Combustibles in Fires of Major Forest Fires in Kunming

In order to assess the risk of fires that may occur again in the burning area and the potential fire behavior, a field survey was conducted on the major forest fires in the village of Xiaotuo Village, Tuanjie Street, Xishan District. By setting the plot, measuring the vegetation height, coverage, crown width, etc. Collecting combustibles in the plot, including the surface combustibles of young and middle age of Pinus yunnanensis var. pygmaea, Lithocarpus mairei, and the whole plant of Eupatorium adenophora. The load, calorific value, ash content and fire intensity of combustibles were measured and calculated in the laboratory. Results show that the combustible content loads of the young and middlePinus yunnanensis var. pygmaea forest, Lithocarpus mairei and Eupatorium adenophora are 0.40 , 0.44 , 0.47 kg/m² and 1.13 kg/m², respectively. The ash content of 4 forest types is 2.64%, 2.24%, 6.52% and 2.25%, respectively, with their corresponding calorific value as 20 730, 21 510, 20 557 kJ/kg and 19 138 kJ/kg, respectively. Also, fire intensity of 4 forest types is 1 426 , 1 590 , 745 kw/m and 524 kw/m, respectively, which should belong to the category of medium and low-intensity fires, and it is very likely that major forest fires will occur again in the case of fire.