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PERSAMAAN ALLOMETRIK JABON (Neolamarckia cadamba Miq) UNTUK PENDUGAAN BIOMASSA DI ATAS TANAH PADA HUTAN RAKYAT KECAMATAN PAKENJENG KABUPATEN GARUT Mohamad Siarudin; Yonky Indrajaya
Jurnal Penelitian Hutan Tanaman Vol 11, No 1 (2014): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Penelitian bertujuan untuk membuat persamaan allometrik jenis jabon (Neolamarckia cadamba Miq) untuk mengestimasi biomassadi atas tanah pada tegakan jabon. Sampel 23 pohon jabon dengan kisaran diameter 10,5–30,2 cm diambil dari hutan rakyat. Masing-masing pohon sampel diukur guna menentukan biomassa di atas tanah berdasarkan fraksi pohon (batang, cabang, daun). Selanjutnya data dianalisis dengan menggunakan regresi linier yang ditransformasikan ke dalam bentuk logaritma. Variabel bebas adalah dbh (diameter at breast height, cm) dan variable tidak bebas adalah biomassa pohon (kg). Hasil penelitian menunjukkan bahwa diameter setinggi dada dapat digunakan sebagai variabel tunggal dalam penyusunan model pendugaan biomassa jabon. Persamaan alometrik pendugaan biomassa di atas tanah untuk jenis jabon bagian batang, cabang, ranting, daun dan total adalah beruturut-turut Y = 0,010 (D)2,999 , Y = 0,001 (D) 3,082, Y = 0,011 (D) 2,135, dan Y = 0,014 (D) 2,958.

DAUR FINANSIAL HUTAN RAKYAT JABON DI KECAMATAN PAKENJENG, KABUPATEN GARUT, JAWA BARAT Yonky Indrajaya; Mohamad Siarudin
Jurnal Penelitian Hutan Tanaman Vol 10, No 4 (2013): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jpht.2013.10.4.201-211

Menentukan daur tebang merupakan langkah penting bagi pengelola hutan untuk mendapatkan keuntungan financial yang maksimal. Daur financial Faustman merupakan pendekatan yang telah banyak diterapkan khususnya untuk hutan tanaman. Penelitian ini bertujuan untuk menemukan daur Faustman pada tanaman jabon di hutan rakyat Kecamatan Pakenjeng, Garut, Jawa Barat. Metode yang digunakan adalah memaksimalkan keuntungan yang dapat diperoleh pada tiap daur. Pengumpulan data dilakukan dengan pengukuran pertumbuhan tegakan jabon meliputi tinggi dan diameter, serta wawancara dengan petani jabon untuk mendapatkan data mengenai biaya dan pendapatan dari tanaman jabon. Hasil penelitian menunjukkan bahwa daur financial Faustman pada tanaman jabon adalah 6 tahun. Daur ini lebih lama 1 tahun dibanding dengan daur biologisnya yaitu 5 tahun. Berdasarkan analisis sensitifitas diketahui bahwa daur Faustman akan lebih pendek jika terjadi peningkatan harga kayu, peningkatan suku bunga, dan penurunan produksi kayu. Sebaliknya, daur Faustman akan lebih panjang jika terjadi peningkatan biaya penanaman.

ANALISIS USAHA BUDIDAYA AGROFORESTRI AKOR DI KPHP BATULANTEH, SUMBAWA, NUSA TENGGARA BARAT Yonky Indrajaya; Mohamad Siarudin
Jurnal Wasian Vol 8, No 1 (2021): Jurnal Wasian
Publisher : Balai Penerapan Standar Instrumen Lingkungan Hidup dan Kehutanan (BPPLHK)Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jwas.v8i1.5573

The utilization of land together between trees and crops is one of the strategies in land rehabilitation program in Indonesia. High pressure from people living surrounding the forest land required the forest managers to invite more participation from the people in managing the forest land. Agroforestry pattern with certain tree species chosen by forest managers together with certain crops preferred by the communities may become the solution for all stakeholders’ interests in a high-pressured forest area. One of the considerations in agroforestry development is economic aspect. This study aims to analyze the financial feasibility of agroforestry pattern auri (Acacia auriculiformis) and peanut, pigeon pea, and corn in Batulanteh forest management unit (FMU) in Sumbawa, West Nusa Tenggara. The feasibility assessment criteria used in this study were Net Present Value (NPV), Internal Rate of Return (IRR) and Benefit Cost Ratio (BCR). The result of this study showed that agroforestry pattern of auri with paddy, peanut, pigeon pea and corn is financially feasible with the NPV, IRR and BCR values are IDR14.607.837.-, 53 % and 1.51 respectively. Keywords: agroforestry, paddy, peanut, pigeon pea, corn, dry land

The Study of Faustmann Formula Application in Sustainable Natural Forest Management in Indonesia Yonky Indrajaya
Jurnal Wasian Vol 5, No 1 (2018): Jurnal Wasian
Publisher : Balai Penerapan Standar Instrumen Lingkungan Hidup dan Kehutanan (BPPLHK)Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jwas.v5i1.4109

In the forest economics literature, Faustmann formula is highly adopted for profit maximization problem in forest management, mostly in plantation forest. Stylized models of Faustmann formula to be applied in selective logging regime have also been studied extensively in multi-age and multi-species forest. In general, natural forest managers in Indonesia have not adopted the Faustmann formula in their management decisions. Sustainability aspect in natural forest management is applied based on silvicultural consideration, i.e. measuring residual stand that is able to be harvested in the next cutting cycle. This study aims to analyze the application of Faustmann formula in the current selective logging regime in Indonesia (i.e. TPTI), so that the natural forest managers may gain maximum profit and sustainable. This study is a qualitative research based on literature review. The results of this study show that under deterministic growth model (i.e. matrix transition model) and robust damage model (i.e. transition matrix with different damage proportions on each species and diameter class), the Faustmann formula can be applied for selective Logging regime in Indonesia.Keywords: Faustmann formula, selective logging, natural forest, Indonesia

DAUR OPTIMAL TEGAKAN GMELINA PADA DUA PROYEK KARBON: MEMPERPANJANG DAUR DAN AFORESTASI Yonky Indrajaya; Satria Astana
Jurnal Penelitian Sosial dan Ekonomi Kehutanan Vol 13, No 3 (2016): Jurnal Penelitian Sosial dan Ekonomi Kehutanan
Publisher : Pusat Penelitian dan Pengembangan Sosial, Ekonomi, Kebijakan dan Perubahan Iklim

Forest plantation may contribute economically and socially as a provider of wood raw materials for industry and providing jobs for local people. In addition, forest plantation may also contribute as watershed protection and carbon sequestration. Projects on carbon sequestration from plantation forest can be conducted in two types: (1) afforestation and (2) lengthening forest rotation. One of the potential carbon markets operationalized in the field is voluntary market with Verified Carbon Standard mechanism. This study aimed to analyze the optimal rotations of gmelina forests on two carbon projects: lengthening rotation and afforestation. The method used in this study was by using Hartman model ( i.e. Faustmann) by maximizing profit with the revenue source from timber and carbon sequestrationproject. The results of this study showed that carbon price will affect the optimal rotation for lengthening forest rotation of VCS project. Meanwhile, for VCS afforestation project, carbon price had no effect on the optimal rotation on gmelina forest. The NPV value of afforestation project was relatively higher than that of NPV value of lengthening forest rotation project, since the amount of carbon that can be credited relatively higher in afforestation project.

ANALISIS USAHA BUDIDAYA PEPAYA POLA AGROFORESTRI JATI-PEPAYA DI DESA PURWAHARJA, BANJAR Yonky Indrajaya; Ary Widiyanto
Jurnal Agroforestri Indonesia Vol 2, No 1 (2019)
Publisher : Balai Litbang Teknologi Agroforestry, Ciamis

The utilization of land under tree stand in teak forest has been widely applied by Perhutani as a means to maintain the quality of teak tree and to give additional income to people living around the teak plantation. In general, the utilization of land under tree stand is by planting crops for limited duration. One of the crops planted under teak stands is papaya that is planted together with teak seedlings until 2 years. This study aims to analyze the feasibility of papaya cultivation under teak stands in Purwaharja Village, Banjar City. The analysis tools used include NPV (Net Present Value) and BCR (Benefit Cost Ratio). The results of this study show that the papaya cultivation under teak stands give NPV of IDR 20,072,606.- and BCR of 2.89. Therefore, the cultivation of papaya under teak stand is feasible to conduct.

KARBON TERSIMPAN DALAM PRODUK KAYU SENGON MENGGUNAKAN BEBERAPA MODEL OKSIDASI Yonky Indrajaya
Jurnal Agroforestri Indonesia Vol 2, No 2 (2019)
Publisher : Balai Litbang Teknologi Agroforestry, Ciamis

Harvested wood product is one of the carbon pools that must be considered in calculating carbon emission from forestry sector. There are several models of wood product retirement : linear, logistic, and exponential. The type of model applied inthe calculation of wood product pool influence the estimated amount of carbon stored in wood product, and hence also influence the recommended management regime of a plantation forest. This study analyzed how different models of wood product oxidation produced different estimates of carbon stored in sengon wood product and caused different management recommendation of sengon plantation. The models used in this paper include linear (VCS model), exponential (IPCC, 2006), and logistic (Miner model). The focus of the study is to evaluate only long term wood product that is oxidized up to 100 years. The study showed that the lowest carbon stored from sengon wood product are those estimated by linear, logistic, and exponential respectively. VCS model with 20 years linear decay is conservative.

ANALISIS USAHA BUDIDAYA AGROFORESTRI AKOR DI KPHP BATULANTEH, SUMBAWA, NUSA TENGGARA BARAT Yonky Indrajaya; Mohamad Siarudin
Jurnal Wasian Vol 8, No 1 (2021): Jurnal Wasian
Publisher : Balai Penerapan Standar Instrumen Lingkungan Hidup dan Kehutanan (BPPLHK)Manado

The utilization of land together between trees and crops is one of the strategies in land rehabilitation program in Indonesia. High pressure from people living surrounding the forest land required the forest managers to invite more participation from the people in managing the forest land. Agroforestry pattern with certain tree species chosen by forest managers together with certain crops preferred by the communities may become the solution for all stakeholders’ interests in a high-pressured forest area. One of the considerations in agroforestry development is economic aspect. This study aims to analyze the financial feasibility of agroforestry pattern auri (Acacia auriculiformis) and peanut, pigeon pea, and corn in Batulanteh forest management unit (FMU) in Sumbawa, West Nusa Tenggara. The feasibility assessment criteria used in this study were Net Present Value (NPV), Internal Rate of Return (IRR) and Benefit Cost Ratio (BCR). The result of this study showed that agroforestry pattern of auri with paddy, peanut, pigeon pea and corn is financially feasible with the NPV, IRR and BCR values are IDR14.607.837.-, 53 % and 1.51 respectively. Keywords: agroforestry, paddy, peanut, pigeon pea, corn, dry land

The Study of Faustmann Formula Application in Sustainable Natural Forest Management in Indonesia Yonky Indrajaya
Jurnal Wasian Vol 5, No 1 (2018): Jurnal Wasian
Publisher : Balai Penerapan Standar Instrumen Lingkungan Hidup dan Kehutanan (BPPLHK)Manado

In the forest economics literature, Faustmann formula is highly adopted for profit maximization problem in forest management, mostly in plantation forest. Stylized models of Faustmann formula to be applied in selective logging regime have also been studied extensively in multi-age and multi-species forest. In general, natural forest managers in Indonesia have not adopted the Faustmann formula in their management decisions. Sustainability aspect in natural forest management is applied based on silvicultural consideration, i.e. measuring residual stand that is able to be harvested in the next cutting cycle. This study aims to analyze the application of Faustmann formula in the current selective logging regime in Indonesia (i.e. TPTI), so that the natural forest managers may gain maximum profit and sustainable. This study is a qualitative research based on literature review. The results of this study show that under deterministic growth model (i.e. matrix transition model) and robust damage model (i.e. transition matrix with different damage proportions on each species and diameter class), the Faustmann formula can be applied for selective Logging regime in Indonesia.Keywords: Faustmann formula, selective logging, natural forest, Indonesia

Daur Optimal Hutan Tanaman Sengon Dalam Proyek Aforestasi: Review Hasil Penelitian Suharlan 1975 Yonky Indrajaya
Jurnal Penelitian Kehutanan Wallacea Vol. 6 No. 2 (2017)
Publisher : Foresty Faculty of Hasanuddin University

Forests play an important role in climate change mitigation by absorbing carbon dioxide in the atmosphere. Additional revenue from carbon credits may change the optimal management of plantation forest. This research aims to analyze the optimal rotation of joint production of timber and carbon sequestration of sengon stand in Java. The method used in this research is the profit maximization of forest stand obtained from wood sales and carbon credits (i.e. Hartman rule as a modification of Faustmann rule). The results of this study showed that (1) the biological rotation of sengon forest in site quality (SQ) III and IV are 6 and 5 years respectively, (2) Financial rotations of sengon forest in SQ III and IV are 8 and 6 years respectively, and (3) Additonal income from carbon sales in afforestation project will not lengthen the optimal rotation of sengon plantation.

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