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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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Zoning Patterns of Mangrove Forests in Lampung Timur Regency Imron; Duryat; Irawan, Sandy Erggi; Tri Maryono; Rodiani
Journal of Sylva Indonesiana Vol. 7 No. 01 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i01.14202

Abstract

Mangrove forests form due to vegetative distribution along coastlines with varying growing conditions concerning substrate, freshwater intake, and oceanic currents. These disparities facilitate zoning and subsequent distinct growth patterns. The research objective was to identify the zoning structure of mangrove ecosystems in Lampung Timur Regency, Lampung Province, Indonesia. The degradation of mangrove forests in Lampung Timur Regency was thought to be caused by anthropogenic activities and inappropriate zoning patterns. Concerning data collection, the cluster sampling method was employed, which was selected based on the preliminary study's findings that the mangrove status in the study area exhibits a variety of substrates, freshwater supply, and strong ocean currents. There are five clusters on the study site, with each cluster containing sample plots measuring 10m x 10m. The sampling method employed a striped path starting from the outermost part of the mangrove ecosystem, with the number of plots in each cluster dependent on the thickness of the mangrove vegetation. A regional map and GIS applications were used for mangrove zonation mapping, and the factors influencing the zonation of mangrove ecosystems were analyzed descriptively. The research findings demonstrated that the mangrove ecosystem located in Lampung Timur comprises three distinct zones: the outer zone, the middle zone, and the terrestrial zone
Application of Analytical Hierarchy Process in Strategy of Human Resource Capacity Building at The Karya Lestari Farmers Group, Sibaganding Village, Simalungun Regency Simanjuntak, Friska Irene; Siti Latifah; Rahmawaty; Mohd Hasmadi Ismail; Seca Gandaseca; Mahawan Karuniasa
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.12376

Abstract

Social Forestry is a system of sustainable forest management implemented in state forest areas/private forests/customary forests by local communities or customary law communities as executors. This study aims to analyze the priority level of Human Resources (HR) capacity-building strategies in the Karya Lestari Farmers Group, Sibaganding Village, Girsang Sipangan Bolon District, Simalungun Regency. The research was carried out from September to November 2022 using primary and secondary data. The method used is the Analytical Hierarchy Process (AHP) using the Software Expert Choice tool. The data collection method is the Focus Group Discussion (FGD). Based on the results of the AHP, the priority of the HR capacity-building strategy is the criteria for increasing group knowledge in managing business potential to produce products that have good selling value and sell well in the market in the first place. The criteria for applying to the relevant agency to be included in group business management training activities are in second place and the criteria for establishing cooperation with related parties to help introduce group business products are in third place. Alternative aspects of institutional management are in first place, alternative aspects of area management are in second place and alternative aspects of business management are in third place
Evaluation of Macro Nutrition in Some Hybrid Clones of Eucalyptus spp. on Andisol and Inceptisol Soil in North Sumatra Sinurat, Darwin; Hanum, Hamidah; Rahmawati, Nini; prit, Kanvel; Hutagaol, Adventris
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.12500

Abstract

Eucalyptus spp. is one of the most widely planted genera for pulp and paper industrial forests (Hutan Tanaman Industri/HTI) in the world, specifically in Indonesia, due to its productivity and wood properties. The growth and productivity of eucalypts in North Sumatra depend on the type of soil and the clone used. The purpose of this study was to look at the macronutrient content in different soil types and to evaluate the macronutrient content in plant biomass with different clones to keep the nutrient conditions in the soil maintained. This research was conducted at 3 of the eucalyptus plantation sector in North Sumatera with hybrids of eucalyptus clones that were 48 months old. Height, diameter breast height (DBH), and survival data were taken. Wood, leaf, bark, and soil samples were taken for nutrient analysis in the laboratory. The results showed that there were differences in soil macronutrients (N, P, K, Mg, and Ca) among the three types of soil. The average growth also showed a significant difference in growth in each soil order. There were differences in nutrients in plant biomass for the clones tested, and there were differences in nutrients in each part of the plant biomass. Wood and bark that were taken from the tree while harvesting had a greater amount than the biomass that stays in the field (leaf and branch). The different fertilization regimes in the research area are one way to increase the productivity of eucalyptus plants in the field
Population and Habitat Management Development Strategy in The Tapanuli Orangutan (Pongo tapanuliensis) Conservation Area Perry Muhammad Athoriez, Asep; Samsuri; Purwoko, Agus; Rahmawaty; Rauf, Abdul
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.12703

Abstract

Tropical forests in Indonesia, which are mega biodiversity countries, have a rich diversity of species, including the Tapanuli orangutan (Pongo tapanuliensis). This species is found in the Batangtoru landscape, mostly in the Other Use Areas (OUA) zone, which can pose a potential threat. The importance of meaningful and long-term local stakeholder engagement. It is necessary to strengthen the management capacity among stakeholders. Therefore, a study of the strategy for developing conservation area management is required. This research aimed to analyze the development and management strategy of conservation areas by related institutions to support the Tapanuli orangutan population and habitat conservation. Despite facing various threats to orangutan conservation, stakeholders still have internal strength. The strategy that must be implemented is to use strength to take advantage of long-term opportunities through a diversification strategy
Seedling Growth Evaluation of Rehabilitated Mangrove and Carbon Estimation of Two Types of Mangroves in Perlis, Langkat, North Sumatra Ahmad Hisyam Pulungan; Basyuni, M; Rizka Amelia; Irvan; Astrid Fauzia Dewinta; Julia Syahriani Hasibuan; Itchika Sivaipram
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.13463

Abstract

Perlis Village is around the mangrove forest in Langkat Regency, North Sumatra, Indonesia. This village has several barren lands potentially planted with mangroves. They were considering that the livelihoods of most of the people were fishermen and mangrove crab catchers. It is necessary to plant and rehabilitate damaged mangrove forests to restore and repair the ecosystem in Perlis Village. Planting activities were carried out in locations considered suitable for planting 200 seedlings. Three transects were made to obtain vegetation analysis data and carbon content. Each transect consists of six plots in natural forest and restoration forest. When the seedlings at the planting location were 3 months old, observations were carried out again, and of the 135 plants, approximately 67.16 percent were still alive from a total of 200 seedlings planted. Carbon storage in natural forests is 69 Mg ha-1 and 41.64 Mg ha-1 in restoration forests. By enriching the methods and estimating the potential carbon stocks of natural and rehabilitated mangroves in Perlis village in the context of Indonesia's climate change mitigation strategy, it is hoped that this information has the potential to help the blue carbon research community and policymakers
Study Population and Characteristic Habitat of Grizzled Leaf Monkey (Presbytis comata Desmarest, 1822) in Gunung Botol Resort, Gunung Halimun Salak National Park Indri Septiani; Zainal Muttaqin; Dwi Agus Sasongko
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.14416

Abstract

The grizzled leaf monkey (Presbytis comata) is a protected endemic species of West Java based on the Regulation of the Minister of Environment and Forestry Number P.106/MENLHK/SETJEN/KUM.1/12/2018 concerning Protected Plant and Animal Species. The research was conducted in May-June 2022 in the Gunung Botol Resort, Gunung Halimun Salak National Park. This research aims to identify population numbers and characteristics of the grizzled leaf monkey’s habitat. This research was carried out by observation using the modified line transect method. There were 21 grizzled leaf monkey individuals consisting of 19 individuals from five groups and two solitary individuals. The distribution of meeting points is at an altitude between 1.119-1.292 masl. The population density in the three blocks ranges from 12.5 to 60 individuals/km². The estimated grizzled leaf monkey population at the Gunung Botol Resort is 785 individuals. The group size of grizzled leaf monkeys ranges from 2-6 individuals. The age structure of grizzled leaf monkeys showed a value of 42.86% for the adults and 28.57% for the pre-adult and adolescents. The results of measurements of temperature obtained an average of 19.90-21.60°C with an air humidity of 71.87-90.51%. The slope of the research block ranges from 25-40%, and the altitude ranges from 1.119-1.292 masl. The diversity of vegetation types in the Gunung Botol Resort was found in 98 species and 43 families. The tree-level vegetation type that has the highest Importance Value Index is the ki merak (Eura javanica) at 105.69%. There were 15 species of grizzled leaf monkey fodder trees identified from 11 families. There are 6 species of grizzled leaf monkey sleeping trees identified and come from 4 families
The Diversity of Understorey Plants In Siranggas Wildlife Reserve, Pakpak Bharat District, North Sumatra Nurul Annisa Br. Nasution; Etti Sartina Siregar
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.14695

Abstract

Information on the diversity of understorey plants in Siranggas Wildlife Sanctuary is still limited. This research was carried out to determine the diversity of understory at the Siranggas Wildlife Sanctuary Area, Pakpak Bharat Regency, North Sumatra. The study was conducted using purposive sampling method, with 5 sampling sites. Twenty plots measuring 2m x 2m were placed at each site to obtain a total 100 plots. The result showed that there were 41 species of understory plants found in the Siranggas Wildlife reserve, consisting of two division namely Pteridophytes (10 species) and Spermatophytes (31 species). The highest Important Value Index (IVI) value of understory plants in the study was obtained for Selaginella intermedia at 28,6%. The diversity index of all understory plants in the study was categorized as moderate level at value 2,88. The understory plants uniformity index was relatively high at 0,77. The species of understory plants in the study area must be preserved to maintain their sustainability.
Optimization of CO2 Laser Cutting Variables of Sengon Plywood (Paraserianthes falcataria) Using Response Surface Methodology Nugraha, Muhammad Dimaz; Iswandaru, Dian; Duryat; Hidayat, Wahyu
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.14850

Abstract

Sengon (Paraserianthes falcataria) wood is used for various purposes, including furniture, plywood, pallets, and building materials. Consumer demand for decorative wood is increasing, so innovation is needed to make it more productive and efficient. A laser cutting machine is one of the alternatives to answer this problem. Because CO2 gas wavelength and energy density offer the highest cutting quality, CO2 lasers are appropriate for wood processing. This study aims to determine the effect of laser power intensity and cutting speed on cutting plywood to get the best results. The plywood used has a thickness of 12 mm. The laser intensities used were 30 Watt, 35 Watt, 40 Watt, 45 Watt, and 50 Watt with cutting speeds of 2 mm/s, 4 mm/s, 6 mm/s, and 8 mm/s, with nozzle standoff distance set to 10 mm. In each repetition on the same sheet determine the comparison or variation of each variable used. Based on the measurement results, the highest width was obtained at 50 Watt power and 2 mm/s speed, and the lowest at 35 Watt power and 8 mm/s. The highest depth was 50 Watt and 2 mm/s, and the lowest was 30 Watts and 4 mm/s. The overall color change (∆E*) increased with increasing laser power. The higher the laser power, the more the color change increases. The change in ∆E* decreased as the laser speed increased. The optimization of cutting sengon plywood with CO2 laser using RSM method resulted in an optimum combination at 40 Watt laser power and 8 mm/s speed with a desirability value of 0.623
Mechanical Properties and Durability of Impregnated Sengon Wood Using Monoethylene Glycol and SiO2 Nanoparticles Rahayu, Istie; Riadhi, Mohamad Rizki; Wahyuningtyas, Irma; Prihatini, Esti; Ismail, Rohmat
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.15729

Abstract

Sengon wood (Falcataria moluccana Miq.) is a short-rotation wood which has weak quality characteristics, i.e., low specific gravity, strength, durability, density, and dimensional stability. This study aimed to find out the impact of monoethylene glycol (MEG) and SiO2 nanoparticle impregnation treatment on mechanical properties (MOE, MOR, and hardness) and wood durability. Four kinds of solution were used to impregnate sengon wood: untreated (water), 50% MEG, MEGSiO2 0.5%, and MEGSiO2 1%. The impregnation process was initiated by applying 0.5 atm of vacuum for 60 minutes, followed by 2.5 bar of pressure for 120 minutes. The results showed that MEG and SiO2 nanoparticle impregnation treatment significantly affected the mechanical properties (MOE, MOR, and hardness) and the durability of sengon wood against dry wood and subterranean termite bites. The optimum treatment to increase the properties of sengon wood so that its strength class increases to III-IV and durability class IV was MEG SiO2 1% treatment
Journal of Sylva Indonesiana : Vol. 7, No. 01, February 2024
Journal of Sylva Indonesiana Vol. 7 No. 01 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i01.17301

Abstract

Journal of Sylva Indonesiana Vol. 7, No. 01, February 2024

Page 10 of 12 | Total Record : 119

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