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根据大量统计，森林火灾发生的环境（白天）温度指标为0～25℃。据此我们统计了全省各地春秋两季森林防火期的开始、终止和历时（天）的地理分布。结果表明：①春季森林防火始期平均为3月9日，终期平均为6月20日，平均历时为100d；长白山林区始期和终期都较晚，中西部和延边东部始期和终期都大于全省平均。②秋季森林防火始期平均为9月11日，终期平均11月19日，平均历时68d；长白山林区秋防始期和终期都早于东部和中西部地区，形成以128°E为轴心，始期、终期最早，向两侧逐渐推迟的分布形势。③春季森林防火期历时明显大于秋季，春季各地防火始期的早晚与该地贴地层1m高处的空气湍流系数K（1）有明显的相关关系。
According to a large number of statistics, the environmental (daytime) temperature index of forest fires is 0 ~ 25 ℃. Based on this, we have calculated the geographical distribution of the beginning, end and duration (days) of the forest fire prevention period in the spring and autumn throughout the province. The results showed as follows: ①The average initial period of forest fire prevention in spring was March 9, and the average of the last period was June 20, the average duration was 100 days. The initial and final periods of Changbai Mountain forest area were later. Greater than the province average. ② The average initial time of autumn forest fire prevention was on September 11, and the average of the final forest life on November 19 was 68 days. The initial and final autumn defensive phases of Changbai Mountain forest area were earlier than the eastern and central-western regions, forming an axis with 128 ° E , The beginning, the earliest, the gradual delaying of the distribution of the situation on both sides. (3) The duration of fire prevention period in spring forest was obviously longer than that in autumn, and the early and late fire prevention period in spring had a clear correlation with the air turbulence coefficient K (1) at 1m height of the stratum.