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All Journal Indonesian Journal of Forestry Research Jurnal Penelitian Hutan dan Konservasi Alam Jurnal Penelitian Hutan Tanaman Jurnal Penelitian Kehutanan Sumatrana J-Eltrik Indonesian Journal of Forestry Research
Agus Sumadi
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Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering

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Journal : Indonesian Journal of Forestry Research

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SITE INDEX PREDICTION OF SMALLHOLDER PLANTATIONS OF KAYU BAWANG (Disoxylum mollissimum Blume) IN BENGKULU PROVINCE Siahaan, Hengki; Sumadi, Agus
Indonesian Journal of Forestry Research Vol. 2 No. 2 (2015): 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.2015.2.2.81-92

Abstract

Kayu bawang (Dysoxylum mollissimum Blume) has been planted almost in all districts of Bengkulu Province, Indonesia, but yet no study has been conducted to analyze the site quality of this species. This paper studies the site quality of Dysoxylum mollissimum Blume of smallholder plantations by establishing 32 permanent sample plots (PSPs) distributed in six districts of Bengkulu Province and measured periodically from 2006 to 2012. Site quality was determined by phytocentric method which used stand dominant height as a indicator. The result shows that the best model for dominant height growth of Dysoxylum mollissimum Blume in Bengkulu Province was the Schumacher model expressed by the equation: Ln Ho = (3.06 + ai) – 2.05/A (R2 = 96.5%, Absolute Mean Residual (AMRES) = 0.82 and Average Percentage Difference (APD) =5.03%). The relevant site equation for this species derived from the dominant height growth model was: Ln Si = Ln H0 – 2.05 (1/12-1/A) for an index age of 12 years. Based on this equation, the sites were classified into 5 classes having an equal range of 3 m i.e. SI < 16 m; 16 m = SI < 19 m; 19 m = SI < 22 m; 22 m = SI < 25 m; and SI = 25 m: for site classes I, II, III, IV, and V representing from the lowest to the highest productivity respectively.
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 Efendi Agus Waluyo, Efendi Agus ENDANG SUHENDANG Haasler, Berthold Hengki Siahaan Jamaaluddin Purwanto Purwanto Rasjid Saputra, Dwi Hadidjaja Sri Utami Sumantri, Hendy Tatang Tiryana Teddy Rusolono