In this study, coniferous (pitch pine, Pinus rigida) and broad-leaved (Oriental oak, Quercus variabilis) trees were gasified in a bubbling fluidized bed reactor, and the effects of reaction temperature and catalyst species on product yields and selectivities were systematically investigated. Upon increasing the gasification temperature from 800 to 900 degrees C, the gas yield of P. rigida maintained similar values at 75.15-78.41%, while the gas yield of Q. variabilis decreased from 71.05 to 58.15% and the char and oil yields increased. The composition of gaseous products was affected according to catalyst species. When dolomite-based catalysts were used for fog biomass gasification, the hydrogen fraction increased substantially, while the carbon monoxide fraction decreased.