以陕西 93种树种的枝为试样 ,在 2 40℃条件下对可燃性气体逸出率及其变化的测定表明 :可燃性气体逸出率和时间之间的关系符合模型V =a +b/t;在 2 40℃条件下 ,以 1 0min时段内的气体逸出率变化最大 ,用此指标选择抗火树种效果明显 ,可燃性气体逸出程度作为评价树种燃烧性的一个指标 ,为防火树种的选择提供了依据 .就该温度条件下气体释放程度考虑 ,栓皮栎、紫薇、山杨、栾树、榛子、铁杉、青木千、梨、短柄泡、牛奶子、杏等树种的阻火性能良好 Taking the branches of 93 tree species in Shaanxi as samples, the determination of the evasion rate and its change of combustible gas at 240 ℃ showed that the relationship between the evacuation rate of combustible gas and time accords with the model V = a + b / t; at 2 40 ℃ conditions, the evolution of gas escape rate within 10min at the maximum, using this indicator to select fire-resistant tree effect is obvious, the degree of flammable gas escape as an indicator of species combustion, for fire prevention The choice of tree species provides the basis for the release of gas under the conditions of temperature, cork oak, crape myrtle, aspen, Koelreuteria paniculata, hazelnut, hemlock, Aoki thousands, pear, short bubble, milk, Good performance