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在大兴安岭森林火灾后7年冻土环境区选择不同程度火烧区(重度火烧区、轻度火烧区)与非过火区来对比分析冻土温湿度因子的变化。研究得出在整个生长季里火烧区的大气温度在重度火烧区与轻度火烧区分别比非过火区大3.53℃、17℃;大气相对湿度在重度火烧区与轻度火烧区分别比非过火区小13.06%、9.3%;土壤表面、5cm、10cm、20cm的温度在重度火烧区与轻度火烧区分别比非过火区大5.38℃、3.7℃、2.66℃、2.3℃、1.8℃、1.16℃、1.18℃、0.64℃;土壤5cm、10cm的含水率在重度火烧区与轻度火烧区分别比非过火区大1.84%、3.32%、3.76%、9.4%。研究森林火灾后冻土温湿度因子的变化规律可对以后火烧区的植被恢复提供气象依据。
The changes of temperature and humidity factors of frozen soil were compared and analyzed by selecting different degrees of fire area (severe fire area, mild fire area) and non-overfire area in the frozen soil environment zone after 7 years of forest fire in Daxing’anling. The results showed that the atmospheric temperature in the burning zone was 3.53 ℃ and 17 ℃ higher than those in the non-overheating zone respectively in the whole growing season. The relative humidity of the atmosphere was higher in the severe and lighter areas than in the non-overheating area 13.06% and 9.3% respectively. The temperature of soil surface, 5cm, 10cm and 20cm were 5.38 ℃, 3.7 ℃, 2.66 ℃, 2.3 ℃, 1.8 ℃ and 1.16 ℃ respectively in the severe fire area and the mild fire area , 1.18 ℃ and 0.64 ℃ respectively. The moisture content of soil 5 cm and 10 cm was 1.84%, 3.32%, 3.76% and 9.4% larger than that of non-over-fire zone respectively. Studying the variation law of the temperature and humidity of frozen soil after forest fire can provide meteorological evidence for the vegetation restoration in the future fire area.