马尾松群落防火林带有效宽度模型研究

Effective Width Model of Fire-preventing Forest Belts for Pinus massoniana

马尾松是我国南方造林绿化的先锋树种，由于马尾松群落结构单一，林内干燥，可燃物载量大，是森林火灾多发群落，而其防火林带建设特别是防火林带的有效宽度指标却没有具体的技术参数标准，为此，选择有代表性的马尾松群落，利用两次火烧试验结果，引入影响林火蔓延的坡度因子和风速因子，建立了以马尾松木荷防火林带的有效宽度模型，模拟结果表明：在南方低山丘陵区（坡度20°-30°，风级2-4级），可营造行距3米的木荷防火林带4-5行，同时提供了相应坡度与风级条件下，木荷防火林带有效宽度的技术参数标准。

Pinus massoniana is the pioneer afforesting species in Southern China. Forest fire often occurs in P. massoniana stand due to its simple communtity structure, dry atmosphere within the stand and large amount of the bearing of forest fuels. It is valuable to establish the effectire width of forest belts for firepreventing. A model of effective width forest belts for fire-preventing was established based on the two forest fire experiments in the typical P. rnassoniana stands. Factors effecting the spreading of forest fire, such as slope degree, wind speed were introduced in the model. The results showed that four or five line belts with 3 meter row width was enough for forest fire prevention at the conditions of 20°-30°slope and 2-4 grade wind. Furthermore, the stimulant table was attained at the corresponding special conditions.