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All Journal Jurnal Ilmu Kehutanan
Slamet Riyanto
Faculty of Forestry, Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry

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Analisis Usahatani Intensifikasi Agrosilvopastura Di Kalurahan Wiladeg, Kapanewon Karangmojo, Kabupaten Gunungkidul, Provinsi Daerah Istimewa Yogyakarta Muhammad Abdul Rahman Subrata; Slamet Riyanto; Wahyu Andayani; San Afri Awang; Greitta Kusuma Dewi
Jurnal Ilmu Kehutanan Vol 16 No 2 (2022): September
Publisher : Faculty of Forestry Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3550.808 KB) | DOI: 10.22146/jik.v16i2.1865

Abstract

This research aimed to analyze the increase in income from intensified agrosilvopastoral in Wiladeg Village, Karangmojo Sub-district, Gunungkidul Regency, Yogyakarta, Indonesia. This research employed Participatory Action Research (PAR) to collect data through four cycles of food crop production trials under forest stands. The on-farm trials used the submersible-well technology and lasted for three years. The Average Equivalent Value (AEV) analysis grouped the respondents into two strata based on land ownership. Stratum-1 consisted of respondents with an agrosilvopastoral area of ≤ 4000 m2, while stratum-2 of > 4000 m2. The off-farm intensification trials involved three cow fattening cycles and used Net Present Value (NPV) analysis. The results showed that on-farm trials contributed an increase in AEV, namely 692% on land strata-1 and 462% on land strata-2. The off-farm trials provided an NPV of IDR 14,679,000,00/year in the off-farm sector of cow fattening. Based on these results, intensified agrosilvopastoral was feasible to increase land productivity both on-farm and off-farm in Wiladeg Village.
Predicting Timber Demand for the Shipyard Industry in Batang, Central Java, Indonesia Using System Dynamics Modeling Deniska Adi Prasetyo; Djoko Soeprijadi; Slamet Riyanto
Jurnal Ilmu Kehutanan Vol 20 No 1 (2026): March
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jik.v20i1.22686

Abstract

Indonesia’s wooden shipbuilding industry faces pressure from rising fisheries targets and unstable timber supplies. Batang Regency, a prominent shipyard cluster in Indonesia, relies on tropical hardwoods such as bengkirai and merbau as the main raw material for shipbuilding. More fishing, under Maximum Sustainable Yield (MSY) and Total Allowable Catch (TAC) policies, will strain timber resources. This research developed a dynamic simulation model to estimate future timber demand for Batang’s wooden shipyards, using data from 21 shipyards and fisheries, timber, MSY, and TAC statistics (2014–2018). Implemented in Powersim Studio 10 and validated using the Mean Absolute Percentage Error (MAPE) by comparing simulated outputs with historical observations. The model estimated cumulative timber use of 52,035 m3 (an average of 10,407 m3/year) for 2014–2018. Projections show demand rising to 42,293 m3 by 2035 (0.93% of national output), with high accuracy (MAPE <5%). Integrating fisheries and timber data, the model supports sustainable planning for Indonesia’s wooden shipbuilding industry.
Co-Authors Deniska Adi Prasetyo Djoko Soeprijadi Greitta Kusuma Dewi Muhammad Abdul Rahman Subrata San Afri Awang Wahyu Andayani