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Junaedi, Ajun
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Agriculture, Biological Sciences & Forestry

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Komposisi Vegetasi, Keanekaragaman Jenis, Dan Pola Dispersi Tumbuhan Langka Pada Kawasan Laboratorium Alam Lahan Gambut Universitas Palangka Raya: The composition of vegetation, species diversity, and dispersion patterns of rare plants in the Natural Peatland Laboratory Area of the University of Palangka Raya Setiarno, Setiarno; Nababan, Suzet Rotua Tasya; Hidayat, Nisfiatul; Rotinsulu, Johanna Maria; Junaedi, Ajun
HUTAN TROPIKA Vol 20 No 1 (2025): Volume 20 Nomor 1 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i1.20219

Abstract

This research aims to describe and analyze species composition, species diversity, and dispersion patterns of rare plants, particularly those classified as critically endangered, in the Natural Laboratory of Peatland Palangka Raya University. Vegetation data collection was conducted using the quadrat plot technique based on a purposive systematic sampling. The data in the research plots were analyzed using Microsoft Excel, referring to the Important Value Index (IVI), species dominance index, diversity index, evenness index, and dispersion index. This research identified 47 types of plants (the total number of plants at the seedling, sapling, pole, and tree levels) categorized into 38 genera and 27 families. There were rare plants fall into critically endangered or endangered, namely ramin (Gonystylus bancanus) and nyatoh (Palaquium bintuluense). Nyatoh (Palaquium bintuluense), jambu-jambu (Eugenia spp.), and mangkinang (Elaeocarpus stipularis BI.) were almost always among the top five dominant species from the seedling stage to the tree stage at various peat thickness levels, but there was no concentration of species dominance in the plot. The majority of the species diversity index values (Shannon-Wiener) in the plots were classified as high (H’>3), indicating that the forest ecosystem conditions at the location are relatively stable. The evenness index of species in all plant communities and peat thickness levels fell into almost uniform abundance category (E = 0.76 – 0.95). The dispersion pattern of the population of critically endangered rare plants, such as Gonystylus bancanus (Mig.) and Palquium bintulense, at various peat thickness levels was clustered. In terms of growth stages, the population of Palquium bintulense was entirely clustered, while that of Gonystylus bancanus (Mig.) was only clustered at the sapling stage, but at the seedling and pole stages, it had random pattern.
Keanekaragaman Jenis Amfibi pada Habitat Terestrial dan Akuatik di KHDTK Hutan Pendidikan Hampangen Kalimantan Tengah : Amphibian Diversity in Terrestrial and Aquatic Habitats in The Hampangen Educational Forest KHDTK Central Kalimantan Purba, Crysia Lenchiana; Rizal, Moh; Octavianus, Robby; Junaedi, Ajun; Sudomo, M. Fadhil A
JURNAL HUTAN TROPIKA Vol 20 No 2 (2025): Volume 20 Nomor 2 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i2.22714

Abstract

The purpose of this study was to identify amphibian species in terrestrial and aquatic habitats and to analyze species diversity, species richness and species evenness indices in the Hampangen Educational Forest (KHDTK). The method used was strip transect observation with a transect length of ±400m and a left-right width of 5m. The selection of transects was done using purposive sampling. The results of the study showed that there were 7 species of amphibians found and identified in terrestrial and aquatic habitats from 3 families (Ranidae, Dicroglossidae, Rhacophoridae). The Shannon-Wiener diversity index (H’) for amphibian species in terrestrial habitats was 1.790 (moderate category) and in aquatic habitats was 1.078 (low category). The species richness index for amphibians in terrestrial and aquatic habitats is in the low category, with values of 0.291 and 0.513, respectively. Meanwhile, the species evenness index in terrestrial and aquatic habitats is in the high category, with values of 0.920 and 0.982, respectively. Keywords: amphibians, species diversity, terrestrial, aquatic, KHDTK
Karakteristik Vegetasi pada Areal Berhutan di Sekitar Hak Guna Usaha Perkebunan Kelapa Sawit: Vegetation Characteristics in Forest Areas Surrounding Palm Oil Plantation Concession Area Setiarno, Setiarno; Junaedi, Ajun; Hartati, Bunga Resa; S, Muhammad Luthfi
JURNAL HUTAN TROPIKA Vol 20 No 2 (2025): Volume 20 Nomor 2 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i2.23116

Abstract

This study was aimed to analyze and describe the characteristics of vegetation in forested areas in and around the Cultivation Rights area of oil palm plantations (PT. GAP and PT. CWJU). Vegetation data was collected using a quadratic plot technique, where the plot itself was assigned using purposive systematic sampling. Vegetation data in the research plots were analyzed using Microsoft Excel by involving index calculations, namely the Important Value Index/INP or Important Species Value/NPJ, species dominance index, diversity index, richness index, evenness index, and species similarity index. The results of the study in the observation plots have recorded 43 species of woody plants that can be grouped into 34 genera and 21 families. Eugenia uniflora and Shorea macrantha at the research site are more dominant in all growth phases. It is indicated that there is no concentration of dominance by a species in the research plot (C = 0.10 – 0.14), the H’ value is classified as moderate/moderate stability (1 < H’ < 3.22) which reflects sufficient species diversity and relative abundance, the richness index ranges from 1.90 – 2.32 which is generally low (R < 3.5), the evenness index ranges from fairly even to almost even (E = 0.62 – 0.94), and the species similarity index of 0.61 is classified as moderate. Keywords: vegetation, plant species, plant community
Potensi Limbah Penebangan dan Pola Bentuk Penampang Tunggak Pohon pada Kegiatan Pemanenan Kayu di Hutan Alam Produksi Kalimantan Tengah: The Potential of Logging Waste and the Cross-Sectional Shape Patterns of Tree Stumps in Timber Harvesting Activities in Production Forests in Central Kalimantan Imanuel, Ricky Tri; Junaedi, Ajun; Yosep, Yosep; Dwiastuti, Rini; Yanciluk, Yanciluk; Rizal, Moh
JURNAL HUTAN TROPIKA Vol 20 No 2 (2025): Volume 20 Nomor 2 Tahun 2025
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v20i2.23189

Abstract

The objectives of this study were (a) to calculate the volume, percentage, and potential of tree felling waste; and (b) to identify the cross-sectional patterns of tree stumps in timber harvesting activities in the production forests of Central Kalimantan. Measurements of logging waste and observations of tree stump cross-sectional shapes were carried out on 60 predetermined sample trees located within 10 observation plots (10 ha). The results showed that the volume of logging waste was 106.42 m3 or 31.82% with a waste potential of 10.64 m3/ha. The patterns of stump cross-sections found in the logging plots consisted of several shapes, namely: star-shaped, triangular, round, irregular round, and square.
Co-Authors Aruan, Jenifer Gimson Luhan Hartati, Bunga Resa Hendra Toni Hidayat, Nisfiatul Hidayat, Ricky Dwi Imanuel, Ricky Tri Indrayanti, Lies Johanna Maria Rotinsulu K. Firdara, Eritha Madiyawati, Milad Moh. Rizal, Moh. Mujaffar, Ahmad Nababan, Gabriella SN Nababan, Suzet Rotua Tanya Nababan, Suzet Rotua Tasya Penyang, Penyang Purba, Crysia Lenchiana Raden Mas Sukarna, Raden Mas Rini Dwiastuti Rizal, Moh Robby Octavianus S, Muhammad Luthfi Saputra, Jodi Saragih, Harry Martua Sari , Nurmila Setiarno Setiarno, Setiarno Sinaga, Fani Delima Sari Sopya, Sopya Sosilawaty, Sosilawaty Sudomo, M. Fadhil A Surasana, I Nyoman Tanduh, Yusinta Yanciluk, Yanciluk Yosep Yosep Yulianti, Reri