调查马尾松林中虫害发生区与无虫害发生区不同时滞的地表死可燃物,室内测定含水率,研究不同时滞地表死可燃物的可燃物载量。结果表明：松毛虫会造成马尾松林当年枯枝落叶等可燃物载量增加,对1h时滞死可燃物载量影响最大,增加174.7%；对10h时滞可燃物载量影响其次,增加113.5%,与未发生虫害林区相比,可燃物载量差异显著([WTBX]p[WTBZ]<0.05)。经过一定林分恢复期后,可燃物载量趋于平衡,发生过虫害的林区,1h时滞死可燃物载量比未发生林区增加量为41.6%,10h时滞死可燃物载量增加量为16.7%,可燃物差异均不显著([WTBX]p[WTBZ]>0.05)。因此,虫害爆发可以通过影响森林地表可燃物载量,从而增加森林火灾发生风险。
The surface dead fuels of different time-lag were investigated in pest occurrence area and healthy area of Pinus massoniana forest.Moisture content was tested in the lab.The different time-lag of fuel loadswere analyzed.Pine moth increased the loads of surface dead fuel in Pinus massoniana forest.1h dead fuel and 10h dead fuel were increased by 174.7% and 113.5%,respectively.There is significant difference between pest occurrence area and healthy area of Pinus massoniana(p<0.05).The fuel load tends to balance after stand recovery period.1h dead fuel load and 10h dead fuel were increased by 41.6% and 16.7%.And there is no significant difference between pest occurrence area and healthy area of Pinus massoniana(p>0.05) forest.Therefore,insect outbreak can affect fire risk based on the surface dead fuel.
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