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Sigit Sunarta
Faculty of Forestry, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Energy Environmental Science Materials Science & Nanotechnology

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Karakteristik Energi Limbah Tebangan Jati Klonal dari Paliyan-Gunungkidul Denny Irawati; Aditya Nur Cahyo; Yusi Dian; Joko Sulistyo; Sigit Sunarta; Rini Pujiarti; Ganis Lukmandaru; Johanes Pramana Gentur Sutapa
Jurnal Ilmu Kehutanan Vol 17 No 2 (2023): September
Publisher : Faculty of Forestry Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jik.v17i2.6852

Abstract

Breeding teak with a clonal system was a common practice to enhance productivity and reduce rotation. A private company in Paliyan Sub-District, Gunungkidul Regency, Indonesia, developed Jati Unggul Nusantara (JUN) through vegetative propagation, particularly cloning, using cuttings. JUN had gained widespread popularity as a replacement for conventional teak varieties for commercial purposes. The utilization of JUN commercial timber left various non-commercial biomass forms, such as leaves, branches, and twigs. This research aimed to assess JUN logging waste biomass's energy potential and characteristics across different tree-age stands. This research used non-commercial biomass from six- and eight-year-old trees, including branches, twigs, leaves, stumps, and unmerchantable top stems. The results showed that the average dry weight of JUN logging waste from six- and eight-year-old trees was 31.5 and 53.5 kg/tree, while the calorific value ranged from 4516.4–5177.7 cal/g. This waste had good characteristics as an energy material, specifically from the part of unmerchantable top stems with a high fuelwood value indexof 6579.6.
Sixty Years of UGM Forestry Faculty’s Work in Preserving Indonesia’s Forests and Environment Sigit Sunarta; Kaharuddin Kaharuddin; Dwiko Budi Permadi; Widiyatno Widiyatno; Ragil Widyorini; Greitta Kusuma Dewi; Ari Susanti; Ni Putu Diana Mahayani
Jurnal Ilmu Kehutanan Vol 18 No 1 (2024): March
Publisher : Faculty of Forestry Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jik.v18i1.12543

Abstract

Given a mandate to preserve the Indonesia tropical forest through its education, research, and community service activities, the Faculty of Forestry Universitas Gadjah Mada (FoF UGM) has reached broad stakeholders to support sustainable forest management and climate mitigation (SDG 13 and 17). FoF UGM supports basic and applied research contributing to forestry industrialization (SDG 9), such as improved planting materials for Tectona grandis and Eucalyptus sp. In collaboration with the community (SDG 1 and 2), FoF UGM also diversifies kajuput essential oil produced in Wanagama and UGM teaching forests. Technology innovations such as glue and cross-laminated timber, biodiesel, information systems, and drone technologies for land rehabilitation and carbon accounting represent the institution's commitment to improving Indonesia's forest, forestry, community, and national economy (SDG 13 and 15).
The Importance of Spacing and Thinning to Improve Productivity and Wood Properties of Clonal Teak Plantation Widiyatno; Aris Wibowo; Nur Laily Anisa; Dian Novitasari; Rika Bela Rahmawati; Sawitri; Sigit Sunarta; Suryo Hardiwinoto; Naoki Tani
Jurnal Sylva Lestari Vol. 14 No. 2 (2026): May
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v14i2.1347

Abstract

Clonal teak in Indonesia was produced through a tree improvement program that selected superior mother trees. These clones showed high growth and could produce more than 200 m3/ha in 20 years after planting. The silvicultural treatment could improve the growth of clonal teak through spacing arrangements and thinning. However, studies combining the effects of spacing and thinning to improve forest productivity in clonal teak plantations remain limited. Therefore, this study aims to determine the effect of different spacing and thinning intensity on the productivity of a 13-year-old clonal teak plantation. A nested randomized complete block design was used with 3 blocks as replication. The treatment comprised 4 spacing types: 3 m x 3 m, 6 m x 2 m, 8 m x 2 m, and 10 m x 2 m. Meanwhile, 3 thinning intensities were nested within each spacing treatment: 0% (control), 25% (medium thinning), and 50% (heavy thinning). The results showed that at the age of 13 years old, spacing treatment affected the development of diameter at breast height (DBH), mean annual diameter increment (MADI), tree bole height (TBH), crown diameter (CD), canopy openness (CO), competition index (CI), and pilodyn penetration (PP) (p < 0.05). Spacing treatment did not affect height (H), volume (Vol), and stress wave velocity (SWV) (p > 0.05). The best spacing to improve DBH, MADI, CD, CO, and PP was 10 m x 2 m, yielding 29.68 cm, 2.30 cm/year, 5.18 m, 54.84%, and 20.21 mm, respectively. Additionally, thinning intensity, nested within spacing treatment, significantly affected DBH, MADI, Vol, CO, and CI (p < 0.05). In conclusion, a combination of spacing 10 m x 2 m and thinning intensity 50% is recommended to increase forest productivity in a clonal teak plantation. Keywords: clonal teak, forest productivity, spacing, thinning intensity, wood properties  
Co-Authors Aditya Nur Cahyo Ari Susanti Aris Wibowo Denny Irawati Dian Novitasari Dwiko Budi Permadi Ganis Lukmandaru Greitta Kusuma Dewi Johanes Pramana Gentur Sutapa Joko Sulistyo Kaharuddin Kaharuddin Naoki Tani Ni Putu Diana Mahayani Nur Laily Anisa Ragil Widyorini Rika Bela Rahmawati Rini Pujiarti Sawitri Suryo Hardiwinoto Widiyatno Widiyatno Widiyatno Yusi Dian