Penentuan Faktor Konversi Biomassa Nipah (Nypa frruticans) di Kabupaten Cilacap

Abstract

Metode pendugaan biomassa nipah menggunakan metode konversi volume pohon menjadi metode alternatif yang merupakan kombinasi antara volume silinder, kerapatan kayu, faktor bentuk absolut (f1), dan Biomass Expansion Factor (BEF). Metode ini umumnya digunakan ketika model alometrik biomassa masih belum tersedia. Penelitian ini bertujuan menentukan faktor bentuk, kerapatan kayu, dan BEF untuk pendugaan biomassa pelepah nipah berdasarkan metode konversi volume serta menguji keakuratannya. Penelitian ini menggunakan sebanyak 24 sampel pelepah nipah yang diperoleh secara destructive sampling di Desa Ujungalang, Kabupaten Cilacap. Sampel pelepah contoh dianalisis di laboratorium guna mendapatkan faktor bentuk, kerapatan kayu, dan biomassa total setiap pelepah. Faktor bentuk yang diperoleh sebesar 0,24, rata?rata kerapatan kayu sebesar 0,429 g/cm3, dan nilai BEF sebesar 2,30. Adapun nilai ME sebesar -0,14 kg, PE sebesar -11,19%, dan MAPE sebesar 39,7%. Hasil penelitian ini menunjukkan bahwa pendugaan biomassa memberikan nilai estimasi biomassa pelepah yang akurat walaupun sedikit overestimate. Dengan demikian, metode ini dapat digunakan sebagai metode alternatif pendugaan biomassa pohon khususnya bagi tanaman nipah.

The nypa palm biomass estimation method uses the tree volume conversion method as an alternative method which is a combination of cylindrical volume, wood density, absolute form factor (f1), and Biomass Expansion Factor (BEF). This method is generally used when the biomass allometric model is still not available. This study aims to determine the form factor, wood density, and BEF for estimating nypa palm frond biomass based on the volume conversion method and to test its accuracy. This study used 24 nypa palm frond samples obtained by destructive sampling in Ujungalang Village, Cilacap Regency. The sample frond samples were analyzed in the laboratory to obtain the form factor, wood density, and total biomass of each frond. The form factor obtained was 0,24, the average wood density was 0,429 g/cm3, and the BEF value was 2,30. The ME value was -0,14 kg, PE was -11,19%, and MAPE was 39,7%. The results of this study indicate that biomass estimation provides accurate estimates of frond biomass although it is slightly overestimate. Therefore, this method can be used as an alternative method for estimating tree biomass, especially for nypa palms.