Comparative Study on Surface Litter Load and Fire Intensity of Pinus armandii and Pinus yunnanensis in Northeastern Yunnan Province

Through the investigation, layout of sample plots, sampling of combustibles and other processes. The surface litter of the dominant species, Pinus armandii and P. yunnanensis, in northeastern Yunnan are divided into 3 levels: dead branch, upper layer litter and lower layer litter. After the collection, respectively, the following slope ignition and uphill ignition methods were performed on the laboratory combustion bed to simulate the combustion conditions of the uphill and downhill fires of the actual forest plot slope, and the fire behavior parameters of different ignition modes were determined. The results show that the burning rate of surface litter in P. yunnanensis is much higher than that in P. armandii. The combustible load of the 2 materials is basically the same except for the lower layer of litter, and the heat radiation values are basically the same, but both of them are lower than the weak intensity fire value of 500 kW/m. Therefore, it is difficult to form a canopy fire in northeastern Yunnan.