Model Penduga Biomassa Pohon Agathis (Agathis loranthifolia) Berdiameter Kecil di Hutan Pendidikan Gunung Walat, Sukabumi, Jawa Barat

Abstract

One of the tree species for rehabilitation in Gunung Walat University Forest (GWUF) is agathis (Agathis loranthifolia). The biomass of small diameter agathis (≤ 10 cm) can be estimated by using Biomass Expansion Factor (BEF) and allometric biomass model, either for each tree component (stem, branches and twigs, and leaves) or for the total of above ground biomass. Based on data analysis using 32 sample trees, the stem biomass was 74%, branch biomass was 16%, and leaf biomass was 10%. The BEF of small diameter agathis was 1.075 (for lower wood density (WD)), 1.022 (for medium WD), and 0.944 (for higher WD). The allometric biomass models for each tree component and total biomass are Wstem = 0,0139dp3,132 (R2 = 99,2%), Wbranches and twigs = 0,0042dp2,963 (R2 = 97,3%), Wleaves = 0,0115dp2,276 (R2 = 97,1%), and Wtotal = 0,0276dp2,945 (R2 = 99,0%), where dp is collar diameter