Biomass Resource Assessment Part I - Gainesville Regional Utilities

in fuel chips and the carbon in fuel combusted during its harvest and transport. Equipmentevaluated in the fuel chip harvesting operation included the Tigercat726B 240 HP feller, theTigercat 630C and 630B 240 HP grapple skidder, the Tigercat 240B 190 HP knuckleboomloader, the Morbark NCL 30 Chipper, both 850, and 1,000 HP, and the Kenworth 425 HP tractorwith 46 foot trailer. Harvest yields and diesel consumption rates of four projects evaluated byCondon and Putz are show in Table 36. When CO 2 emissions from harvest and transportationare divided by potential energy generation, total CO 2 emissions from production yields 38 to 44kg CO 2 MWh -1 , higher than the 4 to 6 kg CO 2 MWh -1 reported by Yoshioka et al. (2006).Higher emissions are expected as more energy is required to thin natural stands than to collectlogging residues from plantation harvests. Still, the emissions are less than the 341 and 304 kgCO 2 MWh -1 reported above from coal and oil respectively.100