大兴安岭地区森林雷击火发生的时空分布

Spatiotemporal distribution of lightning-caused forest fires in Daxinganling area

森林火灾是森林植被区最为重要的扰动因子,而雷击火是森林火灾的重要组成部分。大兴安岭地区频繁的森林火灾己成为当地经济发展的沉重压力和巨大威胁。利用地理信息技术、SPSS统计软件和m atlab等工具,分析了1966-2006年黑龙江省大兴安岭地区森林雷击火发生的时空演变规律。结果表明:上述41年间,该地区共发生森林雷击火560起,6月份是雷击火的高发期,而一天中15,16时又是雷击火的高发时段,且雷击火的发生存在着24 a的显著周期震荡和12 a,2 a的次显著周期震荡。同时,雷击火火场质心呈显著的带状分布,并有向东南偏移的趋势。此项研究可为大兴安岭林区科学有效地开展森林防火工作提供参考。

Forest fire is the most important disturbance factor in forest vegetation regions,and lightning-caused forest fires is an important component of it.Frequent lightning-caused forest fires had become a strong pressure and a great menace of the local economic development.With GIS technique,SPSS statistics software,and matlab,Spatiotemporal distribution of lightning-caused forest fires in Daxinganling,Heilongjiang Province,between 1966 and 2006 was analyzed.The results show that from 1966 to 2006,the region experienced 560 lightning-caused forest fires.The peak period occurs in June of a year,and 15-16 O＇clock is highty occurring time interval,24a period is displayed obviously,and 12a,2a periods are also relatively clear.Meanwhile,the centroid of fire scenes showes band-shaped and has a trend of migration southeastward.This study can gives a theoretical reference to the work of forest fire prevention.