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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management Indonesian Journal of Forestry Research Jurnal Penelitian Hutan dan Konservasi Alam Jurnal Penelitian Hutan Tanaman Journal of Mathematical and Fundamental Sciences Jurnal Wasian BERITA BIOLOGI Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Biologi Tropis Indonesian Journal of Electrical Engineering and Computer Science Jurnal Risalah Kebijakan Pertanian dan Lingkungan Jurnal Ekonomi Jurnal Wasian Jurnal Sylva Lestari Policy Brief Pertanian, Kelautan, dan Biosains Tropika Indonesian Journal of Forestry Research
Tatang Tiryana
Department Of Forest Management, Faculty Of Forestry, Bogor Agricultural University, Academic Ring Road, Campus IPB Dramaga, PO Box 168, Bogor, Indonesia 16680
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Journal : Indonesian Journal of Forestry Research

 1 
FORM FACTORS AND VOLUME MODELS FOR ESTIMATING TREE BOLE VOLUME OF MAHOGANY AT COMMUNITY FORESTS IN CENTRAL JAVA Tiryana, Tatang; Khasanah, Lailatul; Priyanto, Priyanto; Rahaju, Sri
Indonesian Journal of Forestry Research Vol. 8 No. 2 (2021): 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.2021.8.2.199-211

Abstract

Form factors and volume models are often be used in the estimation of tree volumes. However, a few studies have developed and evaluated the accuracy of form factors and volume models for estimating tree volumes of community forests. This study aimed to formulate form factors and volume models and assess their prediction accuracy for estimating tree bole volumes of mahogany at community forests in Central Java. This study used 120 sample trees with diameters of 6–38 cm to formulate artificial and absolute form factors and to develop tree bole volume models. These form factors coupled with bole height and total height were used in simple volume equations. Regression analyses were used to develop volume models using the diameter and total height as predictors. The simple volume equations and volume models' prediction accuracy was evaluated using a cross-validation dataset and independent dataset (30 sample trees). The artificial form factor (0.68 ± 0.11) of mahogany, which was higher than the absolute form factor (0.46 ± 0.09), provided accurate estimates of tree bole volumes when it was used with the bole height instead of the total height. The volume model that uses diameter and total height produced the most accurate estimates, while the volume model that uses diameter alone provided the most practical yet reliable tool for estimating tree bole volumes of mahogany. The results of this study are useful for improving community forest management.
CARBON LOSS AFFECTED BY FIRES ON VARIOUS FORESTS AND LAND TYPES IN SOUTH SUMATERA Siahaan, Hengki; Kunarso, Adi; Sumadi, Agus; Purwanto, Purwanto; Rusolono, Teddy; Tiryana, Tatang; Sumantri, Hendy; Haasler, Berthold
Indonesian Journal of Forestry Research Vol. 7 No. 1 (2020): 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.2020.7.1.15-25

Abstract

Forest and land fires are a high source of emissions in South Sumatera. In line with the national policy, South Sumatera Province commits in reducing emission, include emission from the forest and land fire. This research was aimed to assess carbon loss affected by fire in the year of 2015 that covered 3 districts in South Sumatera i.e Musi Banyuasin, Banyuasin, and Musi Rawas. The research was conducted by remeasurement of carbon stocks plots on 4 forests and land type i.e. secondary peat swamp forest, secondary dryland forest, bushes swamp, and forest plantation. Carbon stocks measuring are conducted on sample plots in a rectangular shape of 20 m x 50 m of size for various types of natural forest and a circle shape in the radius of 11.29 cm and 7.98 cm respectively for forest plantation of < 4 years and > 4 years old. Furthermore, carbon stocks in each plot are measured for 3 carbon pools of above-ground biomass, deadwood and litter. The result shows that carbon loss was varying on each forest and land type. The largest number of carbon loss occur on secondary peat swamp forest of 94.2 t/ha that equivalent to the emission of 345.4 t CO2eq. The second largest of carbon loss occur on secondary dryland forest of 36.3 t/ha following by forest plantation and bushes swamp of 18.5 t/ha and 13.5 t/ha.
Co-Authors Adi Kunarso Adi Kunarso, Adi Agus Sumadi Agus Sumadi Angga Nalindo Utama Ani Suryani Ari Ardelina Berthold Haasler Bramasto Nugroho Budi Kuncahyo Cecep Kusmana Dodik Ridho Nurrochmat Dudung Darusman Edi Mirmanto Endang Kintamani Erwin Kusumah Nanjaya Fairus Mulia Faridh Almuhayat Uhib Hamdani Fikry Awaludin Haasler, Berthold Hardjanto Hendy Sumantri Hengki Siahaan Hengki Siahaan I Nengah Surati Jaya Ichsan Suwandhi Irmanida Batubara Khasanah, Lailatul Lailatul Khasanah LILIK BUDIPRASETYO Meti Ekayani Muhammad Buce Saleh Muhammad Resta Destyana Muhdin Muhdin Muhdin Muhdin Muhdin Muhdin, Muhdin Mujahidah Sylviari Zaenal Nining Puspaningsih Nurdin Sulistiyono Priyanto Priyanto Priyanto Purwanto Purwanto Purwanto Purwanto Putu Ananta Wijaya Rahaju, Sri Robert Parulian Silalahi Sri Rahaju Sumantri, Hendy Syamsu Rijal Teddy Rusolono Tikaputra, Firman Zulkarnain