Research on characteristics of flammable material under Pinus sp forest canopy in vietnam

Abstract

Pinus spp. are a multi-purpose tree, providing resin and wood. In addition, pine forests also play an important role in protecting the ecological environment, increasing the beauty of natural landscapes, serving tourism and national security. Pine forests are prone to fire, when the fire spreads quickly and very difficult to be extinguished, causing great damage. In the period from 2015 to December 2020 alone, there have been 1,928 forest fires, with an area of 8,631 hectares, of which pine forest occupies the largest area when the fire spreads rapidly, which is difficult to extinguish due to the forest. Pine has a large volume of combustible material, difficult to decompose, in the combustible material, there is turpentine that is very easy to catch fire. The average amount of burning material under the canopy of Pinus spp. at I-V age level varies from 9.15 - 16.34 tons/ha, of which level IV has the largest volume at 16.34 tons/ha. The annual total volume of falling materials at the age of I - V varies from 1,924.2 - 5,420.7 kg/ha. Burning materials under the canopy of Pinus spp. at different age levels and different locations, the humidity varies, ranging from 16.5 to 41.1%. Pinus spp at I - V of age level has the average content of oil varying from 4.19 - 6.31%. The composition of cellulose in pine needles in the study sites ranged from 22.66% to 31.09% and the lignin content ranged from 31.82% to 38.85