Ari Ardelina Tatang Tiryana Muhdin, Ari Ardelina Tatang Tiryana
Department Of Forest Management, Faculty Of Forestry, Bogor Agricultural University, Academic Ring Road, Campus IPB Dramaga, PO Box 168, Bogor 16680, Indonesia

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Simulating Harvest Schedule for Timber Management and Multipurpose Management in Teak Plantations Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 22 No. 1 (2016)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.84 KB) | DOI: 10.7226/jtfm.22.1.1

Abstract

Sustainable management of teak plantations in Java requires an improvement of the existing yield regulation method to optimize multiple benefits of the plantations at risk of stand destruction. This study was therefore aimed to formulate an alternative harvest scheduling model that integrates risk of stand destruction for supporting multipurpose management of teak plantations. The proposed model used a state-space planning model to simulate the dynamic of plantations due to timber harvesting and stand destruction, and then sought optimal solutions for two management scenarios, i.e. timber management that optimized total harvest volume and multipurpose management that optimized net present value (NPV) while increasing carbon stocks. Using a case study on a typical teak plantation, this study confirmed that increasing destruction rates reduced harvest volumes, NPV, carbon stocks, and resulted in imbalanced ending age-class structures. Reducing cutting-age limit increased harvest volumes and NPV, but it also reduced carbon stocks of the plantations. Although the multipurpose management generated lower financial benefit, it maintained carbon stocks and produced better ending age-class structures compared to timber management. The proposed harvest scheduling model provides a useful planning tool for managing teak plantations.
MODEL VOLUME POHON SENGON UNTUK MENILAI KEHILANGAN KEUNTUNGAN PETANI HUTAN RAKYAT Muhdin, Ari Ardelina Tatang Tiryana
Jurnal Penelitian Hutan Tanaman Vol 12, No 2 (2015): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

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Abstract

ABSTRACTSelling system of sengon (Paraserianthes falcataria ) timber in community forests without using appropriate tree L.volume models may generate profit loss for the farmers. The objectives of this study were to develop volume models ofsengon and to evaluate the profit losses of commonly practiced techniques for selling the sengon timber incommunity forest. The result showed that the proposed volume model can be used accurately to estimate the volumeof sengon trees in the community forest by measuring tree diameters. This study confirmed that the selling systembased on per log and total stand area caused profit losses of 24.99% and 32.19% respectively, to the farmers. Toavoid such disadvantages, therefore the use of the proposed volume model is recommended to facilitate accurateestimation of the volume of sengon trees.ABSTRAKSistem penjualan pohon sengon ( L.) di hutan rakyat tanpa menggunakan model volume Paraserianthes falcatariapohon yang tepat dapat menimbulkan kehilangan keuntungan petani. Tujuan penelitian ini adalah untukmemperoleh model volume sengon dan mengevaluasi praktek yang biasa dilakukan dalam penjualan kayu sengon dihutan rakyat. Hasil penelitian menunjukkan bahwa model volume yang dapat digunakan secara akurat untukmemperkirakan volume pohon sengon di hutan rakyat dapat diduga dengan hanya mengukur diameter pohon.Sistem penjualan berdasarkan batangan dan luasan menyebabkan petani kehilangan keuntungan sebesar 24,99%dan 32,19%. Untuk menghindari kelemahan tersebut maka direkomendasikan model volume sebagai pendugavolume pohon sengon dengan akurat.
Spatial Model of Deforestation in Sumatra Islands Using Typological Approach Nurdin Sulistiyono; I Nengah Surati Jaya; Lilik Budi Prasetyo; Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 21 No. 3 (2015)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1117.496 KB) | DOI: 10.7226/jtfm.21.3.99

Abstract

High rate of deforestation occurred in Sumatra Islands had been allegedly triggered by various factors. This study examined how the deforestation pattern was related to the typology of the area, as well as how the deforestation is being affected by many factors such as physical, biological, and socio-economic of the local community. The objective of this study was to formulate a spatial model of deforestation based on triggering factors within each typology in Sumatra Islands.  The typology classes were developed on the basis of socio-economic factors using the standardized-euclidean distance measure and the memberships of each cluster was determined using the furthest neighbor method. The logistic regression method was used for modeling and estimating the spatial distribution of deforestation. Two deforestation typologies were distinguished in this study, namely typology 1 (regencies/cities with low deforestation rate) and typology 2 (regencies/cities with high deforestation rate). The study found that growth rate of farm households could be used to assign each regencies or cities in Sumatra Islands into their corresponding typology. The resulted spatial model of deforestation from logistic regression analysis were logit (deforestation) = 1.355 + (0.012*total of farm households) – (0.08*elevation) – (0.019*distance from road) for typology 1 and logit (deforestation) = 1.714 + (0.007*total of farm households) – (0.021*slope) – (0.051*elevation) – (0.038* distance from road) + (0.039* distance from river) for typology 2, respectively. The accuracy test of deforestation model in 2000–2006 showed overall accuracy of  68.52% (typology 1) and 74.49% (typology 2), while model of deforestation in 2006–2012 showed overall accuracy of 65.37% (typology 1) and 72.24% (typology 2), respectively.
Predicting Spatial Distribution of Stand Volume Using Geostatistics Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 11 No. 2 (2005)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

Pendugaan volume tegakan hutan alam biasanya dilakukan dengan metode penarikan contoh (sampling) non-spasial. Dalam penelitian ini, dikembangkan metode pendugaan spasial dengan pendekatan geostatistika yang diterapkan untuk menduga dan memetakan sebaran volume tegakan di areal HPH Labanan, Kalimantan Timur. Pendugaan dilakukan dengan menggunakan metode kriging berdasarkan model spherical variogram dan data dari 1090 plot contoh. Keakuratan hasil pendugaan diuji melalui validasi dengan menggunakan 272 plot contoh yang berbeda. Hasil analisis menunjukkan bahwa volume tegakan memiliki korelasi spasial dengan keragaman yang cukup besar, namun tidak dijumpai adanya kecenderungan arah sebarannya. Selain itu, dapat dibuktikan bahwa pendugaan dengan metode kriging dapat memberikan nilai dugaan volume tegakan dengan akurasi yang cukup tinggi. Hal ini menunjukkan bahwa pendekatan geostatistika dapat digunakan sebagai metode alternatif dalam pendugaan dan pemetaan sebaran volume tegakan.
Spatial Metrics of Deforestation in Kampar and Indragiri Hulu, Riau Province Syamsu Rijal; Muhammad Buce Saleh; I Nengah Surati Jaya; Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 22 No. 1 (2016)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (812.336 KB) | DOI: 10.7226/jtfm.22.1.24

Abstract

The Riau Province has been suffering from the highest deforestation rate in Sumatra, Indonesia. Many and various factors haved been discussed as causes of different deforestation types. This research is focused on evaluating the spatial pattern of deforestation in a specific location respresenting a typical deforestation in Riau. The main objective of this study was to identify spatial metrics to describe deforestation that occurred in Kampar and Indragiri Hulu regencies.The study divided the deforestation process into 3 periods of observation, e.g., 1990–2000, 2000–2010, and 2010–2014. The study based on Landsat satellite imagery aquired in 1990, 2000, 2010, and 2014 as the main data sources.  The deforestation  was detected using post-classification comparison (PCC) on the basis of 11 land cover classes developed prior to any further change detection.  The deforestation was initially derived from reclassifying the original classes into only forest and non-forest classes, and then followed by spatial pattern analysis using Fragstat software. The study shows that 2 spatial pattern of deforestation in Kampar distinctly differs from those occurred in Indragiri Hulu Regency, particularly for the period of 1990–2014. The spatial pattern of deforestation in Kampar Regency were clumped, low contiguous between patch, and high fragmentated. Meanwhile, the spatial pattern in Indragiri Hulu Regency were clumped, high contiguous between patch, and low fragmentated. Profile of deforestation in Kampar Regency was cathegorized into early deforestation and Indragiri Hulu Regency as lately deforestation.
Analisa Keseimbangan Pasar dan Reposisi Strategi Pemasaran Kayu Lapis Dodik Ridho Nurrochmat; Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 6 No. 2 (2000)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

The economic crisis’ turbulence blows down almost all of Indonesian export commodity, included plywood. Dissolution of JMB-Apkindo (Joint Marketing Body-Association of Indonesian wood based panel) as an implementation of Letter of Intent between Indonesian Government and International Monetary Fund caused reposition of the Indonesian plywood marketing. Impacts of the dissolution of JMB are weakening of the bargaining position of Indonesian plywood market and pushing down the international price of Indonesian plywood. The large scale of illegal logging that follows reformation’s euphoria is another problem which influences supply-demand of timber products. A right strategy in the forestry sector policy especially in plywood marketing is needed to overcome the above problems.
Implications of the Private Property Right to the Community Forest Businesses Formalization through the Certification Policy Bramasto Nugroho; Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 19 No. 3 (2013)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (543.518 KB) | DOI: 10.7226/jtfm.19.3.178

Abstract

This study aimed to analyze the implication of formalization of community forest business efforts through mandatory timber legality certification policy. Field survey was conducted in March–April 2012 in 3 districts in Central of Java namely Blora, Wonogiri, and Wonosobo District. The results showed that community forest is mainly planting in their private owned land. It brings 2 consequences. Firstly, their willingness to manage their forest sustainably was emerged without any enforcement from external parties. Secondly, there were autonomous in decision making in their way to manage their forest such as they only planted tree species that easy to sell and valuable, they only cut their trees when they need huge money for children schooling, marriage, illness, and housing. The autonomous decision making gives also the owners (farmers) other alternatives to utilize their land otherwise planting the trees. It is mean, if the policy is decreasing the potential benefits from growing the trees, they can also convert their community forest into other business in which profitable and easy to sell their products. From those facts, it seems the formalization of community forest business through mandatory certification is not a proper policy to enhance the community forest.
Spatial Model of Deforestation in Jambi Province for The Periode 1990–2011 Putu Ananta Wijaya; Muhammad Buce Saleh; Tatang Tiryana
Jurnal Manajemen Hutan Tropika Vol. 21 No. 3 (2015)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

In the last 2 decades, deforestation had been an international issue due to its effect to climate change. This study describes a spatial modelling for predicting deforestation in Jambi Province. The main study objective was to find out the best spatial model for predicting deforestation by considering the spatial contexts. The main data used for the analysis were multitemporal Landsat TM images acquired in 1990, 2000, and 2011, the existing land cover maps published by the Ministry of Forestry, statistical data and ground truth.  Prior to any other analyses, all districts within the study area were classified into 2 typologies,  i.e., low-rate and high-rate deforestation districs on the basis of social and economic factors by using clustering approaches.  The spatial models of deforestation were developed by using least-square methods. The study found that the spatial model of deforestation for low-rate deforestation area  is Logit (Deforestation) = -2.7046 – 0.000397*JH90(distance from forest edge) + 0.000002*JJ(distance from road) – 0.000111*JKBN90 (distance from estate crop edge) + 0.000096 *JP90(distance from agricultural crop edge) + 0.044227*PDK90(population density) + 0.148187 *E(elevation) – 0.131178*S(slope); while for the high-speed deforestation area is Logit (Deforestation) = 9.1727 – 0.000788*JH90(distance from forest edge) – 0.000065 *JJ(distance from road) – 0.000091*JKBN90(distance from estate crop edge) + 0.000005 *JP90(distance from agricultural crop edge) – 0.070372*PDK90(population density) + 11.268539*E(elevation) – 1.495198*S(slope). The low-rate and high-rate deforestation models had relatively good ROC (Relative Operating Characteristics) values of 91.32% and 99.08%, respectively. The study concludes that the deforestation rate was significantly affected by accessibility (distance from forest edge, distance from estate crop edge, edge from agricultural land), biophysical condition (elevation and slope) as well as population density.