RIAP DAN DUGAAN VOLUME TEGAKAN AMPUPU (S.T. Blake) DI KAWASAN HUTAN Eucalyptus urophylla WOLOLOBO, BAJAWA FLORES

Susila, Ida; Darwo, Darwo

doi:10.20886/jpht.2015.12.2.105-113

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…As observed, the annual diameter increment decreases if CAI is less than MAI. At 20 and 21 years old, this increment is expected almost identically to the stands of Eucalyptus urophylla in Bajawa Flores (Susila & Darwo, 2015). The diameter must be measured at least three times to document the trend in the diameter growth curve (otherwise, the CAI growth trend will be a straight line).…”

Section: Discussionmentioning

confidence: 99%

Evaluating agroforestry patterns to increase land productivity of Falcataria moluccana private forests in Central Lombok Regency, West Nusa Tenggara

Nandini¹,

Susila²,

Agustarini³

et al. 2023

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Developing agroforestry systems in private forests is expected to increase productivity. This study aims to determine the appropriate agroforestry design for Falcataria moluccana-based private forests in Central Lombok Regency. Three intercrop species were tested: small taro (Colocasia esculenta), ginger (Zingiber officinale), and vanilla (Vanilla planifolia Andrews). This study was established using a completely randomized design. The three planting combinations were examined in three replications for a total of nine test plots: F. moluccana+vanilla+small taro (FmVT), F. moluccana+vanilla+ginger (FmVG), and F. moluccana+vanilla+ginger+small taro (FmVGT). Each test plot was 10 x 10 m and was located at 3 x 3 m spacing under a 3-year-old F. moluccana stand. The measured variables were crop survival rates, plant yields, and microclimatic data. The correlation between the variables was examined using the Pearson Product Moment, Duncan's advanced multiple range test (DMRT), and analysis of variance (ANOVA). The market price was used to determine the crop's economic value. The best agroforestry design was based on the economic value of crop production and the land equivalent ratio. The results indicated that the combination of F. moluccana, vanilla, ginger, and small taro, which generated an additional income of IDR 11,851,250 ha-1 a year, should be widely promoted and adopted.

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Section: Discussionmentioning

confidence: 99%

Evaluating agroforestry patterns to increase land productivity of Falcataria moluccana private forests in Central Lombok Regency, West Nusa Tenggara

Nandini¹,

Susila²,

Agustarini³

et al. 2023

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“…Dalam menyusun model penduga, hubungan antara diameter dan tinggi pohon merupakan komponen penting diperhatikan untuk melihat keterwakilan kedua variabel tersebut dalam menyusun model penduga volume pohon secara bersama-sama, atau keterwakilan satu variabel menggantikan variabel yang lain (Krisnawati & Bustomi, 2004;Yulianti, 2012;Qirom, 2018 Tabel 3 menunjukkan bahwa diameter dan tinggi pohon memiliki koefisien korelasi sebesar 0,585, yang menunjukkan bahwa diameter pohon dapat menjelaskan lebih dari 58 % variasi dari tinggi pohon. Keeratan korelasi antara diameter dan tinggi pohon model di lokasi penelitian ini lebih kecil dibandingkan dengan lokasi lain di Indonesia yang umumnya mencapai 0,7 (Krisnawati & Bustomi, 2004;Abdurachman, 2013;Qirom & Supriyadi, 2013;Susila & Darwo, 2015). Namun demikian, korelasi diameter dan tinggi pohon di lokasi penelitian ini jauh lebih tinggi dibandingkan dengan areal IUPHHK PT.…”

Section: Model Penduga Volume Pohonunclassified

Timber Volume Estimation Model for Commercial Tree Species in the Logging Area Concession of PT. Tunas Timber Lestari in Boven Digul, Papua

Hutapea

2019

JWAS

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Model penduga volume pohon merupakan salah satu komponen penting dalam mewujudkan pengelolaan hutan lestari. Saat ini, berbagai model telah disusun untuk berbagai tipe hutan di Indonesia. Namun demikian, model-model tersebut belum mewakili tipe ekosistem hutan di Papua. Oleh sebab itu, berbagai studi masih sangat diperlukan untuk menyusun model penduga volume pohon untuk berbagai tipe ekosistem di Papua. Penelitian ini bertujuan untuk menyusun model penduga volume pohon jenis komersial di areal PT. Tunas Timber Lestari di Distrik Sesnukt, Kabupaten Boven Digul, Provinsi Papua. Sebanyak 164 pohon contoh dipilih untuk menyusun model penduga volume pohon dan 50 pohon contoh untuk validasi model. Hasil penelitian menunjukkan bahwa diameter dan tinggi pohon tidak memiliki korelasi yang kuat. Oleh sebab itu, model penduga harus disusun berdasarkan kombinasi diameter dengan tinggi pohon. Model terbaik pada tahapan penyusunan model dipilih berdasarkan nilai koefisien determinasi (R 2), kesalahan standar estimasi (SEE), dan Fhitung. Sementara model terbaik pada tahap validasi model dipilih berdasarkan nilai bias (e), rata-rata kuadrat simpangan (RMSE), simpangan rata-rata (SR), simpangan agregatif (SA), dan χ 2 hitung. Model terbaik untuk menduga volume pohon jenis komersial di PT.

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“…Dalam menyusun model penduga, hubungan antara diameter dan tinggi pohon merupakan komponen penting diperhatikan untuk melihat keterwakilan kedua variabel tersebut dalam menyusun model penduga volume pohon secara bersama-sama, atau keterwakilan satu variabel menggantikan variabel yang lain (Krisnawati & Bustomi, 2004;Yulianti, 2012;Qirom, 2018) Tabel 3 menunjukkan bahwa diameter dan tinggi pohon memiliki koefisien korelasi sebesar 0,585, yang menunjukkan bahwa diameter pohon dapat menjelaskan lebih dari 58 % variasi dari tinggi pohon. Keeratan korelasi antara diameter dan tinggi pohon model di lokasi penelitian ini lebih kecil dibandingkan dengan lokasi lain di Indonesia yang umumnya mencapai 0,7 (Krisnawati & Bustomi, 2004;Abdurachman, 2013;Qirom & Supriyadi, 2013;Susila & Darwo, 2015). Namun demikian, korelasi diameter dan tinggi pohon di lokasi penelitian ini jauh lebih tinggi dibandingkan dengan areal IUPHHK PT.…”

Section: Model Penduga Volume Pohonunclassified

Timber Volume Estimation Model for Commercial Tree Species in the Logging Area Concession of PT. Tunas Timber Lestari in Boven Digul, Papua

Freddy,

Kuswandi

2019

wasian

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The volume estimation model is one of the most important components in developing sustainable forest management. Nowadays, various models for various types of forests in Indonesia have developed. Nevertheless, these models do not represent the type of forest ecosystem in Papua. Therefore, numerous studies are still needed to develop volume estimation model for various types of forests in Papua. This study was aimed to develop timber volume estimation model for commercial tree species in logging concession of PT. Tunas Timber Lestari in Sesnukt District, Boven Digul Regency, Papua Province. A total of 164 trees were chosen to develop the model and 50 trees for model validation. The result showed that diameter did not have a strong correlation with tree height. Therefore, the model should be developed using the combination of diameter and tree height. The best model in the development stage was selected based on the value of coefficient of determination (R2), standard error of the estimate (SEE), and Ftest. The best model in the validation stage was selected based on the value of bias (e), root mean square errors (RMSE), average deviation (SR), aggregative deviation (SA), and χ2test.. The best model for timber volume estimation in PT. Tunas Timber Lestari are V = 0.00007594 D1.978 H0.923.

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RIAP DAN DUGAAN VOLUME TEGAKAN AMPUPU (S.T. Blake) DI KAWASAN HUTAN Eucalyptus urophylla WOLOLOBO, BAJAWA FLORES

Cited by 4 publications

References 3 publications

Evaluating agroforestry patterns to increase land productivity of Falcataria moluccana private forests in Central Lombok Regency, West Nusa Tenggara

Evaluating agroforestry patterns to increase land productivity of Falcataria moluccana private forests in Central Lombok Regency, West Nusa Tenggara

Timber Volume Estimation Model for Commercial Tree Species in the Logging Area Concession of PT. Tunas Timber Lestari in Boven Digul, Papua

Timber Volume Estimation Model for Commercial Tree Species in the Logging Area Concession of PT. Tunas Timber Lestari in Boven Digul, Papua

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