Forest Management Plan - Sabah Forestry Department

74 10 6.50 4.30 20.80 244.6 575 8.50 13.50 7.40 29.40 638 476 Burnt Burnt Burnt - 625 477 4.76 6.43 2.67 13.86 423 478 18.50 38.50 11.70 68.70 859 479 26.00 16.00 5.00 47.00 341 480 10.50 19.00 5.80 35.30 523.8 480 - - - - 245.2 581 18.80 20 14.80 53.60 345 481 20 21.40 9.30 50.70 195 583 18.00 42.80 5.30 66.10 143.5 383 14.68 20.06 3.66 39.41 318.5 484 37.60 33.60 14.40 85.60 486 4The results of the inventory on Potential Crop Trees indicate that much of the forest ispoorly stocked based on the stocking standards prescribed for Timber StandImprovement. A total of 24 compartments requires intensive restoration (less than 35PCTs/ha). Another 32 compartments are stocked with less than 50 PCTs/ha and mayrequire enrichment planting. The remaining compartments have sufficient stocking ofPCTs but should undergo climber cutting and possibly liberation thinning to release thesmaller PCTs from light competition with climbing bamboo and woody vines.3.3 Prospects for HarvestingBased on the forest field inventory, the prospects for harvesting over the 10-yearplanning period were evaluated. For this, growth projections of the inventory data weremade to determine when a compartment is likely to yield an economic harvest (AppendixE). Although the management planning period spans over a period of 10-years, growthprojections were made for one cutting cycle in order to ensure that harvesting issustainable over the long-term.For the purpose of yield regulation, a 40-year cutting cycle is assumed for thismanagement plan, and a minimum economic cut of 40 m 3 ha -1 is used to determine when acompartment is adequately stocked to justify a harvest. This translates to about 8-9good quality commercial trees ha -1 ranging 60 - 100 cm dbh. In general about 60% oftrees eligible for harvesting are actually not extracted due to defects and operationalconstraints. Taking these results into account a gross density of about 15 commercialtrees/ha is required for compartments to be ready for harvesting.Growth projections show that only 228 ha (within compartments 5 and 32) may beharvested after the 10-year planning period, and a total of 11,556 ha (23 %) may be22