摘要
火因子是森林生态系统重要的干扰因子,对森林生态系统的结构和功能具有重要影响。定量评价不同强度火干扰下森林可燃物载量的影响对于理解火因子在生态系统中的作用具有重要意义。选择2006年松岭大火火烧迹地,通过野外调查和室内数据分析相结合的方法定量研究不同强度火烧干扰后兴安落叶松林可燃物载量的变化。结果表明:兴安落叶松林在轻度、中度和重度火干扰后森林可燃物载量分别减少了25.10%、38.67%和54.67%。其中,在轻度、中度和重度火干扰后兴安落叶松林灌木层可燃物消耗量分别为0.58t/hm2、0.69t/hm2和0.44t/hm2;乔木层可燃物分别减少了18.24t/hm2、28.24t/hm2和40.01t/hm2;1h时滞可燃物分别减少0.33t/hm2、0.22t/hm2和0.46t/hm2;在轻度和重度火干扰后兴安落叶松林10h时滞可燃物分别增加了0.14t/hm2和0.15t/hm2,中度火干扰后减少了0.04t/hm2;100h时滞可燃物在轻度、中度和重度火干扰后分别增加了0.56t/hm2、0.37t/hm2和0.99t/hm2。重度火干扰对林地可燃物载量影响最大,轻度火干扰影响最小,中度火干扰介于两者之间。
Forest fire as an important disturbance factor of forest ecological systems has important influence on the structure and function of forest ecosystem.Quantitative evaluation of the changes of forest fuel load under the disturbance of different fire intensities is of great significance in understanding the fire factors in ecological system.The burned areas in the interference of a big fire in 2006,in Songling,was selected as the experimental site.The changes of forest fuel load under the disturbance of different fire intensities were quantitatively studied by field investigation and data analysis.Results indicate that fuel load in Larix gmelinii in the interference of mild fire,moderate fire and serious fire decreased by 25.10%,38.67% and 54.67%,respectively.Among them,the fuel consumption of tree layer were 18.24t/hm2,28.24t/hm2 and 40.01t/hm2,the fuel consumption of shrub layer were 0.58t/hm2,0.69t/ hm2 and 0.44t/hm2,the 1-hour dead fuels consumption were 0.33t/hm2,0.22t/hm2 and 0.46t/hm2,respectively.10-hour dead fuels load increased 0.14t/hm2and 0.15t/hm2 in the mild and serious fire,but decreased 0.04t/hm2 in the moderate fire.100-hour dead fuels load increased 0.56t/hm2,0.37t/hm2 and 0.99t/hm2 in the mild,moderate and serious fire,respectively.Serious fire has the most significant impact on the fuel load,while mild fire has less impact on it.
出处
《森林工程》
2013年第5期24-28,共5页
Forest Engineering
基金
国家级大学生科技创新项目(201210225011)
