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比较了大兴安岭地区的偃松落叶松原始林和2种不同火烧程度森林类型(轻度火烧林、重度火烧林)之间粗木质残体(Coarse Woody Debris,CWD)组成的差异。结果表明:原始林、轻度火烧林、重度火烧林的CWD蓄积分别为59.92m3/hm2,199.77m3/hm2,217.73m3/hm2,原始林和火烧林之间CWD材积之间有差异,而2种火烧林之间没有差异,说明火灾干扰改变了偃松落叶松林的CWD的组成结构,但是不同的火烧程度对森林CWD的影响程度差不多。原始林和重度火烧林CWD径级大部分为2～20cm,其中立枯木、倒木和伐桩分别占各自总蓄积量的34%,64%,2%和94%,5%,1%,轻度火烧林CWD大部分径级2～10cm,其中立枯木、倒木和伐桩分别占总蓄积量的47%,50%,3%,由此可看出3种不同林型的CWD都集中在小径级的立枯木和倒木中,即小径级的立枯木和倒木是3种林分CWD的主要来源。火烧后偃松落叶松林的蓄积量增加明显,因此可认为火烧可以增加森林CWD的输入量。
The differences of the composition of Coarse Woody Debris (CWD) between the native forests of Larix olgensis Larix sibiricus and the two types of forest with different degrees of fire (mild fire and heavy fire) were compared. The results showed that the CWD volume of primary forest, mild forest and severe forest were 59.92m3 / hm2, 199.77m3 / hm2 and 217.73m3 / hm2, respectively. There is no difference between the firewood species, indicating that fire disturbance changed the composition of the CWD in the Larix olgensis forest, but the degree of fire affected the CWD of the forest to a similar extent. The CWD diameter classes of the primary forest and the heavy fire forest are mostly 2 ~ 20cm, of which the percentage of standing dead wood, fallen wood and stumps respectively accounts for 34%, 64%, 2% and 94%, 5%, 1% Most CWD logs of firewood forest were 2 ~ 10cm in diameter, of which the standing logs, downcast logs and stumps accounted for 47%, 50% and 3% of the total stock respectively. It can be seen that the CWDs of 3 different forest types were concentrated in Small-diameter standing and dead wood, that is, small-diameter standing and dead wood is the main source of CWD for three stands. After burning, the volume of Larix gmelinii forest increased obviously, so the fire could increase the input of forest CWD.