大兴安岭北部地区原始林火干扰历史的研究

在大兴安岭阿龙山林业局的一个集水区，通过样地法（９６个样地），调查了大量的火疤木，研究了景观水平上的火状况。结果表明，由１８２５至１９９３年间样区共发生１４次火灾，火烧种类主要是地表火，但也有少量树冠火；火烧强度主要为弱度火；火场面积通常很大；火烧平均间隔期为３７ａ，火烧轮回期的约３０ａ。这些指标对大于大兴安岭北部林区有一定的代表意义。大兴安岭北部林区的火状况主要决定于兴安落叶松的抗火特性和森林群

FIRE DISTURBANCE HISTORY IN VIRGIN FOREST IN NORTHERN REGION OF DAXINGANLING MOUNTAINS

The fire disturbance regime at landscape scale in a watershed of Alongshan forest farm in northern parts of Daxinganling Mts.was studied through investigating a large number of fire scar tree in 96 sample plots.The most common fire type was surface fire and fire area usually large.The mean fire interval was about 37 years and fire rotation period was about 30 years.All these fire disturbance regimes were due to the fire resistence of Larix gmelinii and the constructure character of this community.There were different fire disturbance regime among different forest compartment,forest stand and forest type of Larix gmelinii . Fire occurance was more frequent and fire intensity was lighter in drier sites.Stream in forest always circumscribed the fire spread in most case.