A forest fire broke out in Yunlong, Dali, and two ecological rangers were killed. Why is it difficult to put out forest fires?

Forest is the main body of terrestrial ecology, which plays an important role in regulating climate, conserving water, conserving soil and water, preventing wind and fixing sand. If these precious forest resources are destroyed by fire, it will not only bring huge losses to people's lives and property, but also lead to the change and destruction of the whole ecosystem once the virgin forest formed over a long period of time is destroyed, which will seriously affect human life.

The burning area of the mountain fire is too large and the firepower is too strong. It is very difficult to put out the fire by relying on individual equipment such as wind extinguishers. I am wearing a professional fire suit and a wind fire extinguisher. When I was three meters near the burning point, I was soaked through. After three minutes, I was exhausted and even had no strength to eat. Even if you rely on large flying equipment to throw chemicals, the effect is limited. The biggest feature of mountain fires is that they are linked together. If the line of fire cannot be leveled in time, the fighting part will be revived immediately.

More than 90% of forest fires are caused by human factors. There are many combustible materials in the forest. For example, in Daxinganling forest region, coniferous and broad-leaved mixed forests, such as birch, larch and Mongolian pine. Quercus mongolica is widely distributed, and the forest land is covered with a lot of litter and humus. In the dry season, once these combustibles meet the fire source, it is easy to cause forest fires.

Special attention should be paid to forest fire prevention in the season of dry climate, yellow vegetation, high temperature and strong wind. When a forest fire breaks out, does it spread fast on the flat ground or on the hillside? Generally speaking, the important factors closely related to the spread speed of forest fires are wind and terrain. Under the same conditions of wind, combustible and oxygen, the fire on the hillside will spread faster than that on the flat ground. Under the same conditions, the fire on the hillside will spread faster than that on the flat ground. This is because when the fire burns from the mountain to the foot of the mountain, when the terrain blocks the wind, it will form an upward airflow, which can accelerate the spread of forest fire to the hillside. Therefore, after a forest fire breaks out, the fire will spread rapidly and get bigger and bigger.