One of the conditions of forest fire is to have flammable materials, and the litter accumulated on the surface is a good match. The previous Liangshan forest fire was related to surface deposits. After long-term accumulation, the ground vegetation and combustible materials under the forest rot and deteriorate, producing a large number of combustible gases. The decomposed combustible materials are mixed together and will burn or even deflagrate when exposed to an open flame. The occurrence of forest fires is also related to climate. High temperature and low humidity are the best environment in the dry climate where fires often occur, which is generally common in spring and autumn, and sometimes occurs when there is little rain in summer.
Gale weather is also an important condition for mountain fires. Wind can change the thermal convection, provide oxygen for combustion, make the wind direction of the ignition point changeable, and make the fire extinguishing more difficult.
Australian mountain fires burned for half a year on 20 19, causing great ecological damage. The forest density in Australia itself is very high, and there are local regulations that prohibit indiscriminate cutting, and even cutting the isolation belt should not be allowed. In addition, the trees at the fire point are all oily eucalyptus trees, which are difficult to put out and will spread intensively. In addition to the serious damage to trees, the animals in the forest are almost extinct. For example, koalas are small and slow-moving. When they escape, they are used to moving to the crown of trees, so they will be swallowed up by fire.
It must be said that the ability of Australian residents to cope with fires is indeed a bit slow, and the number of firefighters is insufficient, so the fire fighting work is progressing very slowly. Because the mountain fires in Australia have also brought great influence to the global climate. The smoke from the fire even drifted to South America along the west wind.