为评价内蒙古毕拉河林场2017年5月2日发生的森林火灾损失情况,利用火灾发生前后的Landsat8卫星影像,计算得到两者间的差值归一化燃烧指数(dNBR),通过目视解译和数学统计相结合的方法构建森林火灾受害程度分级评价指标,对该火烧迹地受灾程度进行定量评价,并利用实地测量GPS数据和GF-2卫星数据验证受害程度的分级精度为86.39%。研究结果表明:内蒙古毕拉河林场火烧迹地的中度受害区域面积最大,为4 685.09hm²,占火烧迹地总面积的40.35%;轻度受害面积次之,为4 213.1hm²,占火烧迹地总面积的36.28%;重度受害面积为1 031.03hm²,占总面积的8.88%;未受害区域的面积最小为906.57hm²,占火烧迹地总面积的7.81%;火烧迹地内的受灾森林主要分布在中度受害区域和轻度受害区域,受灾草地主要分布在轻度受害区域。

In order to evaluate the forest fire loss occurred on May 2,2017 in Bilahe Forest Form in Inner Mongolia,the Landsat8 satellite images which were pictured pro and post the fire were selected as the study data,the difference Normalized Burn Ratio(dNBR) was calculated by means of the two images.Through the combination of visual interpretation and mathematical statistics,the fire severity evaluation index was constructed.The damage of forest fire in Bilahe forest was quantitatively evaluated.By using the field survey GPS data and GF-2 satellite data to verify the damage degree of the forest fire,the grading accuracy was 86.39%.The results show that the moderate damage area is the largest in Bilahe Forest Farm in Inner Mongonlia,which is 4 685.09 hm²,accounting for 40.35% of the total burned area,followed by low damage area of 4 213.1hm²,accounting for 36.28% of the total burned area,high damage area is 1 031.03hm²,accounting for 8.88% of the total burned area,and the unburned damage area is 906.57hm²,accounting for 7.81% of the total burned area.The affected forest of the typical vegetation is mainly distributed in the moderate damage and low damage area.The affected grassland is mainly distributed in the low damage area.