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All Journal HAYATI Journal of Biosciences MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Jurnal Ilmu Pertanian Indonesia MEDIA KONSERVASI Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences Jurnal Ilmu Lingkungan Indonesian Journal of Applied Sciences BIOTROPIA - The Southeast Asian Journal of Tropical Biology Jurnal Ilmu Komputer dan Agri-Informatika Jurnal Penelitian Hutan dan Konservasi Alam Jurnal Penelitian Hasil Hutan JURNAL PEMULIAAN TANAMAN HUTAN JURNAL PERBENIHAN TANAMAN HUTAN AGRIVITA, Journal of Agricultural Science Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) International Journal of Advances in Intelligent Informatics JURNAL BIOLOGI INDONESIA ZOO INDONESIA Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Indonesian Journal of Chemistry Forest and Society Jurnal Ilmu dan Teknologi Kayu Tropis Journal of Sylva Indonesiana Jurnal Penelitian Hasil Hutan Zoo Indonesia JURNAL HUTAN TROPIS Journal Of Sustainability Perspectives Jurnal Komputer Teknologi Informasi Sistem Komputer (JUKTISI) Journal of Sustainability Perspectives Policy Brief Pertanian, Kelautan, dan Biosains Tropika Indonesian Journal of Forestry Research Jurnal Penelitian Hasil Hutan
ISKANDAR ZULKARNAEN SIREGAR
Department Of Silviculture, Faculty Of Forestry, Bogor Agricultural University, Academic Ring Road Campus IPB Dramaga, PO Box 168, Bogor 16680, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Public Health Social Sciences Veterinary Other

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GROWTH AND WOOD TRAITS EVALUATION OF 15-YEAR-OLD TENGKAWANG (Shorea spp.) TREE STANDS IN GUNUNG WALAT UNIVERSITY FOREST, WEST JAVA, INDONESIA Fifi Gus Dwiyanti; Rosdayanti, Henti; Yulita, Kusumadewi Sri; Rachmat, Henti Hendalastuti; Ayyasy, Yahya; Muharam, Karima Fauziah; Rahman, Mohamad Miftah; Adzkia, Ulfa; Siregar, Iskandar Zulkarnaen
Indonesian Journal of Forestry Research Vol. 11 No. 2 (2024): Indonesian Journal of Forestry Research
Publisher : Association of Indonesian Forestry and Environment Researchers and Technicians

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59465/ijfr.2024.11.2.243-258

Abstract

Gunung Walat University Forest (GWUF) in Sukabumi Regency, Indonesia, plays a crucial role in providing various ecosystem services. Five important Shorea trees, i.e., S. stenoptera, S. mecisopteryx, S. pinanga, S. palembanica, and Shorea leprosula have been planted in GWUF as an effort for its conservation and object of research. An evaluation of the adaptability and suitability of these species to the GWUF ecosystem, as well as their wood characteristics, needs to be carried out regularly. Therefore, the study aimed to examine the growth performances and physical wood properties of five Shorea species, i.e., Shorea stenoptera, S. mecisopteryx, S. pinanga, S. palembanica, and S. leprosula at the age of 15-year-old planted in GWUF. The results indicated that S. leprosula exhibited the best growth performance in terms of average diameter (19.64 cm), volume (0.27 m3), slenderness (126.58), and wood density (0.94 g/cm3), and S. stenoptera showed the best performance in average height (23.35 m). While the poor performance was shown by S. palembanica in terms of average diameter (6.73 cm), height (11.15 m), volume (0.02 m3), wood density (0.87 g/cm3), and specific gravity (0.45), and S. stenoptera in terms of average slenderness (202.73). In addition, significant differences in tree height, diameter, volume, wood density, specific gravity, and moisture content were found in S. palembanica compared with other species. The relationship between the growth and physical wood properties parameters varied between species. The study revealed that planting the five Shorea species in GWUF is suitable for increasing vegetation cover and conserving the species.
Development of Few Significant SNP Markers from Transcriptomic Data for Selection of Sengon (Falcataria falcata (L.) Greuter and R. Rankin) Resistant to Boktor Stem Borer and Gall Rust Disease Nugroho, Aditya; Anita, Vilda Puji Dini; Matra, Deden Derajat; Siregar, Iskandar Zulkarnaen; Siregar, Ulfah Juniarti
HAYATI Journal of Biosciences Vol. 31 No. 1 (2024): January 2024
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.31.1.110-125

Abstract

Sengon (Falcataria falcata (L.) Greuter and R. Rankin) plantations in Indonesia are threatened by attacks from Boktor stem borers and gall rust disease. Controlling pests and diseases is difficult therefore, planting resistant trees obtained from tree selection programs is necessary. Currently, genomic breeding often incorporates GWAS, which uses thousands of SNP markers to identify markers with significant associations with the traits studied. This study aimed to bypass such expensive studies by identifying and developing SNP markers from sequences of putative resistance genes to Boktor stem borer and gall rust disease, identified from sengon transcriptomic data analysis. A total of 496,194 putative SNP sites were identified from transcriptomic sequences using the SAMtools and BFCtools programs, of which 119 SNP sites were associated with resistance genes. Of the 101 non-synonymous SNPs selected, only 12 were located in the conserved domain of each gene and were used for primer design. Of the 13 primers designed, only 10 were successfully amplified. Validation of 10 developed SNP markers on 100 sengon accessions using the HRM method confirmed a significant association between SNP markers and resistance traits, with a -log 10 (P-value) between 10.49 and 16.63. A few SNPs markers developed from putative resistance gene sequences are associated with resistance traits in sengon. Therefore, the SNP markers could be applied in selection programs for sengon trees resistant to Boktor stem borers and gall rust disease.
Implementasi Sistem Pendukung Keputusan Metode SWARA untuk Pemilihan Laptop Low-End Terbaik 2024 Bagi Programmer Situmorang, Rizki Andista Pandapotan; Rangkuti, Reyhan Abdillah; Siregar, Iskandar Zulkarnaen; Divi Handoko
Jurnal Komputer Teknologi Informasi Sistem Informasi Vol. 3 No. 3 (2025): Februari 2025
Publisher : LKP KARYA PRIMA KURSUS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62712/juktisi.v3i3.290

Abstract

The selection of low-end laptops for programmers requires consideration ofvarious criteria, such as technical specifications, price, durability, and performance. Thisstudy develops a Decision Support System (DSS) based on the Step-wise WeightAssessment Ratio Analysis (SWARA) method to assist users in determining the best laptopin 2024. The SWARA method is employed to calculate the weights of criteria in astructured manner, involving expert and user assessments. This process includesidentifying key criteria such as processor, RAM, storage capacity, battery life, and price.The evaluation results show that this method can provide accurate and relevantrecommendations. The SWARA-based DSS is expected to be a practical solution for noviceprogrammers with limited budgets, while also contributing to the advancement ofdecision support systems in the field of information technology.
PEMANFAATAN JELUTUNG (Dyera spp.) OLEH SUKU ANAK DALAM DI TAMAN NASIONAL BUKIT DUABELAS , JAMBI ., Aminah; Zuhud, Ervizal A.M.; Siregar, Iskandar Z.
Media Konservasi Vol. 21 No. 2 (2016): Media Konservasi Vol. 21 No. 2 Agustus 2016
Publisher : Department of Forest Resources Conservation and Ecotourism - IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (466.055 KB) | DOI: 10.29244/medkon.21.2.168-173

Abstract

Anak Dalam Tribe (Suku Anak Dalam; SAD) used jelutong in their daily live. But nowadays, jelutong population was reduced. Increase the forest change area decrease the habitat preference of jelutong. It need the strategy and technique to conservation jelutong without conflict with local people interest. Traditional management of jelutong among SAD in Bukit Duabelas National Park (Taman Nasional Bukit Duabelas; TNBD) benefits to understanding technique used of jelutong latex and understanding ecological knowledge SAD for strategy of conservation jelutong, among  other are to described  jelutong population status in TNBD. The research was conducted by using focus group discussion and indepth interview 40 respondent to examine management and use of jelutong. In addition, vegetation analysis was also conducted to determine the status of jelutong population by 8 sampling plots with census technique in 2,88 ha area. It was determined that SAD use latex of jelutong especially for comodity. Traditional technique applied to all methods tapping, production, and marketing latex. Time latex tapping done in early morning on 5 to 6 am because sunrise decreased latex production. Latex mixed with samak (Syzygium pyrifolium) or vinegar 61, allowed to stand until thickened and forming lumps fit the mold. The local management of this species is based on simple maintenance and tapping latex of individuals in the swamp area, dryland area and homegardens agroforest.The structure of jelutong population in TNBD was destructed which are distribution number of jelutong per ha young stage less than mature stage. Keywords: Anak Dalam Tribe, bioprospecting, conservation, Dyera spp., ethnobotany
Biological constraint in digital data encoding: A DNA based approach for image representation Muttaqin, Muhammad Rafi; Herdiyeni, Yeni; Buono, Agus; Priandana, Karlisa; Siregar, Iskandar Zulkarnaen; Kusuma, Wisnu Ananta
International Journal of Advances in Intelligent Informatics Vol 11, No 3 (2025): August 2025
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijain.v11i3.1747

Abstract

Digital data encoding is crucial for communication and data storage, but conventional techniques, such as ASCII and binary coding, have drawbacks in terms of processing speed and storage capacity. A potential substitute with parallel processing and high-capacity storage is DNA-based data encoding. The goal of this research is to develop a digital data encoding technique based on DNA, while considering biological constraints such as homopolymer and GC-content. The process involves converting image pixel values into binary format, followed by encoding into DNA sequences, ensuring they meet biological constraints. The validity of the resulting DNA sequences is assessed through transcription and translation processes. Additionally, Multiple Sequence Alignment analysis is conducted to compare the similarities between the encoded DNA sequences. The results indicate that the DNA sequences from MNIST images share similar characteristics, reflected in the phylogenetic tree's close clustering. Multiple Sequence Alignment analysis shows that biological constraints successfully preserved the core visual features, allowing accurate clustering. However, this method also faces drawbacks, particularly in the reduction of visual information and sensitivity to changes in image intensity. Despite these challenges, DNA-based encoding shows potential for digital image representation. Further development, particularly the integration of deep learning, could lead to more efficient, secure, and sustainable data storage systems, especially for image data.
The Role of Urban Forest in Providing Landscape Services: A Case Study from Bekasi City, West Java, Indonesia Fredisa, Yoga; Karlinasari, Lina; Kaswanto, Regan L.; Siregar, Iskandar Z.
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 15 No 5 (2025): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.15.5.890

Abstract

Urban forests are critical green infrastructures that provide multiple landscape services, including carbon sequestration, microclimate regulation, and biodiversity support, thereby contibuting to global climate adaption and urban sustainability. This study aimed to analyze the Patriot Bina Bangsa (PBB) Urban Forest’s role in providing comfort through carbon storage and sequestration using the i-Tree Eco model, microclimate monitoring, and evaluating its contribution to landscape services. Data were collected from 12 sample plots using a stand inventory that refers to the i-Tree Eco data collection protocol. An estimated 750 trees, dominated by Nauclea orientalis and Swietenia macrophylla, with a moderate species diversity index (H' = 1.7). The urban forest stored 241 tons of carbon and sequestered 17.85 tons annually, valued at approximately 151 million rupiah. Temperature Humidity Index (THI) values indicate moderate thermal comfort, especially during peak hours. A multifunctional landscape service assessment shows high for regulation functions and landscape disservices, and medium for habitat, information, and production. These findings highlight the importance of urban forests and tree diversity in maintaining landscape services. The indicators outlined in this study provide a basic method for assessing the services provided by urban forest landscapes. It can be used as a tool to improve the management of urban forest systems and monitor the impact of urban greening policies on human well-being in urban landscapes
Modified U-Net for Leaf Segmentation of Eucalyptus pellita Seedlings in Open Natural Environments Alami, Tegar; Herdiyeni, Yeni; Kusuma, Wisnu Ananta; Tjahjono, Budi; Siregar, Iskandar Zulkarnaen
Kinetik: Game Technology, Information System, Computer Network, Computing, Electronics, and Control Vol. 10, No. 4, November 2025
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/kinetik.v10i4.2349

Abstract

This study addressed leaf segmentation in open nursery environments for Eucalyptus pellita seedlings, where fluctuating illumination, cluttered backgrounds, and overlapping foliage had hindered reliable monitoring at operational scale. We proposed a Modified U-Net that integrated a ResNet-50 encoder for high-resolution feature extraction, L2 regularization in the decoder to improve generalization, and a composite binary cross-entropy plus Dice loss to balance pixel-level accuracy with shape conformity. We assembled 2,424 RGB images from an operational nursery and evaluated three architectures (Modified U-Net as the primary model, SegNet, and DeepLabv3+) under cloudy, sunny, and scorching illumination. We conducted inference at native resolution and summarized per-image metrics using medians with interquartile ranges, followed by nonparametric significance testing. The Modified U-Net consistently outperformed the baselines across all scenarios, achieving median Dice coefficients of 0.872 (cloudy), 0.841 (sunny), and 0.854 (scorching), with corresponding Intersection over Union values of 0.773, 0.725, and 0.745. A Kruskal-Wallis test on per-image Dice and Intersection over Union yielded no significant differences across lighting conditions (H = 4.012, p = 0.1345), indicating stable performance under natural illumination variability. Qualitative overlays revealed localized errors, including glare-induced false positives in sunny scenes and shadow-related artifacts under scorching light, which did not materially shift global overlap distributions. We concluded that the proposed architecture delivered robust, high-fidelity segmentation in realistic nursery conditions and provided a practical basis for field deployment, with further gains expected from glare- and shadow-aware augmentation and lightweight optimization for near real-time inference on edge devices.
Microsatellite Identification Based on Genome Assembly Reveals Potentials Marker of Macassar Ebony (Diospyros celebica Bakh.) Majiidu, Muhammad; Matra, Deden Derajat; Dwiyanti, Fifi Gus; Siregar, Iskandar Z
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol 14 No 2 (2024): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Pusat Penelitian Lingkungan Hidup, IPB (PPLH-IPB) dan Program Studi Pengelolaan Sumberdaya Alam dan Lingkungan, IPB (PS. PSL, SPs. IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.14.2.399

Abstract

Macassar ebony (Diospyros celebica Bakh.) is an endemic tree species native to Sulawesi. To date, there are limited comprehensive publications regarding its genome assembly. In this study, we employed paired-end libraries of HiSeq 4000 Illumina, generating 141.2 million paired-end reads (42.4 Gigabases). Our analysis revealed the presence of 950,081 Scaffolds, with an N50 value of 6,023. Notably, BUSCO analysis identified 183 (12.7%) complete and single-copy BUSCOs (S), as well as 9 (0.6%) complete and duplicated BUSCOs (D). Furthermore, we identified 12,890 microsatellites within the Macassar Ebony genome. These microsatellites encompass 14 dinucleotide SSR motifs, 12,090 trinucleotide SSRs, 780 tetranucleotide SSR motifs, and 6 pentanucleotide SSRs. This dataset represents a valuable resource for assessing Macassar Ebony genetic makeup in its natural habitats and for subsequent analyses of the Macassar Ebony genome.
KANDUNGAN MINYAK MALAPARI (Pongamia pinnata (L.) Pierre) DARI PULAU JAWA SEBAGAI SUMBER BAHAN BAKU BIODIESEL Aam Aminah; Supriyanto; Iskandar Zulkarnaen Siregar; Ani Suryani
Jurnal Penelitian Hasil Hutan Vol. 35 No. 4 (2017): Jurnal Penelitian Hasil Hutan
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2017.35.4.255-262

Abstract

Malapari (Pongamia pinnata (L.) Pierre) is one of the most potential biodiesel raw materials to be developed in Indonesia. The plant is natura ly distributed from Sumatera to Papua. However, oil content and its physico-chemical properties of malapari originated from Java was limitedly known. This study investigates chemical composition of malapari seeds, identifies fatty acid composition of the produced seed oil and characterises physico-chemical properties of malapari oil. Composition of chemical content of malapari seeds was analyzed through proximate analysis. Physico-chemical properties of malapari oil were analyzed using the ASTM test method. Results showed that Batukaras population is the best population to be used as biodiesel raw material source because it has the highest value of oil content. Besides, the Batukaras population has the lowest specific gravity, viscosity and acid value. Malapari oil is dominated by oleic and linoleic fatty acids which are potentia ly unsaturated fatty acids for biodiesel. Value of fatty acids (oleic and linoleic) and physico chemical properties (specific gravity and calorific value) of pongamia crude oils suggested that the five populations have been eligible for biodiesel feedstock.
CROSS-AMPLIFICATION OF AQUILARIA CRASSNA MICROSATELLITE DNA MARKERS IN TWO OTHER CLOSELY RELATED AGARWOOD SPECIES (A. MALACCENSIS AND A. MICROCARPA) Irmayanti, Laswi; Dwiyanti, Fifi Gus; Rachmat, Henti Hendalastuti; Yulita, Kusumadewi Sri; Siregar, Iskandar Z.
Indonesian Journal of Forestry Research Vol. 12 No. 2 (2025): Indonesian Journal of Forestry Research
Publisher : Association of Indonesian Forestry and Environment Researchers and Technicians

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59465/ijfr.2025.12.2.209-219

Abstract

Agarwood is a distinctive wood resin product extracted from the important genus of Aquilaria, but the population of agarwood-producing trees from natural forests in Indonesia is threatened due to over-exploitation, leading to an urgent call for conservation and sustainable uses. Molecular techniques such as DNA profiling have been used to ensure the legality, conservation, and sustainability of species from this genus. In this study, cross-species amplification of microsatellite markers initially developed for Aquilaria crassna was developed on two other closely related agarwood species (Aquilaria malaccensis and A. microcarpa), and their genetic variation was evaluated. The four loci (6pa18, 10pa17, 16pa17, and 71pa17) were used to amplify leaf genomic DNA from 55 trees across three Aquilaria species. The results showed that the four loci could successfully be amplified in A. malaccensis, A. microcarpa, and A. crassna. In addition, A. crassna exhibited higher genetic variation (Na=2.75, Ne=2.35, He= 0.5672, and F=-0.727) than A. malaccensis (Na=2.75, Ne=2.19, He=0.5424, and F=-0.598) and A. microcarpa (Na=2.50, Ne=2.11, He= 0.5234, and F=-0.734) indicated the transferability of microsatellite markers in closely related agarwood species, possibly due to the flanking region in these four microsatellite regions being well-conserved in several agarwood species. These findings indicated that the markers tested here can be considered an effective tool for future studies in population and conservation genetics to support the management of agarwood genetic resources and track its supply chain to prevent overexploitation.
Co-Authors . Yulianti Aam Aminah Aam Aminah Abdul Munif Aditya Nugroho Adzkia, Ulfa Agus Astho Pramono Agus Buono Agus Purwito Agus Wahyudi Alami, Tegar Alfi Hudatul Karomah Ali Mukmin Aminah . Andi Sukendro Andry Indrawan Ani Suryani Ani Suryani Anita, Vilda Puji Dini Arida Susilowati Iswanto Arif Satria Arrofaha, Nawwall Atok Subiakto Ayyasy, Yahya Baiquni Rangkuti, Ahmad Basuki Wasis Budi Tjahjono BUDI TJAHJONO Cartealy, Imam Civi Cecep Kusmana Corryanti Corryanti Dede J Sudrajat Dede J. Sudrajat Dede J. Sudrajat Deden Derajat Matra Detty Sumiyati Dida Syamsuwida Dida Syamsuwida Dien Atin Boritnaban Divi Handoko Dodik Ridho Nurrochmat Edje Djamhuri Endah R Palupi Endah Retno Palupi Erdy Santoso Ervizal A.M. Zuhud Ervizal AMZU Eryna Elfasari Rangkuti Fifi Gus Dwiyanti Fifi Gus Dwiyati Fredisa, Yoga Harisson, Rhett D. Hartati Hartati Hartati, N Sri Henti Hendalastuti R., Henti Hendalastuti Henti Rosdayanti Henti Rosdayanti, Henti IBNUL QAYIM Imam Wahyudi Indrawan, Imam Wahyudi IPB, BPKB Irdika Mansur Irsyad Kamal Ishak Yassir Istomo . Karlisa Priandana Kaswanto, Regan L. Kissinger Kissinger Ko Harada Koichi Kamiya Kosasih, Akhmad Kustiyarini, Nur Fadila KUSUMADEWI SRI YULITA Laswi Irmayanti Laswi Irmayanti, Laswi Latifah K. Darusman Latifah K. Darusman Lina Karlinasari Lutfy Abdulah Majiidu, Muhammad Matra, Deden Derajat Mohamad Rafi Mr. Kissinger Muhammad Majiidu Muhammad Rafi Muttaqin Muharam, Karima Fauziah Murdaningsih Haeruman K. Muttaqin, Muhammad Rafi Nasution, Tegar Alami Nelly Anna Nurhasybi Nurhasybi Nurul Khumaida Nyoto Santoso Prijanto Pamoengkas Putra, Heriansyah Rachmat, Henti Hendalastuti Rahila Junika Tanjungsari Rahman, Mohamad Miftah Rangkuti, Reyhan Abdillah RIKA RAFFIUDIN rima siburian Rina Mardiana Septaningsih, Dewi Anggraini Silalahi, Mangarah Siregar, Ulfa Juniarti Siregar, Ulfah J Situmorang, Rizki Andista Pandapotan Slamet, Alim Setiawan Sri Wilarso Budi Supatmi Supatmi Supriyanto Supriyanto Supriyanto Supriyanto Supriyanto Suria Darma Tarigan Suryanto Suryanto Suseno Amien Susila, Susila Syaiful Anwar Syamsidah Rahmawati, Syamsidah Tedi Yunanto Tedi Yunanto Ulfah Juniarti Siregar Ulfah, Mariyana Ulfah, Mariyana Utami, Anisa Dwi Wati, Ridha Wijayanto, Nurheni WINDRA PRIAWANDIPUTRA, WINDRA Wisnu Ananta Kusuma Yayat Hidayat Yulianti Bramasto Zainal Muttaqin