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All Journal Indonesian Journal of Forestry Research JURNAL ANALISIS KEBIJAKAN KEHUTANAN Indonesian Journal of Forestry Research
Sandhi Imam Maulana
Forestry Research Institute at Manokwari-Forestry Research and Development Agency Jl. Inamberi, Susweni PO BOX 159, Manokwari 98313-Papua Barat
Agriculture, Biological Sciences & Forestry

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PROSPEK PEMBANGUNAN HUTAN TANAMAN RAKYAT DI KABUPATEN BIAK NUNFOR, PAPUA Yeny, Irma; Maulana, Sandhi Imam
ISSN 0216-0897
Publisher : Pusat Penelitian dan Pengembangan Perubahan Iklim dan Kebijakan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pembangunan hutan tanaman oleh rakyat diharapkan secara bertahap akan mengubah lahan kritis menjadi produktif dan meningkatkan kesejahteraan masyarakat. Salah satu faktor yang menyebabkan lambannya pembangunan hutan tanaman rakyat adalah kurangnya minat masyarakat. Untuk mendukung minat masyarakat dan pengusaha lokal dalam mengembangkan hutan tanaman rakyat dibutuhkan beberapa hal yaitu : sosialisasi program ditingkat masyarakat sehingga tepat sasaran, kepastian hukum atas status lahan, informasi kelayakan usaha baik secara teknis maupun finansialnya, dan pendampingan kelembagaan masyarakat. Penelitian ini bertujuan memberikan informasi prospek hutan tanaman rakyat yang dapat dikembangkan di Kabupaten Biak Nunfor termasuk manfaat ekonomis yang diterima dengan keberadaan hutan tanaman rakyat tersebut. Penelitian dilakukan dengan menggunakan metode Desktiptif Kwantitatif dengan teknik survey. Prospek pengembangan hutan rakyat dihitung dengan melihat aspek finansial dan kontribusi kegiatan HTR pada pendapatan petani. Perhitungan aspek finansial dilakukan dengan mengambil contoh pada hutan rakyat KTH Insumarires Distrik Biak Timur yaitu pendapatan bersih pengusahaan hutan dengan menggunakan rumus Faustman, kelayakan finansial dihitung kriteria Net Present Value (NPV), Benefit Cost Ratio (BCR) dan Internal Rate of Return (IRR) yang dinyatakan dalam satuan persen. Hasil penelitian menunjukkan 1) jika 10% dari hutan produksi di Kabupaten Biak Nunfor merupakan hutan produksi yang tidak produktif maka diperkirakan terdapat 7.477,8 ha yang dapat dimanfaatkan sebagai areal hutan tanaman rakyat dengan jenis unggulan Calophyllum inophyllum dengan menggunakan sistem silvikultur THPB. 2) Pengusahaan HTR layak dilaksanakan dalam daur 50 tahun dengan discount rate 5%. 3) Tingginya curahan hari kerja (5.724 HOK) memberikan dampak pada perluasan lapangan kerja dan tingkat pendapatan petani dari kegiatan tersebut. 4) Kontribusi pendapatan petani terbesar berasal dari nilai biodiesel dari biji Calophyllum inophyllum yang mencapai yang mencapai 68% dari total pendapatan. Perkiraan pendapatan bersih pengusahaan HTR yang dapat diterima pada akhir daur pengelolaan (50 tahun) oleh masing-masing anggota kelompok (1 kelompok 159 orang), dengan luas ideal pengusahaan ideal 1717.2 ha mencapai Rp. 724.008.070;90. Kondisi ini diharapkan mampu meningkatkan surplus di sektor kehutanan yang pada akhirnya meningkatkan pertumbuhan PDRB dan peningkatan sarana prasarana pendukung bagi pembangunan wilayah.
ALLOMETRIC EQUATIONS FOR ESTIMATING ABOVEGROUND BIOMASS IN PAPUA TROPICAL FOREST Maulana, Sandhi Imam
Indonesian Journal of Forestry Research Vol 1, No 2 (2014): Indonesian Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (120.264 KB) | DOI: 10.20886/ijfr.2014.1.2.77-88

Abstract

Allometric equations can be used to estimate the biomass and carbon stock of forest. However, so far the allometric equations for commercial species in Papua tropical forest have not been appropriately developed. In this research, allometric equations are presented based on the genera of commercial species. Few equations are developed for the Intsia, Pometia, Palaquium and Vatica genera, and an equation of a mix of these genera represents commercial species. The number of trees sampled in this research was 49, with diameters (1.30 m or above buttresses) ranging from 5 to 40 cm. Destructive sampling was used to collect the samples where diameter at breast height (DBH) and wood density (WD) were used as predictors for dry weight of total above-ground biomass (TAGB). Model comparison and selection were based on the values of F-statistics, R-sq, R-sq (adj), and average deviation. Based on these statistical indicators, the most suitable model is Log(TAGB) = c + aLog(DBH). This research finding can be extrapolated for managing forests related to carbon balance. Additional explanatory variables such as commercial bole height (CBH) do not really increase the indicators’ goodness of fit for the equation. An alternative model to incorporate wood density must be considered for estimating the aboveground biomass for mixed genera.  Comparing the presented equations to previously published data shows that these local species-specific and generic equations differ substantially from previously published equations and that site-specific equations must be considered to get a better estimation of biomass.
ALLOMETRIC EQUATIONS FOR ESTIMATING ABOVEGROUND BIOMASS IN PAPUA TROPICAL FOREST Maulana, Sandhi Imam
Indonesian Journal of Forestry Research Vol. 1 No. 2 (2014): 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.2014.1.2.77-88

Abstract

Allometric equations can be used to estimate biomass and carbon stock of the forest. However, so far the allometric equations for commercial species in Papua tropical forests have not been appropriately developed. In this research, allometric equations are presented based on the genera of commercial species. Few equations have been developed for the commercial species of Intsia, Pometia, Palaquium and Vatica genera and an equation of a mix of these genera. The number of trees sampled in this research was 49, with diameters (1.30 m above-ground or above buttresses) ranging from 5 to 40 cm. Destructive sampling was used to collect the samples where Diameter at Breast Height (DBH) and Wood Density (WD) were used as predictors for dry weight of Total Above-Ground Biomass (TAGB). Model comparison and selection were based on the values of F-statistics, R-sq, R-sq (adj), and average deviation. Based on these statistical indicators, the most suitable model for Intsia, Pometia, Palaquium and Vatica genera respectively are Log(TAGB) = -0.76 + 2.51Log(DBH), Log(TAGB) = -0.84 + 2.57Log(DBH), Log(TAGB) = -1.52 + 2.96Log(DBH), and Log(TAGB) = -0.09 + 2.08Log(DBH). Additional explanatory variables such as Commercial Bole Height (CBH) do not really increase the indicators’ goodness of fit for the equation. An alternative model to incorporate wood density should be considered for estimating the above-ground biomass for mixed genera.
DYNAMIC PROJECTION OF CLIMATE CHANGE SCENARIOS ON TROPICAL TREES' ABOVEGROUND CARBON STORAGE IN WEST PAPUA Maulana, Sandhi Imam; Wibisono, Yohannes
Indonesian Journal of Forestry Research Vol. 4 No. 2 (2017): 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.2017.4.2.107-120

Abstract

Through photosynthetic activities, tropical forest ecosystems capture and store the most significant carbon emissions in the form of biomass compared with other types of vegetation, and thus play a highly crucial part in dealing with climate change. However, such important role of tropical forest is very fragile from extreme changes in temperature and precipitation, because carbon storage in forest landscape is strongly related to those climate variables. This paper examines the impacts of future climate disturbances on aboveground carbon storage of three tropical tree species, namely Myristica sp., Palaquium sp., and Syzygium sp. through “what if ” scenarios evaluation using Structural Thinking and Experimental Learning Laboratory with Animation (STELLA). Results highlighted that when the dynamic simulation was running with five IPCC’s climate change scenarios (Constant year 2000 concentrations, B1, A1T, A2, and A1F1) for 200 years simulation period, then moderate climate change scenarios occured, such as B1 and A1T, would have already caused significant statistical deviation to all of those tree species. At the worst level of A1F1, the 4°C temperature was coupled with 20% reduction in precipitation. Palaquium sp. showed the highest reduction of aboveground carbon storage with about 17.216% below its normal value. This finding implies the negative climate feedbacks should be considered seriously to ensure the accuracy of long term forest carbon accounting under future climate uncertainty.
Co-Authors Irma Yeny Yohannes Wibisono