大兴安岭火烧迹地湿地与森林水文功能变化

选取位于主要过火区的图强林业局育英和奋斗两林场作为研究区，基于野外试验以及林相图、卫片等数据，利用地理信息系统软件，对1987年特大森林火灾后的湿地格局变化以及森林水文功能恢复状况、冻土活动层的变化进行了研究。结果显示，湿地面积有所增加，且分布趋于集中；森林的平均水文调节能力已得到全面恢复，但调节能力分布不均；火烧区冻土活动层的厚度显著高于未火烧区。在森林水文调节功能下降的地区、地势较低的谷地，坡度平缓的坡地以及冻土活动层增加的地区，湿地面积明显增加。

Change of wetland pattern and regulating capacity of forest hydrology in burned area of northern great Hingan mountains

Hydrological condition and terrain are the key factors to generate the wetland,besides permafrost.The Yuying and Fendou farms are located in Tuqiang forestry bureau,which is one of the mainly burned area in 1987 fire,were selected as the study area to reveal the wetland pattern change after 1987 catastrophic fire,the restoration of regulating capacity of forest hydrology post-fire and the change of permafrost active layer,using GIS software.The results show that the total area of wetland increased obviously with convergence tendency compared to that of pre-fire;the average regulating capacity of forest hydrology has already restored,but the area of high regulating capacity of forest hydrology decreased,and the permafrost active layer in the burned area is thicker than that in unburned area.Regulating capacity of forest hydrology,terrain factors and permafrost active layer related to the wetland pattern change.The increase of wetland was remarkable in valley,gentle slope and the area with thick permafrost active layer,and also in area of regulating capacity of forest hydrology decreasing.