MODEL PENDUGAAN CADANGAN BIOMASSA DAN KARBON HUTAN TROPIS BASAH DI PT SARI BUMI KUSUMA, KALIMANTAN TENGAH

Baroroh Wista Anggraeni, Dr. Ir. Ris Hadi Purwanto, M.Agr.Sc

2011 | Tesis | S2 Ilmu Kehutanan

Penelitian ini bertujuan menyusun model allometrik untuk pendugaan kandungan biomassa dan karbon tegakan di PT SBK, menguji penerapan beberapa model pendugaan biomassa yang sudah ada dan diduga dapat diterapkan di PT SBK, dan menyusun model faktor ekspansi biomassa total dan tiap organ tanaman untuk tegakan hutan di PT SBK. Penelitian dilakukan di areal IUPHHK PT. SBK Propinsi Kalimantan Tengah, pada tanaman jalur diambil 23 pohon sampel dan pada hutan yang dikelola dengan TPTI 17 pohon sampel. Teknik pengukuran sampel pohon dilakukan secara destructive. Pengukuran kandungan karbon dilakukan dengan metode Walkey and Black. Model allometrik untuk pendugaan cadangan biomassa dan karbon secara umum adalah Ln Y = Ln a + b Ln X dengan variasi X adalah Dbh, Dpkl, kerapatan kayu, biomassa dan karbon batang. Penerapan model allometrik yang sudah ada menunjukkan hasil yang berbeda terhadap hasil penelitian ini. Model BEF untuk pendugaan biomassa total pada hutan tanaman jalur dan hutan yang dikelola dengan TPTI sebesar 2,19 dan 1,82. Model scalling factor Ebr, El, dan Er adalah 1,46; 1,21; 1,25 untuk hutan tanaman jalur dan hutan yang dikelola dengan TPTI adalah 1,27; 1,11 ; 1,16.

The research aimed to develop the allometric models for prediction of biomass and carbon stock of forests in PT SBK, to assess the suitability of previously published allometric models that could be applied in PT SBK, and to develop models of the forest biomass expansion factor and scalling factor in PT SBK. The data were collected in PT. SBK, Central Kalimantan. The number of trees sampled in this research was 23 with their dbhs range from 2 to 32 cm in the line planting system and 17 trees with diameters fom 1.1 up to 115 cm in forest with TPTI system. Destructive sampling was used to collect the samples. Carbon content is typically derived from measurements by the method of Walkey and Black. The most suitable allometric model is Ln Y = Ln a + b Ln X where diameter at breast height (D), buttresses diameter (Dpkl), wood density (ρ), stem weight (Ws), and stem carbon (Cs) were used as predictors for total biomass and carbon stock of forest. A comparison of above-ground biomass to previous research report in tropical rainforests implies that our allometric models differ largely from the general models. BEF models for forest with line planting and TPTI system were 2.19 and 1.82, respectively. Scaling factor models; Ebr, El, and Er are 1.46; 1.21; 1.25 for forest with line planting and for forest with TPTI system are 1.27: 1.11: 1.16, respectively.

Kata Kunci : model allometrik, biomassa, karbon, BEF, scalling factor, hutan tropis basah