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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 147 Documents
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Quantification of Soil Organic Carbon Stocks in the Mangrove Forest of Telaga Tujuh Island, Langsa, Aceh Ashabul Anhar; Lola Adres Yanti; Ilham Hidayat; Ali Makmur; Arif Habibal Umam; Ilham Hanafi; Ariz Umar Ramadhan
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.23483

Abstract

Mangrove ecosystems are considered highly effective carbon sinks because of their substantial capacity to caputure and store carbon, especially in the form of soil organic carbon. This study aims to quantify the soil organic carbon stock in the mangrove forest of Telaga Tujuh Island, Langsa, using purposive sampling with eight circular plots of 400 m² each. Results showed that the diameter class distribution was dominated by the 10-20cm with 158 individuals. The tree density in this place was 796.88 ind. ha-1. The highest soil organic carbon stock was recorded in Plot 8, with a value of 811.24 Mg C ha-1. The mean of soil organic carbon stock was 635.28 ± 110.46 Mg C ha-1. Overall, the total soil organic carbon stock of Telaga Tujuh Island was estimated at 22,234.86 ± 3,866.20 Mg C ha-1. These results highlight the significant role of Telaga Tujuh mangroves as a carbon sink and their contribution to national carbon emission mitigation strategies.
Physical and Mechanical Properties of Finger-jointed Keruing and Meranti Board using Phenol-Resorcinol-Formaldehyde and Polyurethane-Reactive Adhesives as Truck Deck Afrian Sayyidina Achmad; Dede Hermawan; Mahdi Mubarok; Jajang Sutiawan; Ryan Nata Wirasasmita
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.24170

Abstract

Finger-jointed (FJ) boards are widely used for truck decking applications that require high mechanical strength and dimensional stability. Keruing (Dipterocarpus spp.) and Meranti (Shorea spp.) are common tropical woods, yet comparative performance data using different adhesives remain limited. This study evaluated the physical and mechanical properties of Keruing and Meranti FJ boards bonded with phenol-resorcinol-formaldehyde (PRF) and polyurethane-reactive (PUR) adhesives. Boards were manufactured using a 2 cm finger profile, adhesive spread of 260–300 g/m², and pressing pressure of 50 kg/cm². Physical properties assessed included moisture content, density, water absorption, thickness swelling, and delamination, while mechanical properties comprised modulus of rupture (MOR), modulus of elasticity (MOE), and Janka hardness. The experiment followed a factorial completely randomized design with two factors: wood species and adhesive type. All specimens achieved moisture contents of 9–10%. Keruing exhibited higher density (0.88–0.99 g/cm³) than Meranti (0.67 g/cm³). PUR adhesive significantly enhanced mechanical performance, increasing MOR to 128.81 N/mm² in Keruing and 122.70 N/mm² in Meranti, corresponding to improvements of 29.1% and 47.9%, respectively, and increasing MOE to 101.98 N/mm² and 96.88 N/mm², representing gains of 51.1% and 74.0%. These values exceeded the minimum requirements of ASTM D5572:1999. In contrast, PRF adhesive improved dimensional stability, reducing thickness swelling to 2.82% in Keruing and 3.57% in Meranti and producing low delamination values of 0.88% and 0.25%, fully complying with JAS 1152:2007 (<5%). The adhesive type and wood species had no significant effect on hardness. The results indicate that PRF is more suitable for applications requiring durability and moisture resistance, whereas PUR is preferable for maximizing mechanical strength in truck deck materials.
Physical and Mechanical Characteristics of Coconut Coir-Based Composite Roof Tiles with Molasses Polyurethane Coating Riskatul Walidaini; Dede Hermawan; Irsan Alipraja; Mahdi Mubarok; Rudi Hartono; Aprilia Kartikawati; Sukma Surya Kusumah; Jajang Sutiawan
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.24871

Abstract

Lightweight roofing materials based on natural fibers are one alternative for developing more efficient and sustainable building materials. Coconut coir is an abundant agricultural waste product with potential as a raw material for composite roof tiles. This study aims to evaluate the effect of molasses concentration variation on the physical and mechanical properties of coconut coir-based composite roof tiles coated with polyurethane. Composite roof tiles are produced from coconut coir particles and coated using a polyurethane system with varying molasses concentrations. Physical property testing included density, moisture content, water absorption, and thickness swelling, while mechanical properties were evaluated through flexural testing. All tests were conducted in accordance with JIS A 5908:2003 standards and analyzed using analysis of variance. The results showed that variations in molasses concentration in the polyurethane coating system did not have a statistically significant effect on the physical and mechanical properties of composite tiles. Polyurethane-molasses coating tended to reduce water absorption and thickness swelling compared to uncoated tiles, but did not show a consistent pattern of change. The mechanical properties of composite tiles were relatively similar across all treatments, indicating that tile performance is more influenced by the material's internal characteristics and the compaction process.
Fisher-Assisted Records of Silvery Langurs (Trachypithecus cristatus) in an Urban Mangrove Fragment, Medan Labuhan, North Sumatra Astina Desi; Erni Jumilawaty; Stanislav Lhota
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.24997

Abstract

Primate populations inhabiting human-modified landscapes continue to face threats to their persistence and long-term viability. Local studies have therefore been conducted across different regions to document the effects of habitat modification on these populations. Small mangrove patches within industrial coastal areas are seldom included in primate surveys. We examined the occurrence of the silvery langurs (Trachypithecus cristatus) in an isolated mangrove patch near the Belawan International Container Terminal, Medan Labuhan, North Sumatra. Three boat surveys were completed in August 2024 with assistance from local fishers. Direct observations were recorded during each trip, and semi-structured conversations documented local ecological knowledge (LEK). Nine sightings were made, with group sizes from one to fourteen individuals; infants were present in two sightings. When approached by boat, the animals generally moved away from the channel and into denser vegetation. The fishers' descriptions of conspicuous morphological features and commonly eaten plants broadly agreed with published accounts, whereas their views of population change differed. Because individuals were not identified and the fieldwork comprised only three targeted surveys, the records establish occurrence during the survey month but do not confirm residency, abundance, or population trend. The observations provide a starting point for longer standardized surveys of silvery langurs and their mangrove habitat in Medan Labuhan.
Land Cover and Land Surface Temperature Dynamics in West Kotawaringin (2005-2025) Based on Remote Sensing and Random Forest Classification Nazla Paradisa; Beni Iskandar; Sari Marlina; Ahmad Jauhari
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.25534

Abstract

Land cover changes can influence surface temperatures and environmental conditions; therefore, spatial and temporal monitoring is crucial for regional management and climate-change mitigation. This study analyzes land-cover and Land Surface Temperature (LST) dynamics in West Kotawaringin Regency in 2005, 2015, and 2025 using Google Earth Engine, Landsat 7, Landsat 8, and Landsat 9 imagery, Random Forest classification, accuracy assessment, and LST extraction. Forest area decreased by 228,930 ha, from 598,649 ha (63.37%) in 2005 to 369,719 ha (39.14%) in 2025, while agricultural land increased by 172,131 ha, from 207,659 ha (21.98%) to 379,790 ha (40.20%). The classification yielded an Overall Accuracy of 0.93 and Kappa coefficients of 0.89-0.90. Mean LST increased from 19.50°C to 22.31°C in forest areas and from 24.58°C to 26.20°C in settlements. The spatial pattern consistently shows lower mean LST in forested areas than in built-up and other non-forest surfaces. Scientifically, the study integrates multi-temporal land-cover and LST analysis at the regency scale to support spatial planning, environmental management, and climate-change mitigation.
Influence of The Composition Oyster Mushroom Baglog Compos on The Growth of Cajuput (Melaleuca cajuputi) Yakub Benu; Luisa Moi Manek; Ni Kade Ayu Dewi Aryani; Melkianus Pobas; Yofris Puay; Fredrik Soleman Aramak; Mahardika Putra Purba
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.25540

Abstract

Cajuput (Melaleuca cajuputi) is an important essential oil-producing tree species. This species can thrive on infertile and degraded land. However, appropriate growing media are essential for successful cajuput seedling establishment. The material that can be used as growing media is oyster mushroom baglog compost. However, there is no information on the right composition of oyster mushroom baglog compost as growing medium. This study aimed to determine the effect and the right composition of oyster mushroom baglog compost on cajuput seedling growth. The study was conducted from March to April 2025 at the Permanent Nursery of the Forestry Department of Politani Kupang. The study used a completely randomised design. The study was growing medium consisting of soil composition (S), sand (S), oyster mushroom baglog compost (C). SS (1:1), SSC1 (1:1:1), SSC2 (1:1:2), SSC3 (1:1:3) and SSC4 (1:1:4). The study was repeated three times. The results showed that although no statistically significant differences were observed among the treatments (p > 0.05), the SSC2 treatment consistently produced the highest mean values for plant height, stem diameter, leaves number, and root length.
Physiological Response of Sumatran Elephant (Elephas Maximus Sumatranus) to Land Cover Changes at TWA Holiday Resort, North Sumatra Ulil Amri Daulay; Bilqis Nur Mustofa; Agus Purwoko; Farhan Reza Pahlevi; Ratna Sari; Ridwan
Journal of Sylva Indonesiana Vol. 9 No. 02 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i02.25779

Abstract

Land cover changes due to anthropogenic activities are one of the main threats to the sustainability of the Sumatran Elephant (Elephas maximus sumatranus) habitat. This study aims to analyze the relationship between the physiological conditions of Sumatran Elephants and land cover changes in the North Sumatra Holiday Resort Nature Tourism Park (Indonesian term: Taman Wisata Alam/TWA). The study was conducted on three individual elephants, namely Nurhalimah, Sudarwanto, and Merry. The physiological data observed included age, body temperature, body condition, appetite, fecal condition, rest duration, and stress levels. Land cover data were obtained through the interpretation of satellite imagery and secondary data from the area. Data analysis was carried out using multiple linear regression, beginning with classical assumption tests and hypothesis tests. The results of the study indicate that during the period 1990–2024, there was a very significant change in land cover, where secondary dryland forests were almost entirely converted into plantations, settlements, and other non-forest lands. The results of the F test indicate that all physiological variables simultaneously had a significant effect on land cover changes (p<0.05). The Adjusted R Square value of 0.652 indicates that the observed physiological variables can explain 65.2% of the variation in land cover change. Partially, only stress levels significantly influence land cover change with a significance value of 0.003 and a beta coefficient of 1.120. These results indicate that stress levels are the most sensitive physiological indicator in responding to habitat changes. Therefore, conservation efforts for Sumatran Elephants at the TWA Holiday Resort need to be directed at habitat restoration and reducing anthropogenic pressures to maintain the welfare and sustainability of the elephant population in the area.

Page 15 of 15 | Total Record : 147

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