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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 136 Documents
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Vegetation Diversity and Conservation Status in the Green Space of the Faculty of Medicine, University of Indonesia Deanova Frestiana Br. Pelawi; Tazkiyatul Syahidah; Harto; Rizmoon Nurul Zulkarnaen
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.18192

Abstract

Green space enhances environmental quality and maintains ecosystem balance in urban areas. This study examines the vegetation in the green space at the Salemba and Cikini campuses and assesses species diversity and conservation status based on the IUCN Red List. A total of 514 individual plants, representing 107 species from 38 families, were recorded, with dominant species including Monoon longifolium, Terminalia neotaliala, and Thyrsostachys siamensis. Species diversity analysis revealed a Shannon-Wiener index (H') of 4.07, Simpson's index (D) of 0.97, and evenness (E) of 0.87, indicating high diversity and a well-distributed plant community. Among the species identified, 61 individuals from 6 species were classified as threatened, including 2 Critically Endangered, 24 Endangered, and 35 Vulnerable individuals. These findings highlight the urgency for enhanced conservation efforts to prevent the extinction of these species. Sustainable management strategies should integrate both ecological and social factors, emphasizing biodiversity-focused interventions, public participation, and strategic conservation planning. This study underscores the need for comprehensive vegetation management and increased public awareness to preserve urban biodiversity and support broader sustainability initiatives.
Estimation of Forest Biomass and Carbon Stocks Changes in Sunt (Acacia nilotica Linn Willd.) Plantations, Sinnar State, Sudan Abubakr A. A. Osman; Brolly Gabor; Kiraly Geza
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.18955

Abstract

This study quantifies changes in tree density, above ground biomass (AGB) and above ground carbon (AGC) in Seiro Riverine Forests (SRF) and Abutiga Riverine Forest (ARF)we use inventory data done by forest national corporation (FNC) in 2006 and reinventors in 2015for this research. A total of 224 circular sample plots (1000 m² each), 129 in Seiro and 96 in Abutiga, were established using a systematic sampling grid method. The distance between plots was 100 m, and between survey lines, 200 m. In each plot, all living trees were identified and counted, and their diameters at breast height (DBH) were recorded. The findings revealed a significant reduction in average tree density, dropping from 93 to 40 trees/ha in SRF, and from 140 to 40 trees/ha in ARF. (AGB) and (AGC) were assessed in Acacia nilotica plantations of varying ages in Abutiga and Seiro forests. Garef consistently showed the highest biomass and carbon stocks, Maya the lowest, and Karb intermediate values. Similar trends were observed across older and younger stands, highlighting strong site-specific differences. These results emphasize the importance of targeted management to sustain carbon storage and enhance the ecological function of Acacia nilotica plantations.
Biodiversity and Ecosystem Status of Mangroves in the Belawan Estuary, North Sumatra Province, Indonesia Muhtadi, Ahmad; Leidonald, Rusdi; Fadhilah, Amanatul; Habibi, Arya Yusuf; Manalu, Natasya Rebekka; Nasution, Decy M. Carolina; Pulungan, Parhan; Begum, Salma
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.19749

Abstract

Estuaries function as sediment deposition zones that provide essential substrates for mangrove development. Consequently, estuaries and mangroves constitute integral components of coastal ecosystems. The mangrove ecosystem in the Belawan Estuary, North Sumatra Province, is increasingly threatened by rapid urban expansion in Medan City. This study aimed to assess mangrove biodiversity, structural characteristics, and ecological status in the Belawan Estuary. Field surveys were conducted in November 2023 across 28 sampling stations representing seaward, middle, and landward sections of the estuary. Vegetation data were analyzed using density, diversity, evenness, dominance, and Importance Value Index (IVI). A total of 26 mangrove species were recorded, comprising 21 true mangrove species and 5 associated species. The most widely distributed species were Avicennia marina, Avicennia lanata, and Nypa fruticans. Mangrove density ranged from 533 to 2,733 ind ha⁻¹, with an average of 1,420 ind ha⁻¹. Shannon–Wiener diversity values ranged from 0.04 to 1.95, indicating relatively low diversity in several landward stations dominated by N. fruticans. Although the overall condition of mangroves in the Belawan Estuary is classified as good, the ecosystem remains highly vulnerable to land-use conversion under the revised spatial planning framework. Strengthening conservation-oriented spatial policy is therefore essential to ensure long-term ecosystem sustainability.
Analysis of Land Cover Change: Case Study in Concession Area of PT. GRUTI Unit Tele I North Sumatra Latifah, Siti; Zulkarnain Batubara; Anita Zaitunah; Seca Gandaseca
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.20138

Abstract

Changes in cover are the result of human activities and natural phenomena. Land cover in an area always changes over time. This study aims to identify and analyze the condition of land cover in 2013 and 2023 in the concession area of ​​PT. GRUTI Unit Tele I obtained through guided classification using ArcGIS 10.4 software and Microsoft Excel. The results of the study showed that throughout 2013-2023 in Unit Tele I there was a change in the area of ​​forest from 14,468.85 ha to 14,138.91 ha. In non-forest areas, there is an increase in area from 443.43 ha to 874.98 ha, and open areas have decreased from 410.22 ha to 402.21 ha. Changes in land cover are dominated by land occupation by the community due to a lack of supervision from concession managers and the absence of production activities in the area.
Land Use Change Modeling to Support the Management Plan of Protected FMU Unit II FMU Region XV Kabanjahe Fauziah Sahara; Anita Zaitunah; Bejo Slamet
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.20518

Abstract

Deforestation results in environmental degradation, so it is necessary to conduct a study to determine land use changes that occur and predict land changes with appropriate directions to support the Protected FMU Unit II FMU Region XV Kabanjahe management plan. This study aims to analyze changes and predictions of land use in 2013-2033, factors that influence land use change, and formulate directions for land use plans in Protected FMU Unit II FMU Region XV Kabanjahe. This research uses a Geographic Information System approach with the Artificial Neural Network (ANN) method prediction model. Factors driving land use change as model inputs consist of distance to road, distance to permit, distance to settlement, distance to river, elevation, geology, soil type, and slope. The results showed that there has been a decrease in dryland forest by 6,957 ha in the 2013-2018 period, and the driving factor that has the highest degree of relationship based on the results of the correlation test is the distance to the road, which is 0.2444. The land use change prediction model has an accuracy of 89.42% based on Kappa Index Agreement (KIA). The direction of the land use plan in Protected FMU Unit II FMU Region XV Kabanjahe in 2033 consists of Protected Forest Area which has the largest area, namely 64,678 ha, Production Forest covering 7,077 ha, and Limited Production Forest covering 9,278 ha.
Assessment of Healing Forest Potential for Nature-Based Tourism in Bogor Botanical Gardens Riswan, Arbi Pangestu; Hasibuan, Ratna; Sasongko, Dwi Agus
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.20693

Abstract

Healing forest activities, such as Bogor Botanical Gardens, have become increasingly popular among urban communities, especially those experiencing stress or seeking peace. Healing forests offer a calming effect on the body, soothe the mind, and create a sense of comfort that can help lower stress levels through relaxation activities immersed in nature (natural healing). This study aimed to identify potential areas suitable for forest-healing activities based on the standards outlined in the SNI 9006:2021. This study uses a mixed-method approach combined with field observations. The collected data were analyzed using a descriptive method. The results showed that one location, Area Six, has a strong potential for Healing Forest activities. Based on on-site analysis, activities that can be carried out in this area include yoga, forest walks, tree-hugging, and simply enjoying natural surroundings.
Phytoconstituents and Antioxidant Profiling of Avicennia marina (Forsk.) Vierh. Heartwood Extract Sourced from Bagan Kuala: A Novel Natural Source for Radical Scavenging Applications Reveny, Julia; Rahayu, Firdha Sekar; Yuandani
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.20826

Abstract

Avicennia marina (Forssk.) Vierh., commonly known as 'api-api' or white mangroves, are woody shrubs and tropical plants that inhabit mangrove ecosystems, which occur at the interface between terrestrial and marine environments. Salinity is a critical environmental factor in mangrove habitats. Plants growing in such extreme conditions exhibit elevated concentrations of specific antioxidant compounds. Various parts of plants, including heartwood, are known to contain an abundance of extractive components compared to sapwood. Objective: This study was the first to evaluate the antioxidant activity of A. marina heartwood extract. Method: The applied method of sample extraction comprises ethanol-based maceration, qualitative phytochemical analysis based on observable visual changes, and the assessment of antioxidant activity employing the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay using UV-Vis Spectrophotometry. Result: heartwood extract of Avicennia marina exhibits phytochemical constituents that comprise alkaloids, tannins, saponins, triterpenoids, and flavonoids. The antioxidant capacity of the extract showed strong antioxidant activity with an IC50 value of 61.50 µg/mL (R2 = 0,9962). Conclusion: The current study confirms the promising antioxidant activities of Avicennia marina heartwood sourced from Bagan Kuala. These marine biological resources can be explored further as an ailment for degenerative disease induced by Reactive Oxidative Stress (ROS), which can be made into an oral supplement or topical preparations, thus generating a greater economic value.
Synergistic Effects of Calliandra and Biomass Additives on the Fuel Quality of Biopellets for Sustainable Energy Mustaghfirin, Mustaghfirin; Hermawan, Dede; Sarip Nawawi, Deded; Surya Kusumah, Sukma; Ferdiansyah, Muhammad; Raditya Bagus Surya Kelana, I Putu; Saputra Pardede, Alvian; Rizqi Abdul Aziz, Salman; Oki Putri Damanik, Cimmi
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.21193

Abstract

The growing demand for renewable energy has driven the utilization of biomass as an environmentally friendly alternative energy source. This study aims to develop high-quality biopellets based on Calliandra calothyrsus wood by incorporating Eichhornia crassipes (water hyacinth) and Melaleuca cajuputi (cajuput leaf waste) to enhance combustion efficiency and reduce ash content. Five biomass formulations were evaluated: pure calliandra, pure water hyacinth, pure cajuput leaves, calliandra–water hyacinth (75:25), and calliandra–cajuput leaves (75:25). The produced biopellets were analyzed for their physical characteristics, calorific value, and proximate properties, including moisture content, volatile matter, ash content, and fixed carbon. Results showed that the calliandra–cajuput mixture yielded the best performance, with a density of 0.84 g/cm³, low ash content (2.65%), and a high calorific value (18.2 MJ/kg). The addition of water hyacinth reduced volatile matter but increased ash content. The biopellets from the calliandra–cajuput blend met the SNI 8675:2018 standard for both household and industrial use. This study demonstrates that the integration of locally available biomass waste can significantly improve biopellet quality while supporting sustainable waste management and renewable energy diversification.
Tourism Carrying Capacity of Coastal Ecosystems on Ketawai Island, Central Bangka, Indonesia Priyansah, Sujadi; Erny Poedjirahajoe; Lies Rahayu Wijayanti Faida
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.21359

Abstract

Ecotourism development, especially in Central Bangka Island of Ketawai more rapidly. The rapid tourist activities on the Island of Ketawai can cause loss of quality attractions for damage to the ecosystem. This is because the pressure on the environment caused by the increased number of tourists. This study aims to determine the  maximum capacity rating  with ratings of three aspects:  (1) the carrying  capacity  of  the  region  (DDK),  (2)  the  carrying  capacity  of  the environment (the carrying capacity of the physical / PCC and the carrying capacity of the real / RCC), and (3) ecological carrying capacity (AR). This  study  uses  primary  data  by  direct  observation  in  the  field  and secondary data from relevant agencies. An assessment of the carrying capacity of the region (DDK), an assessment of the carrying capacity of the environment using methods the Physical Carrying Capacity (PCC), the carrying capacity of the Real (RCC), and an assessment of the ecological carrying capacity (AR). The  results  obtained,  there  are  two  tourist  activity  on  the  island  of Ketawai are picnic and camping. The result of the carrying capacity of the region (DDK) for picnic activities is 240 people / day and camping activities is 900 people/day. The  results  of the  physical  carrying  capacity (PCC)  for  picnic activities is 249 people / day and for camping is 100 people / day. Assessment of the real carrying capacity (RCC) for picnic activities is 239 people / day and camping 96/day. Ecological carrying capacity assessment. (AR) obtained the results of 81 people / day for a picnic and activity type 43 / day for camping activities. The value of these calculations are still well above the actual number of tourists who currently account for 9 person / day. Attraction Development Ketawai Island can still be optimized however, by taking into account the balance and sustainability of the local environment.
Optimizing Nitric Acid Leaching Conditions for Ash and Potassium Reduction in Empty Fruit Bunches-Based Biomass Energy Santosa, Dwi Jaksana Megah; Hermawan, Dede; Surya Kusumah, Sukma; Nawawi, Deded Sarip; Sutiawan, Jajang
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.23044

Abstract

Oil palm empty fruit bunches (EFB) represent an abundant biomass waste in Indonesia with high potential as a solid biofuel. However, the high ash content and the presence of alkali metals such as potassium in EFB contribute to low combustion efficiency and increase the risks of fouling and slagging. This study aims to reduce the ash and potassium content in EFB-based biomass fuel through demineralization using nitric acid (HNO₃). Acid demineralization was conducted using various acid concentrations (1%, 3%, and 5%) and soaking durations (10, 30, and 60 minutes). The parameters analyzed include ash content, calorific value, potassium content, as well as proximate and ultimate analysis. The results indicate that demineralization using 1% nitric acid for 10 minutes is the optimum condition, successfully reducing the ash content from 7.93% to 3,43% and reduced potassium by 77% (0,087%- 0,02%). In addition, the fix carbon increased (16,11%-18,09%), sulfur decreased (0,115%-0,086%), and the calorific value increased to 4355,83 cal/g. This treatment also increased the carbon and hydrogen content while reducing sulfur content, thereby improving thermal quality and reducing emissions. Acid demineralization using low-concentration nitric acid is effective in reducing ash and potassium content, thereby enhancing the performance of EFB-based biopellets as a biomass energy source.

Page 13 of 14 | Total Record : 136

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