The forest fire in Mianning, Sichuan Province has been put out. What was the cause of the fire?
Natural factors of forest fires The natural factors that cause forest fires are dry plants themselves and forest fires caused by climate. Generally speaking, there will be more dead leaves and weeds in the forest, and some resins and tree oils secreted by trees are highly flammable substances. As long as there is a spark, they can be burned. For example, our common pine trees can secrete turpentine. Turpentine is a very flammable substance, which is very hot. It can be used to make candles and torches that we see every day, but in case of forest fire, turpentine will play a great role in supporting combustion. These are the material bases that cause forest fires. If the air was dry and the temperature was high, the forest might spontaneously ignite under some conditions. At this time, if there is some wind, it will help the fire ignite the forest fire. Sometimes lightning strikes trees, which may also cause fires.
Of course, there are fewer forest fires caused by natural factors, after all, the probability is low. Common forest fires are mostly caused by human factors, mainly because people bring kindling into the forest. The common causes of forest fires caused by human factors are: burning paper and incense when worshipping ancestors and sweeping graves on the mountain leads to the spread of fires; Others smoke in the mountains and throw cigarette butts into the grass without stubbing them out; Others reclaim wasteland at the foot of the mountain, and it is difficult to control the spread of flames to the mountains; There are some unimaginable fire causes among human factors. For example, someone shovels turf near the foot of the mountain to burn ashes, which is well controlled and will not cause a fire. But I never imagined that a strong wind blew the burning hay into the forest, and the forest was ignited, which triggered a forest fire. This is more difficult to prevent.
The recent high temperature in Liangshan Prefecture Since March and April, several forest fires have occurred in Liangshan Prefecture, and the reasons have a lot to do with the recent high temperature in the local area. In these two months, the temperature in Liangshan Prefecture was two or three degrees higher than that in the same period of last year, and the precipitation was also reduced by half. It has always been one of the areas with the highest fire alarm level and long fire alarm duration in China, and the possibility of forest fire is greater. In this case, we can only try to control the fire caused by human factors, and never bring the fire into the forest or move at the foot of the mountain.