Analysis of open fire barriers

Time for setting up a fire separation zone: The time for setting up a fire separation zone every year starts from mid-July to the end of mid-August. During this time, the soil was ploughed and the seeds of the herb plants were generally not mature. The number of weeds on the isolation belt in the second year was small and the fire-resistance effect was good. The amount of operations was also small when plowing again. If the operation time is too early and the growth period is long, the weeds will be regenerated and will not be able to achieve a fireproof effect. When the operation time is late, most of the weed seeds will mature into the soil and the tillage will be beneficial to the growth of weeds. The role of time; too late, the cold weather is difficult to work.

Width of the separation zone: Through the analysis of the principles of fluid mechanics and the experience of many years in the Humeng League, it has been found that the wind speed is rapidly reduced by 3 to 5 times the tree height on the windward side of the forest margin. The height of the Pinus sylvestris tree is generally about 15 meters, which means The range of wind speed reduction is 45 to 75 meters away from the forest edge trees. According to this principle, Humeng set a width of 80 m in the outer forest edge of the Pinus sylvestris enclosure area. The wind speed in the forest is lower than that outside the forest. The distance between the fire wind and the wood is about 30 meters, so the forest Fire barrier width is generally 40 to 60 meters. The establishment of a machine-tilled fire-retardant raw soil belt can effectively prevent the spread of fire on the ground, prevent the occurrence of canopy fire, and cut off the hidden underground fire hazard. Tillage depth: Generally about 20 centimeters in depth, this depth can not only make the roots of herbaceous plants come out and reduce the underground fire. The soil layer that is turned out can buckle all the ground parts of the herb plants and separate them. Ground fire effect.

The function of setting up a fire separation belt: According to many years of practical experience, it is believed that the fire isolation belt has the following functions: 1 Isolating the ground fire, crown fire and underground fire to prevent the spread of fire; 2 Fire barriers can be used as traffic roads, It facilitates patrolling within the forest and fighting fires. It combines forest fire containment and forestry production as a collection road. 4 Border fire protection barriers can prevent foreign fire intrusion. In inaccessible places, fire protection barriers are like a guarding the Great Wall.