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大面积(≥100公顷)森林火灾的发生具有地域性、季节性特点,并且随着气候条件的改变还具有时间性特点,即在长的气候序列中有多发生年和少发生年的区别。气侯因子对大面积森林火灾的发生与蔓延具有决定性作用。尽管森林火灾的发生原因有天然因素和人为因素两种,但在人为因素导致的森林火灾中,气侯因子的作用也不可低估。据统计全世界37亿公顷森林地带中每年发生的森林火灾可达20万起。在森林火灾中天然雷电起火的每年约2万起,人为森林火灾每年约18万起。由于森林火灾的发生必定受气侯背景和气象条件的制约。因此注意对气候背景的分析研究,重视对气侯条件的监
The occurrence of forest fires in large areas (≥100 hectares) has the characteristics of regional and seasonal characteristics, and also has the temporal characteristic as the climatic conditions change, that is, how long the difference between years and few years occurs in long climatic series. Climate factors have a decisive effect on the occurrence and spread of large-scale forest fires. Although there are natural and man-made factors in forest fires, the role of climate factors in man-made forest fires can not be underestimated. According to statistics, there are up to 200,000 forest fires occurring each year in the 3.7 billion hectares of forestlands in the world. There are about 20,000 natural lightning fires in forest fires and about 180,000 man-made forest fires each year. Due to the occurrence of forest fires must be constrained by climate background and meteorological conditions. Therefore, pay attention to the analysis of the climatic background, focusing on the monitoring of climate conditions