中文摘要：

根据大兴安岭呼中林区1969—2005年的林火统计资料,利用SPSS统计软件和ArcGIS地理信息系统软件,揭示了呼中林区林火发生的时空分布特征。结果表明：1969—2005年间呼中林区林火发生年际间波动较大,1998年以来林火发生次数呈明显的上升趋势;呼中林区林火主要发生在春季和夏季,特别是5月和6月的林火发生最为严重;1 d内林火发生大概可分为4个阶段,其中以15：00左右最为严重。从林火发生的空间分布来看,林火主要发生在呼中林区的东北方向,以碧水和提扬山林场为最多;林火发生次数随距离道路和河流变远而呈减少趋势;林火主要发生在海拔600～900 m之间,坡度主要为0°～10°,且阳坡过火面积明显大于阴坡。

英文摘要：

The spatial and temporal distribution characteristics of forest fires in huzhong forest area of Great Xing＇an Mountain were analyzed using statistic analysis and GIS spatial analysis methods based on data of forest fire records from 1969 to 2005.Results indicated that the annual forest fires varied significantly from 1969 to 2005,and showed an evident upward trend since 1998.Forest fires mainly occurred in spring and summer,especially from May to June.The daily patterns of forest fires roughly divided into four stages,and the most serious stage was around at 15：00.The spatial distribution patterns of forest fires were obvious.Most forest fires lie in northeastern Huzhong forest area,especially in Bishui and Tiyangshan forest farms;The farther from the road and river,the less forest fires occurred;Most forest fires occurred at altitude ranging from 600 m to 900 m with slope from 0° to 10°.The total burned area on sunny slopes was significantly larger than that on shady slopes.