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All Journal Gorontalo Journal of Forestry Research Indonesian Journal of Forestry Research Jurnal Wasian
Adzkia, Ulfa
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Environmental Science Physics 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.
PHYSICAL AND MECHANICAL PROPERTIES OF ROYAL PALM (Roystonea regia (Kunth O.F.Cook) as a COMPOSITE REINFORCING MATERIAL Adzkia, Ulfa; Hasanuddin, Hasanuddin; Nugroho, Naresworo; Karlinasari, Lina
Gorontalo Journal of Forestry Research VOLUME 8 NOMOR 1 TAHUN 2025 GORONTALO JOURNAL OF FORESTRY RESEARCH
Publisher : Universitas Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32662/gjfr.v8i1.3995

Abstract

The Royal Palm (Roystonea regia) is a type of monocotyledonous plant that is widely planted, especially as an ornamental plant that is part of the urban landscape. However, in its growth, there is a natural cycle where the royal palm leaves will fall and end up as waste. In this case, the royal palm leaf sheath is thought to have potential as a composite reinforcement material. However, in its utilization as a composite reinforcement material, basic information such as the physical and mechanical characteristics of the material needs to be known. The purpose of this study was to evaluate the physical and mechanical properties and potential utilization of the royal palm leaf sheath. The research shows that the green royal palm leaf sheath's water content and density are higher than the brown leaf sheath. In addition, the dimensional stability of the green leaf sheath is higher than that of the brown leaf sheath. The tensile strength of the green conditions is lower than that of the brown conditions, and the strength decreases towards the core of the royal palm leaf sheath. Meanwhile, the tensile strength of the fibers from the two leaf sheath conditions is not significantly different. This test shows that the royal palm leaf sheath fiber is classified into fiber class II. This shows that the royal palm leaf sheath has the potential as a composite reinforcement material.
Individual Tree Segmentation in TropicalNatural Forest Based on Point CloudGenerated from UAV RGB Image Irlan, Irlan; Adzkia, Ulfa; Suhartono, Suhartono; Meliani, Meliani; Jenos, Alpri Sri; Bimantara, Teguh; A, Chairil
Jurnal Wasian Vol. 12 No. 02 (2025): December
Publisher : Forestry Department, University of Muhammadiyah Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62142/kx7bhn83

Abstract

Different techniques have been developed for segmenting individual trees using point clouds from UAVs and other remote sensing technologies. A more accurate and reasonably priced method is still required, nevertheless, especially for tropical natural forests. This study evaluates the accuracy of individual tree segmentation using point clouds derived from RGB images in Indonesian natural forests. Compared to other sensors like LiDAR, RGB-based point clouds are significantly more cost-effective. We employed a point cloud-based segmentation algorithm, which has demonstrated superior performance over raster-based or hybrid methods. The results show that this approach is feasible for segmenting individual trees, although it tends to produce over-segmentation. This was attributed to the constraints of incomplete ground measurements resulting from dense canopy cover. The method achieved an overall segmentation accuracy of r (0.68), p (0.76), and F (0.72). Tree position accuracy had an RMSE of 1.95 meters, while the RMSE for crown radius was 1.59 meters. Future work will focus on enhancing the quality of RGB point clouds and improving algorithms to increase segmentation accuracy in natural forests.
Co-Authors A, Chairil Ayyasy, Yahya BIMANTARA, TEGUH Fifi Gus Dwiyanti Hasanuddin Hasanuddin Henti Rosdayanti, Henti Irlan ISKANDAR ZULKARNAEN SIREGAR Jenos, Alpri Sri KUSUMADEWI SRI YULITA Lina Karlinasari Meliani, Meliani Muharam, Karima Fauziah Naresworo Nugroho Rachmat, Henti Hendalastuti Rahman, Mohamad Miftah Suhartono