in Rumpin-Dalam Hamlet, Rumpin Village, Bogor District Wijayani, Inggit Putri; Sasongko, Dwi Agus; Rusli, Abdul Rahman
Journal of Sylva Indonesiana Vol. 8 No. 2 (2025): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v8i2.20193

Abstract

Community forests represented one area that could be utilized in carbon trading. Rumpin-Dalam Hamlet had an area in the form of a community forest with a bamboo forest formation. The planned construction of the Serpong-Bogor toll road could result in the loss of part of the bamboo forest. This study aimed to determine the potential of bamboo, biomass, absorption, and economic value of carbon in the bamboo forest. The research procedure began with the determination and placement of plots in the bamboo forest. Biomass data collection occurred in a non-destructive manner (without causing damage). The next step was to calculate biomass, carbon stock, carbon sequestration, and the carbon economic value. The research results showed that there were five types of bamboo in the Rumpin-Dalam Hamlet Community Forest. These types included apus bamboo (Gigantochloa apus), mayan bamboo (Gigantochloa robusta), black bamboo (Gigantochloa atroviolacea), ater bamboo (Gigantochloa atter), and betung bamboo (Dendrocalamus asper). Bamboo forests in the area absorbed a carbon potential of 403.55 tCO2 and had a carbon economic value of US$ 20,177.5.

Page 12 of 12 | Total Record : 119

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