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以东北林业大学帽儿山实验林场蒙古栎次生林下的蒙古栎凋落叶片为材料,根据研究地区同类可燃物的野外条件,在实验室内构建了不同载量、高度和含水率的可燃物床层,进行100次平地无风条件下的点烧试验.结果表明:平地无风条件下蒙古栎阔叶床层的林火蔓延速率不超过0.5m·min-1;可燃物含水率、床层载量和高度对蒙古栎阔叶床层的林火蔓延速率具有显著影响;含水率对林火蔓延速率的影响与可燃物床层高度、载量等无显著关系,而可燃物床层高度对林火蔓延速率的影响与可燃物床层载量有关.可燃物床层压缩比对蒙古栎阔叶床层的林火蔓延速率影响不大.以可燃物含水率、床层载量和高度为预测因子的林火蔓延速率预测模型能解释83%的林火蔓延速率变差,模型的平均绝对误差为0.04m·min-1,平均相对误差不超过17%.
The litter of Quercus mongolica seedlings under the secondary forest of Q. mongolica in Maoershan Experimental Forest Farm of Northeast Forestry University was used as material. According to the field conditions of similar combustibles in the study area, combustibles beds with different loading, height and water content were constructed in the laboratory , The burning test was carried out under the condition of no wind for 100 days.The results showed that the forest fire spread rate of Quercus mongolica broad-leaved bed did not exceed 0.5m · min-1 under the condition of flat ground without wind, and the combustible moisture content, bed load The quantity and height of forest fire had a significant effect on the rate of forest fire spread in the deciduous broad-leaved Quercus mongolica. The effect of moisture content on the spread of forest fire was not related to the bed height and loading of combustibles, The influence of fire spread rate is related to the bed load of combustibles.The compressibility ratio of combustible material bed has little effect on the spread of firebreak in Quercus mongolica broad-leaved bed.Based on the predictions of combustibles moisture content, bed loading and height The model of forest fire spread rate can explain 83% of the forest fire spread rate variation, the average absolute error of the model is 0.04m · min-1, and the average relative error is less than 17%.