南宁老虎岭马尾松林间伐前后的火行为

Fire Behavior of Pinus massoniana Forest Pre-thinning and Post-thinning in Tiger Mountain,Nanning

以南宁老虎岭马尾松生态公益林为例，应用BehavePlus5．0分析了间伐前后3块不同样地的火行为。结果表明：间伐处理使地表火面强度降低28％～50％，地表火反应强度降低22％～45％，树冠火火线强度降低48％～59％，大幅降低了地表火向树冠火的转化率；在间伐后干旱夏季的12种情景中，仍然有10种情景的火线强度超过手工工具扑灭范围，1种情景下火线强度超出人类使用所有机械能够控制的极限。

With 31-year Pinus massoniana non-commercial forest in Tiger Mountain, Nanning, we studied their fire behavior of three sampled plots by BehavePlus 5.0. The thinning significantly reduced the transition rate to crown fire. The disposal of shrub, dead branches contributed to a reduction by 28%-50% in heat per unit area, a decrease by 22%-45% in reaction intensity, and a fall of 48%-59% in crown fireline intensity. Among 12 post-treatment summer drought scenarios, 10 still had fireline intensities exceeding the control by hand tools, and 1 had intensity overrunning all mechanical controls.