Posted by: wahyukdephut | February 3, 2009

MODEL PENDUGAAN BIOMASSA POHON MAHONI (Swietenia macrophylla King) DI ATAS PERMUKAAN TANAH

MODEL PENDUGAAN BIOMASSA
POHON MAHONI (Swietenia macrophylla King) DI ATAS PERMUKAAN TANAH
[Biomass estimation model of
above ground mahogany (Swietenia macrophylla King) tree]

Oleh/by :
Wahyu Catur Adinugroho dan/and Kade Sidiyasa
ABSTRACT
The Kyoto protocol involved the Clean Development Mechanism (CDM) to control carbon that produced by countries in the world. Forest absorb CO2 from the air through photosynthesis process and save it as a forest biomass. To estimate the total of biomass in the forests, non-destructive sampling by allometric model and biomass expansion factor (BEF) method could be used. The goal of this research was to get BEF value and produced the allometric model or equation to estimate the biomass of mahogany trees. To come to this goal, therefore 30 trees samples were selected purposively, and then the biomass values were calculated. Calculation the stem biomass and regular branches biomass used the volume approach, while the others biomass by weighing. The biomass estimation model was produced by analyzing the correlation between biomass value and tree dimension. Result of this research shows that highest biomass found at the stem part of the trees that is 73% of the total of the above ground tree biomass, followed by biomass of the branches (17%), stump (5%), leaves (3%) and twigs (2%). The allometric model produced as the result for the mahogany tree was B = aDb , where : B = biomass (kg) ; D = diameter (cm) ; a, b = constant. The resulted regression equation are stem biomass (Bbtg) = 0.044 D^ 2.61 (R2 = 94.7%), branches biomass (Bcab) = 0.00059 D^ 3.46 (R2 = 83.5%), twigs biomass (Branting) = 0.0027 D^2.42 (R2 = 65.6%), stump biomass (Btunggak) = 0.022 D ^1.96 (R2 = 65.6%), leaves biomass (Bdaun) = 0.0138 D ^1.93 (R2 = 70%), above ground tree biomass (Btotal) = 0.048 D ^2.68 (R2 = 95.8%). Average BEF value of mahogany trees is 1.36 (stem biomass measured until total height) and 2.16 (stem biomass measured until clear bole).

Keywords : Clean development mechanism, biomass, carbon, biomass allometric model, biomass expansion factor, Swietenia macrophylla King

ABSTRAK
Protokol Kyoto meliputi mekanisme pembangunan bersih dalam rangka mengontrol karbon yang dihasilkan oleh negara-negara di dunia. Hutan menyerap CO¬2 dari udara melalui proses fotosintesis dan menyimpannya sebagai biomassa hutan. Untuk menduga jumlah biomassa di dalam hutan, pendekatan secara tidak langsung melalui model alometrik dan metode biomass expansion factor (BEF) dapat digunakan. Tujuan penelitian ini adalah untuk memperoleh besarnya nilai BEF dan membuat model alometrik dalam menduga besarnya biomassa pada pohon mahoni. Untuk mencapai tujuan penelitian tersebut maka ditentukan sebanyak 30 pohon contoh yang ditetapkan secara purposif, yang selanjutnya dilakukan penghitungan biomassa. Biomassa batang dan cabang yang beraturan dihitung dengan menggunakan pendekatan volume sedangkan biomassa bagian lainnya dihitung dengan penimbangan langsung. Model pendugaan biomassa dihasilkan dengan menganalisa hubungan antara nilai biomassa dengan dimensi pohon. Hasil penelitian memperlihatkan bahwa jumlah biomassa tertinggi terdapat pada bagian batang yakni mencapai 73% dari biomassa keseluruhan pohon di atas permukaan tanah, kemudian diikuti oleh biomassa cabang (17%), tunggak (5%), daun (3%) dan ranting (2%). Model alometrik yang dihasilkan untuk menduga biomassa pada pohon mahoni adalah B=aDb, dimana B = biomassa (kg) ; D = diameter (cm) ; a, b = konstanta. Persamaan regresi yang dihasilkan tersebut adalah biomassa batang (Bbtg) = 0,044 D^ 2,61 (R2 = 94,7%), biomassa cabang (Bcab) = 0,00059 D^ 3,46 (R2 = 83,5%), biomassa ranting (Branting) = 0,0027 D^2,42 (R2 = 65,6%), biomassa tunggak (Btunggak) = 0,022 D^ 1,96 (R2 = 65,6%), biomassa daun (Bdaun) = 0,0138 D^ 1,93 (R2 = 70%), biomassa pohon diatas permukaan tanah (Btotal) = 0,048 D ^2,68 (R2 = 95,8%). Sedangkan nilai ”BEF” rata-rata untuk pohon mahoni adalah 1,36 (biomassa batang keseluruhan) dan 2,16 (biomassa batang bebas cabang).

Kata kunci : Mekanisme pembangunan bersih, biomassa, karbon, model alometrik, biomassa, biomass expansion factor, Swietenia macrophylla King

Read More : biomasa-mahoni-edit4


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