Rehabilitation technique in degraded forestland using Shorea leprosula cuttings: study on production potential and biomass accumulation

Abstract

Shorea leprosula is a promising species to be used for reforestation and offers opportunities for enhancing carbon sink. The study was carried out in Gunung Dahu Forest Research, Indonesia. This paper reports growth performance, production potential and biomass accumulation of 12-yr-old Shorea leprosula by measuring the tree growth attributes. Based on the basal area, destructive samplings of 18 representative trees were done. The results showed that diameter and height growth and the proportion of canopy were found to have a positive relationship with the spacing regime. Growth performance in monoculture planted-system showed better results than other in mix planted-system for all spacing regimes. The regression models related to growth parameters, such as diameter (D) and height (H) to stem volume and biomass were constructed, then used to estimate stem and biomass accumulation. Production potential are 154.85, 136.97, 38.95 and 83.22, 72.99, 48.41 m3/ha for monoculture planted of 2 x 2, 3 x 3, 5 x 5 and mix planted of 2 x 2, 3 x 3 and 5 x 5 m spacing, respectively and their total biomass accumulations are 89.89, 76.78, 24.27 and 49.74, 43.95, 30.05 Ton/ha. The figure for production potential and biomass accumulation indicated that their quantifications can be estimated using D and D-H.