【摘要】 据吉林省１９６９～１９９６年３０００多林火个例，就生产性火源和非生产性火源以及非生产性火源中的吸烟火源作了统计分析，结果是：①各种火源的日变为“单波型”；年变为“双波型”．②延边州和白城地区的非生产性火源所占比例最大，吸烟火源则以延边州和长春四平辽源地区的比例最大．③针阔混交林和针叶混交林发生各种火源的频率最小；柞树林的生产性火源频率最大；阔叶林的非生产性火源最集中；吸烟火源集中于柞树林和落叶松林，其比例分布与各地的柞树林和落叶松林的分布比例成正比关系．④林分的疏密度在０．５以下，各种火源的出现频率较大；０．５以上随疏密度的增大而频率减少．⑤林龄与各种火源发生频率有明显的关系更多还原

【Abstract】 According to over 3000 sigle examples of forest fire from 1969 to 1996 in Jilin Province,productive fire origin,inproductive fire origin and smoking fire origin were made statistics analysis,results showed:①Daily change is “dublewavetype”.②Inproductive fire origins forcus in Yanbian and Baicheng,smoking fire origins forcus in Yanbian,Changchun and Liaoyuan.③Fire origin occurring frequency in mixed and conilignosa is lowest;Productive fire origin frequency of oak forest is maximum;Productive fire origin frequency of hardwood is the most concentrative;Smoking fire origin concentrates in oak and larch and their distribution scale are direct proportion with the others.④Density of forest type blows 0.5,occurring frequency of all kinds are also more over 0.5,its frequency are inverse proportion with density.⑤Fire origin occurring frequency is relative to forest age.更多还原