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All Journal Agrienvi : Jurnal Ilmu Pertanian Jurnal Hutan Tropika Jurnal Celebica : Jurnal Kehutanan Indonesia
Tatik Suhartati
Fakultas Kehutanan Institut Pertanian Stiper Yogyakarta
Agriculture, Biological Sciences & Forestry Environmental Science

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Hubungan Karakteristik Biometrik Eucalytus pellita Terhadap Kerusakan Karena Angin: The Relationship of The Biometric Characteristics of Eucalytus Pellita Against Wind Damage Tatik Suhartati; Sugeng Wahyudiono; Ricky Ricky
HUTAN TROPIKA Vol 17 No 1 (2022): Volume 17 Nomor 1 Tahun 2022
Publisher : Jurusan Kehutanan, Fakultas Pertanian Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jht.v17i1.4440

Abstract

Strong winds that occur can damage the Eucalyptus pellita plant thereby reducing wood production at the end of the rotation. Biometric characteristics are very important to predict the criteria for trees that are at risk of damage due to wind. This study aims to determine the biometric characteristics that play a role in the risk of trees being damaged by wind. The study was conducted on Eucalyptus pellita aged 5 years. The biometric characteristics studied consisted of diameter at breast height (DBH), total height (H) and crown length (CL) as well as the ratio of H/DBH (slenderness inde)x and CL/H (percentage of  crown). Binary logistic regression analysis was used to analyized  the probability of tree damage due to wind. The results showed that the regression model with the independent variable H/DBH was a suitable model. The H/DBH ratio or tree slenderness index is a biometric characteristic that contributes 11,4% to explain the risk of wind damage.   Keywords: binary logistic regression ; percentage of  crown; slenderness index
STRUKTUR DAN KOMPOSISI PEPOHONAN SEBAGAI KERAGAAN PEKARANGAN di Desa Terong, Kabupaten Bantul, Daerah Istimewa Yogyakarta Tatik Suhartati; Purwadi
Agrienvi: Jurnal Ilmu Pertanian Vol. 15 No. 2 (2021): Agrienvi : Jurnal Ilmu Pertanian
Publisher : Agrienvi: Jurnal Ilmu Pertanian

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Abstract

Pohon di luar kawasan hutan memiliki nilai ekonomi, sosial dan lingkungan yang signifikan serta merupakan bagian integral dari ekosistem yang harus diperhitungkan dalam pendekatan pengelolaan hutan berbasis ekosistem. Informasi tentang pohon di luar kawasan hutan sangatlah spesifik berdasar tapaknya. Salah satu lahan yang dimanfaatkan untuk menanam pohon di luar kawasan hutan adalah pekarangan. Keragaan pekarangan antara lain dapat dilihat dari struktur tegakan dan komposisi jenisnya. Struktur tegakan yang dicermikan oleh distribusi diameter pohon dapat digambarkan dalam model matematis. Penelitian ini bertujuan mengetahui komposisi jenis dan pola distribusi diameter pohon pada lahan < 5000 m2. Pola distribusi ini dapat dimanfaatkan untuk menilai ketersediaan regenerasi dan membantu mengarahkan pengelolaan lahannya. Luas lahan dibagi menjadi 3 kategori yaitu luas < 1.000 m2 ; luas 1.000-2000 m2 dan luas 2.000-5000 m2. Masing-masing kategori luas diambil 4 sampel pekarangan. Inventarisasi dilakukan 100 % terhadap pepohonan yang ada di lahan. Analisis model distribusi diameter menggunakan model eksponensial. Hasil penelitian menunjukkan bahwa komposisi jenis kayu pekarangan merupakan kekayaan biodiversitas, yang menyimpan spesies berkayu dari 20 famili, sehingga turut menjaga biodiversitas. Distribusi diameter berbentuk model eksponensial. Kurva model eksponensial menyerupai pola distribusi diameter pada hutan alam yaitu berbentuk J terbalik, yang menunjukkan kondisi populasi stabil atau status regenerasi yang baik. Kondisi itu dapat menopang kelestarian asalkan tetap dijaga pengaturan tebangan dan dilakukan perlakuan silvikultur yang sesuai dengan kondisi pohon, lahan, ketersediaan tenaga kerja serta biaya.
Penentuan Daur Optimal Jati Unggul Nusantara (JUN) di BDH Paliyan KPH Yogyakarta Tatik Suhartati; Sugeng Wahyudiono; Nugroho Cahyo Wicaksono; Purwadi Purwadi
Jurnal Celebica : Jurnal Kehutanan Indonesia Vol. 4 No. 2 (2023): Volume 4, No 2 (2023): Jurnal Celebica : Jurnal Kehutanan Indonesia
Publisher : Jurusan Kehutanan -FHIL-UHO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/jc.v4i2.31

Abstract

Sustainable forest management requires planning forest management strategies that are based on growth and yield information. This information can be provided, among other things, through growth modeling. Therefore, the management of Jati Unggul Nusantara (JUN), which is the result of breeding Jati Plus Perhutani (JPP) trees, requires information about growth, yield and optimal cycles. The research aims to obtain a diameter growth model, free branch height, estimated volume and optimal volume cycle of JUN. Sampling was carried out using the systematic sampling method with random start. A total of 5 measuring plots were taken in each plot representing ages 3, 5 and 7 years. The parameters observed were diameter at breast height and free branch height. The models used are the Logarithmic Model, Inverse Model, and S Model. Model selection is carried out through model acceptance tests and validation tests. The model chosen to estimate the diameter at chest height of JUN is Model S with the equation Dbh = e(3.358 - 4.270/u). The model chosen to estimate the free branch height of JUN is Model S with the equation Tbc = e( 1,727 +( -3,100) /u. The optimal cycle of JUN in KPH Yogyakarta occurs at the age of 12 years and the volume obtained is 76,648 m3/ha. Key words : optimal cutting cycle, jati unggul nusantara, growth model
Co-Authors Nugroho Cahyo Wicaksono Purwadi Purwadi Purwadi Ricky Ricky Sugeng Wahyudiono