摘要
在海寨林场针叶林内设置样地,开展外业调查,采集地表凋落物并进行室内燃烧模拟和实验室理化性质分析,采用SPSS 26.0 软件分析数据,探究海寨林场针叶林地表可燃物的特征及潜在火行为.杉木的绝对含水率为(9.40±0.65)％,热值最低为(19 878.9±48.63)kJ/kg,并且杉木的火强度和蔓延速度最小,分别为(259.64±19.73)kW/m和(0.33±0.14)m/min,所以杉木的燃烧性最差;云南松纯林可燃物载量为(0.27±0.12)kg/m2,热 值 为(21 390.88±73.39)kJ/kg,火 强 度 较 低,为(307.26±15.83)kW/m,实际烧损率仅为(55.32±15.02)％,云南松的热值最大,容易引燃,但载量太低,无法维持正常燃烧;华山松纯林的热值低于云南松,且火强度和烧损率低于云南松-华山松混交林;云南松-华山松混交林的蔓延速度和火强度为(0.82±0.31)m/min和(564.14±13.53)kW/m,远高于其他 3种,潜在火灾风险等级最高.由上述潜在火行为可知,海寨林场4种针叶林引发火灾的风险等级由高到低依次为云南松-华山松混交林、华山松纯林、云南松纯林和杉木.
Abstract
Sample plots were set up within the coniferous forests of Haizhai forestry,field surveys were conducted,surface litter was collected,and indoor combustion simulations and laboratory physical and chemical property analyses were performed,and SPSS 26.0 software was used to analyze the data to explore the characteristics of surface combustibles and potential fire behavior of the coniferous forests in Haizhai Forestry.Lanceolata had the worst combustibility as it had an absolute moisture content of(9.4±0.65)％and the lowest calorific value(19 878.9±48.63)kJ/kg,and also had the smallest fire intensity and rate of spread of(259.64±19.73)kW/m and(0.33±0.14)m/min,respectively.
基金项目
国家自然科学基金(32160376)
国家自然科学基金(31960318)
云南省教育厅研究生科学研究项目(2023Y0778)
维普
万方数据