滇中地区云南松纯林计划烧除研究

摘要

通过外业调查,在试验林区设置样地、样方,采集可燃物,分析了滇中地区新平县云南松纯林的可燃物特征.在实验样地内实施了计划烧除,观测了实际火烧中的火焰高度、温度和热辐射等火行为参数,并在实验室内进行了小尺度火行为模拟.结果表明:以草类为主的云南松纯林,无论是实地计划烧除还是实验室室内火烧模拟,火焰高度都在50 cm以下,但温度较高,接近600 ℃,热辐射低于8 kW/m2,火强度在405 kW/m以下,烧除率为60%左右,属于低强度火烧,难以形成树冠火,云南松纯林计划烧除间隔期应为3年左右.%By filed surveying,plots were set and samples were collected,and the fuel characteristics of pure forest of Pinus yunnanensis Franch in central Yunnan Province were analyzed.From not only prescribed burning,but also,modified fire,the index of fire behaviors,especially,flame height,temperature,and thermal radiation were observed and recorded.Using fuels collected from filed,small scale fire including upslope and downhill fires were modified in the laboratory.Both results showed,grass as dominated fuels in pure forest of Pi-nus yunnanensis Franch,its fire was of low intensity due to weak flame height,which was below 50 cm,its ther-mal radiation was under 8 Kw/m2,its fire intention was below 405 kw/m,but its flame temperature was high, which was near 600 ℃.It's difficult for surface fire to transfer to grown fire.The best interval of prescribed burning in pure forest of Pinus yunnanensis Franch in central Yunnan Province is 3 years.