森林火灾对森林的危害很大。北方的冬、春季，正值干旱少雨之际，树木处于休眠期，体内水分含量少，而草本植物的茎则全部枯死，十分干燥。这时的林区，到处草干物燥，遇有火星，非常容易起火蔓延。据统计，北京市的森林火灾，99％以上发生在冬春两季。为此，《北京市森林资源 Forest fires are devastating for forests. Northern winter and spring, at a time of drought, the trees in dormancy, the body less water content, while the stems of herbs are all dead, very dry. At this time of the forest, everywhere dry and dry, in case of Mars, very easy to spread the fire. According to statistics, more than 99% of forest fires in Beijing occur in winter and spring. To this end, "Beijing’s forest resources