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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Hutan Tropika
Siska, Grace
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Kualitas Biopelet Cabang Kayu Kawui (Vernonia arborea Buch.Ham) Menggunakan Tiga Level Persentase Perekat : Quality of Bio-pellets from Kawui Wood Branches (Vernonia arborea Buch.Ham) Using Three Levels of Adhesive Percentage Indrayanti, Lies; Siska, Grace; Luhan, Gimson; Jesica, Irma
HUTAN TROPIKA Vol 18 No 2 (2023): Volume 18 Nomor 2 Tahun 2023
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v18i2.11964

Abstract

The research aims to determine the quality of bio-pellets from Kawui wood branches using three levels of adhesive percentage. The materials used are branch wood from Kawui and tapioca flour adhesive. The research method employs a Completely Randomized Design with a single factor, namely the adhesive percentage. The factor consists of three levels: adhesive percentages of 10%, 20%, and 30%, with five repetitions. The results indicate that the adhesive percentage does not significantly affect the ash content, volatile matter content, and fixed carbon content, except for calorific value and density. The quality of bio-pellets meets the SNI 8675-2018 standard for household and industrial scales at all adhesive percentages, except for volatile matter content and fixed carbon content. According to French standards, the quality of bio-pellets meets the standards for every parameter except calorific value at the 30% adhesive percentage. According to Swedish standards, the quality of bio-pellets meets the standards for every parameter except moisture content at the 10% adhesive percentage and calorific value at the 30% adhesive percentage. Overall, the 20% adhesive percentage exhibits the best quality
Sifat Fisika Dan Mekanika Papan Partikel Dari Kayu Durian (Durio zibethinus Murr): The Physical and Mechanical Properties of Particle Board from Durian Wood (Durio zibethinus Murr) Indrayanti, Lies; Siska, Grace; Wahyudi, Wahyudi; Setiarno, Setiarno; Sianipar, L.
HUTAN TROPIKA Vol 19 No 1 (2024): Volume 19 Nomor 1 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i1.14275

Abstract

The studi aimed to determine the characteristics particle board of Durian Wood. The material used durian wood which is no longer productive. The adhesive used is PVAc adhesive. The research method used a Completely Randomized Design with a single factor, namely particle size with 3 levels, namely 4.5 and 6 mesh. The parameters tested, namely the physical and mechanical properties of the board, refer to the SNI 03-2105-2006 standard. The results showed that the average water content ranged from 16.94–17.25%, density 0.134–0.145 g.cm-3, water absorption capacity 2.09– 2.50%, thickness expansion 10.93–15.25% , while MoE 65629.90-79209.38 kgf.cm-2, MoR 267.86 – 431.33 kgf.cm-2, internal bond strength 0.08–0.15 kgf.cm-2, Screw holding strength 0.021 –0.035 kgf. Thickness development at the 5 mesh level, Modulus of Elasticity (MoE), and Modulus of Ropture (MoR) have met the SNI 04-2105-2006 standards, while the water content, density, water absorption capacity, internal adhesive strength and Screw holding strength still do not meet the standards set. The highest MoE reached 125,000 kgf.cm-2 and MoR reached 643 kgf.cm-2. The results of mechanical tests show that particle board of durian wood has the potential to be used as interiors construction.
Studi Pendahuluan Kualitas Kayu Hutan Tanaman Eucalyptus Pellita F. Muell dengan Teknologi Modifikasi Panas Oil Heat Treatment (OHT) : Preliminary Study of Wood Quality of Plantation Forest of Eucalyptus pellita F. Muell with Oil Heat Treatment Heat Modification Technology Christy, Eva Oktoberyani; Siska, Grace
HUTAN TROPIKA Vol 19 No 2 (2024): Volume 19 Nomor 2 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i2.18591

Abstract

Indonesia's Industrial Forest Plantations (HTI) cultivate various fast-growing tree species such as Eucalyptus pellita F. Muell. Environmentally friendly and appropriate technologies can be used to improve the weaknesses and deficiencies of wood from HTIs. The Oil Heat Treatment (OHT) process does not use chemicals. This research aims to determine the effect of OHT duration of 0.5 hours, 1.5 hours, and 2.5 hours at a temperature of 200 ± 2°C on the physical properties of Eucalyptus pellita F. Muell. The results showed that the OHT heat treatment using used cooking oil significantly affected the moisture content but did not significantly affect the density
Uji Kualitas Log Kayu Kawui (Vernonia arborea Burch Ham) Setelah Masa Simpan Lima Tahun: Kawui Wood Quality Test after Five Years Storage Indrayanti, Lies; Siska, Grace; Afentina, Afentina; Wardhani, Isna
HUTAN TROPIKA Vol 19 No 2 (2024): Volume 19 Nomor 2 Tahun 2024
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v19i2.18592

Abstract

This study aims to understand physical and mechanical traits of kawui wood after storage period of five years. Further, this study aims to understand how the five years storage period influence the quality of kawui wood, and thus, it ensures the expected standard quality of the wood after longer term of storage. The method used in this study is Complete Randomized Design factorial, whereby the first factor is tree. The second factor is the year which are year 1 (2019) and year 2 (2024). Each of the factor is executed within tree repetition. The making of test samples followed the DIN 52-183 and 52 182 standards. The results show that for the density, MoR and MoE parameters of kawui wood with a storage period of five years is a significant effect except for the water content parameter. The average water content value of the research results was 14%, still within the reference design value of SNI 7973: 2013 which sets the water content at 19%. The decrease in density values showed the same tendency as the decrease in MoR and MoE values. The decrease in MoR value with a storage period of five years ranged from 12.5-25%., while the decrease in MoE value with a storage period of 5 years ranged from 3-6% and was included in the E8 quality of SNI 7973: 2013 regulations
Rekayasa Kayu Eucalyptus pellita F. Muell Dengan Teknologi Oil Heat Treatment (OHT) : Wood Engineering Eucalyptus Pellita F. Muell With Oil Heat Treatment (Oht) Technology Siska, Grace; Christy, Eva Oktoberyani; Sihombing, Markus; Rizal, Moh; Pidjath, Chartina
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.v20i1.20251

Abstract

Eucalyptus pellita F. Muell is a plant that is widely developed in Indonesia's Industrial Plantation Forest (HTI), because this plant is a fast growing wood. Eucalyptus pellita F. Muell wood has weaknesses in terms of durability quality and strength of its wood. Therefore, an environmentally friendly and effective application of technology is needed. Oil Heat Treatment (OHT) is one of the environmentally friendly and appropriate wood technologies because there are no chemicals during the treatment process. This study aims to determine the effect of the duration of OHT time of 1 hour, 2 hours and 3 hours with a temperature of 200 ± 2°C on changes in the physical properties of wood mechanics of Eucalyptus pellita F. Muell. The research results indicate that the heat treatment method known as Oil Heat Treatment (OHT) using used cooking oil can reduce the moisture content of wood over the duration of heating, as well as increase the density, Modulus of Elasticity (MoE), and Modulus of Rupture (MoR) of Eucalyptus pellita F. Muell wood, although the statistical analysis in the study showed that the treatment did not have a significant effect.
Analysis of Potential and Value Chains as a Strategy for Developing Non-Timber Forest Products in Central Kalimantan Forests Yanarita; Afentina; Indrayanti, Lies; Tanduh, Yusintha; Madiyawati, Milad; Pidjath, Chartina; Putir, Patricia Erosa; Siska, Grace
Jurnal Penelitian Pendidikan IPA Vol 11 No 9 (2025): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i9.12664

Abstract

Non-Timber Forest Products (NTFPs) have great potential in supporting the economy of forest communities through sustainable utilization based on local wisdom. This study aims to analyze the potential of NTFPs, identify value chains, and formulate development strategies to improve the welfare of forest communities. The study was conducted in three villages: Tuwung Village, Luwuk Kanan Village, and Sei Gohong Village in Central Kalimantan. The research method used a qualitative and quantitative approach through interviews, observations, Focus Group Discussions (FGDs), and market analysis. The development strategy analysis used SWOT. The results showed that NTFPs: rattan (Calamus spp.), stingless bee honey (Trigona sp.), and medicinal plants: bajakah (Uncaria gambir Roxb.), Dayak onion/lemba onion (Eleutherine bulbosa) are the types of NTFPs most dominantly utilized by the community, both for personal use, sale, or partly for personal use and partly for sale. However, the NTFP value chain is still weak in post-harvest aspects, processing, and market access. The SWOT analysis results show that the NTFP product development strategy falls into Quadrant IV (defensive strategy). This defensive strategy involves rationalizing activities, focusing on one or two potential superior products. Tuwung Village focuses on stingless bee honey, Luwuk Kanan Village on rattan, and Sei Gohong on medicinal plants (bajakah, Dayak onions/lemba onions). Furthermore, strengthening community capacity, improving group institutions, diversifying products, and supporting policies are key to realizing a sustainable NTFP-based economy. This study confirms that value chain development and appropriate strategies for selecting NTFP products are crucial for promoting inclusive and sustainable economic development for communities surrounding forests in Central Kalimantan.
Local Wisdom in Traditional Medicine: Documentation of Medicinal Plants and Utilization by the Forest Community of Tangkahen Village L, Indrayanti; Nuwa; M, Santoso; R, Dwiastuti; Afentina; YR, Sinaga; Yanarita; Siska, Grace
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October: In Progress
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12820

Abstract

Rural communities often rely on medicinal plants for primary healthcare; however, thier knowledge of the diversity and use of these plants is not well documented. This study aims to identify medicinal plant species, their modes of use, and to support the preservation of local cultural wisdom. The research is conducted in the Tangkahen Village Forest, Central Kalimantan, using a 100% exploratory inventory method. Observations are made along three transects representing dense, moderate, and sparse forest cover. Information on plant utilization were obtained through interviews with local traditional healers. This study found 108 individual medicinal plants, representing 16 species from 13 botanical families. The most represented families are Orchidaceae (19%) and Auriculariaceae (13%), with others such as Araceae, Lauraceae, Apocynaceae, and Fabaceae comprising smaller percentages. These plants are used to treat 22 types of ailments, including diabetes, cancer, cardiovascular disease, digestive disorders, and for cosmetic purposes. Preparation methods includes decoction, infusion, topical application of pounded material, and direct consumption. The most commonly used plant parts are leaves, stems, roots, sap, and bark. Some involves combination of 2–3 species. The availability of these plants supports local health needs and presents opportunities for economic development through further processing, thereby indirectly contributing to food security. Further pharmacological studies are needed to analyze their compounds. Cultivation efforts are also essential to ensure the long-term sustainability of these medicinal resources.
Co-Authors Afentina Afentina, Afentina Christy, Eva Oktoberyani Gimson Luhan Indrayanti, Lies Jesica, Irma L, Indrayanti Madiyawati, Milad Nuwa Patricia Erosa Putir, Patricia Erosa Pidjath, Chartina R, Dwiastuti Rizal, Moh Santoso M Setiarno, Setiarno Sianipar, L. Sihombing, Markus Tanduh, Yusintha Wahyudi Wahyudi Wardhani, Isna Yanarita YR, Sinaga