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Pemodelan Dinamika Sebaran Diameter Tegakan Jati Klon di Perhutani

SISKA PUPUT O, Djoko Soeprijadi, S.Hut., M.Cs.

2021 | Skripsi | S1 KEHUTANAN

Jati Klon telah dikembangkan Perhutani sebagai alternatif untuk meningkatkan produktivitasnya. Dalam implementasi manajemen hutan lestarinya, Perhutani memerlukan model pertumbuhan tegakan. Keberadaan model ini diperlukan untuk menentukan strategi pengaturan hasil seperti penentuan siklus tebang, dan keputusan silvikultur. Penelitian ini bertujuan membangun model penduga dinamika sebaran diameter tegakan Jati Klon, sebagai dasar pengembangan studi dari pertumbuhan dan hasilnya. Penelitian dilaksanakan di lokasi uji coba penanaman perhutanan Jati Klon stek pucuk wilayah operasional Perhutani di KPH Pemalang dan KPH Ngawi tahun 2020. Pemodelan dilakukan dengan analisis regresi berganda menggunakan variabel prediktor berupa parameter Weibull, yaitu Beta (parameter bentuk), Gamma (parameter lokasi), dan Miu (parameter skala), sedangkan variabel independen berupa umur dan peninggi. Variabel prediktor diperoleh dari Tim Penelitian dan Pengembangan (Litbang) Kehutanan, sedangkan variabel independen diperoleh dari hasil pengukuran secara langsung berdasarkan beberapa pertimbangan dari nilai koefisien determinasi (R pangkat 2), kebebasan multikolinearitas, dan nilai Normalized Root Mean Square Error (NRMSE). Proses pemodelan menghasilkan model terbaik sebagai berikut: 1. Beta = ((-0,001)x(X2 pangkat 2)) + ((0,553)x((X2/X1)-(0,047x(X2/X1) pangkat 2)) + (0,053xX1), (R pangkat 2) = 0,96 dan NRMSE = 17%, 2. Gamma = ((-0,016)x(X1 pangkat 2)) + ((0,396)x(X2/X1))-((0,032)x((X2/X1) pangkat 2)) + (0,429 x X1)+(0,049 x X2), (R pangkat 2) = 0,98 dan NRMSE = 12%, 3. Miu = ((0,589)x(X2/X1))-((0,049)x((X2/X1) pangkat 2)) + (0,132xX1), (R pangkat 2) = 0,98 dan NRMSE = 19%. Nilai (R pangkat 2) dan NRMSE memperlihatkan bahwa model ini diterapkan pada penyusunan model pertumbuhan tegakan.

Clonal teak has been developed by Perhutani as an alternative to increase its productivity. In impelementing its sustainable forest management, Perhutani requires a stand growth model. The existence of this model is needed to determine yield regulation strategies such as determining the cutting cycle, and silvicultural decisions. This study aims to build a model for estimating the dynamics of the diameter distribution of teak clone stands, as a basis for developing studies of growth ang yields The research was carried out at the trial location for forestry planting of Teak clones, cuttings of shoots from Perhutani operational areas in KPH Pemalang and KPH Ngawi in 2020. The modeling was carried out by multiple regression analysis using of Weibull function parameters, namely Beta (shape parameter), Gamma (location parameter), and Miu (scale parameter), while the independent variables are age and top height. The predictor variables were obtained from the Forestry Research and Development, while the independent variables were obtained from the results of direct measurements on Permanent Measurement Plots (PSP). The selection of the best model is based on several considerations of the coefficient of determination (R degree 2), multicollinearity level, and Normalized Root Mean Square Error (NRMSE). The modeling produces the best model as follows: 1. Beta = ((-0,001)x(X2 degree 2)) + ((0,553)x((X2/X1)-(0,047x(X2/X1) degree 2)) + (0,053xX1), (R degree 2) = 0,96 and NRMSE = 17%, 2. Gamma = ((-0,016)x(X1 degree 2)) + ((0,396)x(X2/X1))-((0,032)x((X2/X1) degree 2)) + (0,429 x X1)+(0,049 x X2), (R degree 2) = 0,98 and NRMSE = 12%, 3. Miu = ((0,589)x(X2/X1))-((0,049)x((X2/X1) degree 2)) + (0,132xX1), (R degree 2) = 0,98 and NRMSE = 19%. The values of (R degree 2) and NRMSE show that this model is can be applied to the development of stand growth models.

Kata Kunci : Jati Klon, Model Pertumbuhan, Struktur Tegakan;Teak Clones, Growth Model, Stand Structure

  1. S1-2021-409354-Abstract.pdf  
  2. S1-2021-409354-Bibliography.pdf  
  3. S1-2021-409354-Tableofcontent.pdf  
  4. S1-2021-409354-Title.pdf