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FORM FACTORS AND VOLUME MODELS FOR ESTIMATING TREE BOLE VOLUME OF MAHOGANY AT COMMUNITY FORESTS IN CENTRAL JAVA Tatang Tiryana; Lailatul Khasanah; Priyanto Priyanto; Sri Rahaju; Muhdin Muhdin
Indonesian Journal of Forestry Research Vol 8, No 2 (2021): Indonesian Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2021.8.2.199-211

Form factors and volume models are often be used in the estimation of tree volumes. However, a few studies have developed and evaluated the accuracy of form factors and volume models for estimating tree volumes of community forests. This study aimed to formulate form factors and volume models and assess their prediction accuracy for estimating tree bole volumes of mahogany at community forests in Central Java. This study used 120 sample trees with diameters of 6–38 cm to formulate artificial and absolute form factors and to develop tree bole volume models. These form factors coupled with bole height and total height were used in simple volume equations. Regression analyses were used to develop volume models using the diameter and total height as predictors. The simple volume equations and volume models' prediction accuracy was evaluated using a cross-validation dataset and independent dataset (30 sample trees). The artificial form factor (0.68 ± 0.11) of mahogany, which was higher than the absolute form factor (0.46 ± 0.09), provided accurate estimates of tree bole volumes when it was used with the bole height instead of the total height. The volume model that uses diameter and total height produced the most accurate estimates, while the volume model that uses diameter alone provided the most practical yet reliable tool for estimating tree bole volumes of mahogany. The results of this study are useful for improving community forest management.

PENENTUAN UKURAN PLOT CONTOH OPTIMAL UNTUK PENDUGAAN LUAS BIDANG DASAR DAN BIOMASSA TEGAKAN Erwin Kusumah Nanjaya; Teddy Rusolono; Tatang Tiryana
Jurnal Penelitian Hutan dan Konservasi Alam Vol 17, No 1 (2020): Jurnal Penelitian Hutan dan Konservasi Alam
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphka.2020.17.1.65-77

Luas bidang dasar dan biomassa tegakan hutan dapat dihitung dari data inventarisasi hutan yang diperoleh melalui pengukuran tegakan menggunakan plot-plot contoh dengan ukurandan jumlah tertentu. Tingkat akurasi data dan informasi yang diperoleh dari inventarisasi hutan akan sangat tergantung dari besarnya ukuran dan jumlah plot contoh tersebut. Sampai saat ini, masih sedikit studi yang mempelajari ukuran dan jumlah plot contoh untuk pelaksanaan inventarisasi hutan terutama hutan alam tropis di Indonesia. Penelitian ini bertujuan untuk menentukan ukuran dan jumlah plot contoh optimal untuk pendugaan luas bidang dasar dan biomassa tegakan dalam inventarisasi hutan pada empat jenis ekosistem hutan alam (Hutan Lahan Kering Primer/HLKP, Hutan Lahan Kering Sekunder /HLKS, Hutan Rawa Primer/HRP dan Hutan Rawa Sekunder/HRS). Data yang digunakan adalah data Petak Ukur Permanen (PUP) yang terdapat dalam klaster plot data Inventarisasi Hutan Nasional (National Forest Inventory/NFI) di Indonesia. Analisis data dilakukan untuk mendapatkan nilai koefisien variasi (CV) luas bidang dasar dan biomassa melalui simulasi berbagai ukuran plot contoh. CV menurun dengan meningkatnya ukuran plot, mengikuti tren eksponensial negatif. Ukuran plot optimal untuk HLKP, HLKS, dan HRS adalah 0,40 ha, sedangkan untuk HRP adalah 0,25 ha. Jumlah plot contoh optimal bervariasi sesuai dengan tipe ekosistem hutan dan tingkat kesalahan pengambilan sampel yang diinginkan. Studi ini menegaskan bahwa ukuran dan jumlah plot contoh harus disesuaikan pada setiap ekosistem hutan untuk memfasilitasi inventarisasi hutan yang efisien.

MODEL VOLUME POHON SENGON UNTUK MENILAI KEHILANGAN KEUNTUNGAN PETANI HUTAN RAKYAT Ari Ardelina; Tatang Tiryana; Muhdin Muhdin
Jurnal Penelitian Hutan Tanaman Vol 12, No 2 (2015): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

Sistem penjualan pohon sengon ( L.) di hutan rakyat tanpa menggunakan model volume Paraserianthes falcataria pohon yang tepat dapat menimbulkan kehilangan keuntungan petani. Tujuan penelitian ini adalah untuk memperoleh model volume sengon dan mengevaluasi praktek yang biasa dilakukan dalam penjualan kayu sengon di hutan rakyat. Hasil penelitian menunjukkan bahwa model volume yang dapat digunakan secara akurat untuk memperkirakan 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 penduga volume pohon sengon dengan akurat.

Allometric Models for Estimating Tree Biomass of Dryland Secondary Forest in East Halmahera Mujahidah Sylviari Zaenal; Tatang Tiryana; Muhdin Muhdin
Jurnal Wasian Vol 7, No 2 (2020): 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.v7i2.5948

Biomass estimation of secondary forests is required to support the emission reduction of carbon dioxide through an enhancement of forest carbon stocks. Commonly, forest biomass is indirectly estimated using tree biomass allometric models that are developed based on a destructive sampling of sample trees. The availability of biomass allometric models for secondary forests in Indonesia is still limited, particularly for secondary forest ecosystems in eastern Indonesia. This study aimed to develop allometric biomass models for mixed-species trees in a secondary forest of East Halmahera, North Maluku, and to compare their accuracies with some other allometric biomass models that commonly used for estimating biomass of secondary forests. The tree biomass measurement was conducted by using a destructive sampling of 18 mixed-species trees (with diameter range of 5,4 – 36,9 cm) in a secondary forest. The samples of each tree component (stem, branch, twig, and leaf) were analyzed in a laboratory to determine the biomass of each sample tree. Allometric models were developed by using a non-linear regression analysis, which were then compared with other allometric models. This study revealed that the biomass of mixed-species trees in the study area could be estimated accurately using the M7 model that used diameter, height, and wood density variables. Such local allometric model was more accurate than other allometric models commonly used for estimating tropical forest biomass. Alternatively, the M3 model that used diameter and height variables could also be used when wood density data was not available. The local allometric models from this study can enrich the availability of biomass allometric models for secondary forest ecosystems in eastern Indonesia. Keyword: allometric model, destructive sampling, mixed-species, REDD+, secondary forest

Litsea cubeba Essential Oil Yield Harvested from Different Habitat Types on Mt. Papandayan, West Java, Indonesia Ichsan Suwandhi; Cecep Kusmana; Ani Suryani; Tatang Tiryana
Journal of Mathematical and Fundamental Sciences Vol. 46 No. 3 (2014)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2014.46.3.5

The objective of this research was to determine the yield and chemical composition of Litsea cubeba essential oil harvested from different habitat types on Mount Papandayan, West Java, Indonesia. The methods used were determination of sample plots at each habitat, followed by laboratory testing. Leaf samples were taken from each plot, the oil was extracted in the laboratory using steam distillation, which was subsequently analyzed by GC-MS. The results showed that the yield of essential oil was high (2.76-9.33%). The three dominant chemical compounds found were eucalyptol (16.97-55.78%), Î±-terpinenyl acetate (7.27-20.44%), and sabinene (14.45-68.05%). The results confirmed the expectation that Litsea cubeba essential oils extracted from Litsea cubeba trees growing in various habitats on Mount Papandayan would show a variety in yield and chemical composition.

Allometric Models for Estimating Tree Biomass of Dryland Secondary Forest in East Halmahera Mujahidah Sylviari Zaenal; Tatang Tiryana; Muhdin Muhdin
Jurnal Wasian Vol 7, No 2 (2020): Jurnal Wasian
Publisher : Balai Penerapan Standar Instrumen Lingkungan Hidup dan Kehutanan (BPPLHK)Manado

Biomass estimation of secondary forests is required to support the emission reduction of carbon dioxide through an enhancement of forest carbon stocks. Commonly, forest biomass is indirectly estimated using tree biomass allometric models that are developed based on a destructive sampling of sample trees. The availability of biomass allometric models for secondary forests in Indonesia is still limited, particularly for secondary forest ecosystems in eastern Indonesia. This study aimed to develop allometric biomass models for mixed-species trees in a secondary forest of East Halmahera, North Maluku, and to compare their accuracies with some other allometric biomass models that commonly used for estimating biomass of secondary forests. The tree biomass measurement was conducted by using a destructive sampling of 18 mixed-species trees (with diameter range of 5,4 – 36,9 cm) in a secondary forest. The samples of each tree component (stem, branch, twig, and leaf) were analyzed in a laboratory to determine the biomass of each sample tree. Allometric models were developed by using a non-linear regression analysis, which were then compared with other allometric models. This study revealed that the biomass of mixed-species trees in the study area could be estimated accurately using the M7 model that used diameter, height, and wood density variables. Such local allometric model was more accurate than other allometric models commonly used for estimating tropical forest biomass. Alternatively, the M3 model that used diameter and height variables could also be used when wood density data was not available. The local allometric models from this study can enrich the availability of biomass allometric models for secondary forest ecosystems in eastern Indonesia. Keyword: allometric model, destructive sampling, mixed-species, REDD+, secondary forest

Assessing the Crown Closure of Nypa on UAV Images using Mean-Shift Segmentation Algorithm Robert Parulian Silalahi; I Nengah Surati Jaya; Tatang Tiryana; Fairus Mulia
Indonesian Journal of Electrical Engineering and Computer Science Vol 9, No 3: March 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v9.i3.pp722-730

Utilization of very high-resolution images becomes a new trend in forest management, particularly in the detection and identification of forest stand variables. This paper describes the use of mean-shift segmentation algorithm on unmanned aerial vehicles (UAV) images to measure crown closure of nypa (Nypa fructicans) and gap. The 27 combinations of the parameter values such as spatial radius (hs), range radius (hr), and minimum region size (M). Gap detection and nypa crown closure measurements were performed using a hybrid between pixel-based (maximum likelihood classifier) and object-based approaches (segmentation). For evaluation of the approach performance, the accuracy assessment was done by comparing object-based classification results (segmentation) and visual interpretation (ground check). The study found that the best combination of segmentation parameter was the combination of hs 10, hr 10 and M 50, with the overall accuracy of 76,6% and kappa accuracy of 55.7%.

POTENSI MINYAK ATSIRI DAUN ANDALIMAN (Zanthoxylum acanthopodium) SEBAGAI ANTIVIRUS CORONA BERDASARKAN PENAMBATAN MOLEKUL Endang Kintamani; Irmanida Batubara; Cecep Kusmana; Tatang Tiryana; Edi Mirmanto; Fikry Awaludin
BERITA BIOLOGI Vol 21, No 2 (2022): Berita Biologi
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v21i2.4350

Andaliman (Zanthoxylum acanthopodium) plant, a unique spice in the Batak tribe limited only to the fruit. The leaves available most of the time and consisting of essential oils, there are no research has been conducted on molecular docking to determine the potential of the drug. The Covid-19 pandemic is still ongoing, so information as Corona antivirus is needed. This study aims to find the differences of chemical components from Andaliman leaves essential oil, classify the varieties, and get potential components as Corona antivirals based on molecular docking. The Andaliman leaves were collected from North Tapanuli District, than isolated using water distillation and Gas chromatography-mass spectrometry (GC-MS). Data analysis using Principal Component Analysis (PCA) with the XL stat 2020. The results showed that three varieties of Andaliman, Siholpu, Siganjangpat, and Variety three are not grouped in one quadrant. There are 53 compounds were detected. The dominant chemical compounds in all varieties are D-Limonene (Siganjangpat: 87.7%, Siholpu: 50.4%, and Variety three: 42.6%). Each variety is characterized by specific compounds, Siholpu by caryophyllene and sabinene; Singanjangpat by D-Limonene; Variety three by neryl acetate and 1,8-cinneol. The chemical component in Andaliman leaves that most potent as Corona antiviral is beta-caryophyllene in the Siholpu variety.

FEASIBILITY ANALYSIS OF SUSTAINABLE CASSAVA FOOD ESTATE IN GUNUNGMAS REGENCY CENTRAL BORNEO PROVINCE Angga Nalindo Utama; Meti Ekayani; Tatang Tiryana
Jurnal Ekonomi Vol. 12 No. 01 (2023): Jurnal Ekonomi, 2023 Periode Januari - Maret
Publisher : SEAN Institute

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

The purpose of this study is to find the availability of land conformity for the development of cassava's food estate in Gunungmas regency. Gunungmas regency is one of the location targets for the development of food estates in Indonesia . The combination of multi criteria based on hierarchical analytical process analysis and geographic information system (GIS) to produce the map of land used availability and sustainable cassava's food estate land. The Principles that used to determine of food estate suitability are the sustainability criteria of economy, social and environmental . The data used was spatial data relating, and interviews with experts regarding the weight and value to determine the extent of the interest in the hierarchy analytical process. Weighting is done on each criterion based on its level of importance on land suitability. The value of all by virtue of conformity each sub criteria . The highest value represents an area that has a high level of suitability. The weighting overlay method was used to produce a land suitability map for a sustainable cassava food estate. The results of the study show that the available land for the development of a food estate in Gunungmas Regency is 33,799.15 Ha. Sustainable cassava food estate land suitability class is 31,496.21 Ha, very suitable 496.74 Ha, class is not suitable 1,806.21 Ha.

Mewujudkan Kelestarian Hasil Tegakan Merbau di Hutan Alam Indonesia Tiryana, Tatang; Rusolono , Teddy; Muhdin, Muhdin
Policy Brief Pertanian, Kelautan, dan Biosains Tropika Vol 4 No 3 (2022): Policy Brief Pertanian, Kelautan dan Biosains Tropika
Publisher : Direktorat Kajian Strategis dan Reputasi Akademik IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agro-maritim.0403.268-271

Untuk mewujudkan kelestarian hasil tegakan merbau diperlukan metode pengaturan hasil yang tepat. Namun sampai saat ini, pemerintah masih menggunakan metode pengaturan hasil yang bersifat umum untuk seluruh jenis tegakan, sehingga tidak cocok untuk tegakan merbau yang riapnya rendah dan populasinya jarang. Alternatifnya, pengaturan hasil tegakan merbau dapat menggunakan metode pengaturan hasil berbasis dinamika struktur tegakan. Metode tersebut dapat membantu pengelola hutan untuk menentukan jatah tebang tahunan dan merumuskan berbagai skenario pengaturan hasil sesuai dengan tujuan pengelolaan dan karakteristik tegakan merbau yang dikelolanya. Dalam implementasinya, metode tersebut dapat mendorong pengelola hutan untuk memperbaiki praktik praktik-praktik pengelolaan hutannya menjadi lebih baik.

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