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基于MODIS数据的内蒙古地形因子对火灾分布的影响分析

贾旭 高永 魏宝成 杨光 党晓宏 任昱 梁超

贾旭, 高永, 魏宝成, 杨光, 党晓宏, 任昱, 梁超. 基于MODIS数据的内蒙古地形因子对火灾分布的影响分析[J]. 北京林业大学学报, 2017, 39(5): 34-40. doi: 10.13332/j.1000-1522.20170006
引用本文: 贾旭, 高永, 魏宝成, 杨光, 党晓宏, 任昱, 梁超. 基于MODIS数据的内蒙古地形因子对火灾分布的影响分析[J]. 北京林业大学学报, 2017, 39(5): 34-40. doi: 10.13332/j.1000-1522.20170006
JIA Xu, GAO Yong, WEI Bao-cheng, YANG Guang, DANG Xiao-hong, REN Yu, LIANG Chao. Impact of topographic features on the distribution of fire based on MODIS data in Inner Mongolia, northern China[J]. Journal of Beijing Forestry University, 2017, 39(5): 34-40. doi: 10.13332/j.1000-1522.20170006
Citation: JIA Xu, GAO Yong, WEI Bao-cheng, YANG Guang, DANG Xiao-hong, REN Yu, LIANG Chao. Impact of topographic features on the distribution of fire based on MODIS data in Inner Mongolia, northern China[J]. Journal of Beijing Forestry University, 2017, 39(5): 34-40. doi: 10.13332/j.1000-1522.20170006

基于MODIS数据的内蒙古地形因子对火灾分布的影响分析

doi: 10.13332/j.1000-1522.20170006
基金项目: 内蒙古自治区林业厅项目“森林灾害风险区划及评估”
详细信息
    作者简介:

    贾旭。主要研究方向:自然灾害监测与防治。Email:jx84711230@126.com   地址:010018  内蒙古自治区呼和浩特市赛罕区鄂尔多斯东街29号沙漠治理学院

    责任作者:

    高永,博士,教授。主要研究方向:荒漠化防治。Email:13948815709@163.com   地址:同上

  • 中图分类号: S762.3+2

Impact of topographic features on the distribution of fire based on MODIS data in Inner Mongolia, northern China

  • 摘要: 了解火灾与地形因子的关系是深入研究火灾空间分布格局、火灾风险科学管理的重要前提。本研究基于MOD14A1/MYD14A1热异常产品数据集提取内蒙古2000—2015年的火点信息,结合研究区DEM数据,提取相关地形因子,并在此基础上分析区域尺度背景下的地形因子与火灾分布关系。结果表明:1)采用均值变点分析法,确定内蒙古地形起伏度的最佳统计单元为0.52 km2;2)火灾分布在地形因子的作用下表现出一定的地形梯度性。火点个数随高程的升高呈现先增大后减小的变化趋势,而火点个数随坡度和地形起伏度的增大呈现逐渐下降的趋势;3)火点分布最多的高程、坡度、地形起伏度区间分别为80~700 m、0°~7°、1~70 m,火灾多发生在高程低、地形平坦、起伏小的地区,这类区域一般人类活动频繁,为火灾的发生提供了机会;4)在火点分布最多的地形区间内,不同土地利用类型上的火点个数分布排序为草地>耕地>林地>其他类型。

     

  • 图  1  SSi差值变化曲线

    S代表总的样本离差平方和,Si代表分段样本离差平方和。

    Figure  1.  Change curve of difference between S and Si

    S and Si represent sum of squares of total sample deviation and sum of squares of partial sample deviation, respectively.

    图  2  研究区高程、坡度、地形起伏度分级图

    Figure  2.  Hierarchical map of elevation, slope degree and amplitude of landform in the study area

    图  3  单位高程上的火点个数

    Figure  3.  Number of firepots per elevation unit

    图  4  单位坡度上的火点个数

    Figure  4.  Number of firepots per slope degree unit

    图  5  单位地形起伏度上的火点个数

    Figure  5.  Number of firepots per unit amplitude of landform

    表  1  Fire Mask数据集属性值含义

    Table  1.   Specific content of 10 levels of fire mask

    属性值
    Attribute value
    对应具体含义
    Corresponding meaning
    0 未处理像元Unprocessed pixel
    1 未处理像元Unprocessed pixel
    2 未处理像元Unprocessed pixel
    3 水域Water pixel
    4 云Cloud
    5 没有火的裸地Non-fire bare land pixel
    6 未知像元Unknown pixel
    7 低置信检测火点Fire (low confidence, land or water)
    8 中置信检测火点Fire (middle confidence, land or water)
    9 高置信检测火点Fire (high confidence, land or water)
    下载: 导出CSV

    表  2  各地形因子级别区所占面积和比例

    Table  2.   Area and proportion of different topographic factor levels

    地形因子Topographic factor 1 2 3 4 5 6 7 8
    高程
    Elevation
    范围Range/m 80~300 300~500 500~700 700~900 900~1 100 1 100~1 300 1 300~1 500 >1 500
    面积Area/km2 65 448 77 403 118 107 124 043 240 489 196 732 219 958 101 045
    百分比Percentage/% 6 7 10 11 21 17 19 9
    坡度
    Slope degree
    范围Range/(°) 0~2 2~7 7~15 15~25 25~35 >35
    面积Area/km2 656 341 308 657 141 939 32 935 3 069 283
    百分比Percentage/% 57 27 12 3 0 0
    地形起伏度
    Amplitude of
    landform
    范围Range/m 1~30 30~70 70~200 200~500
    面积Area/km2 690 749 220 245 222 057 14 592
    百分比Percentage/% 60 19 19 1
    下载: 导出CSV

    表  3  火点个数在不同高程级别区的分布

    Table  3.   Distribution of firepots at different elevation levels

    项目Item 1 2 3 4 5 6 7 8
    高程值Elevation value/m 80~300 300~500 500~700 700~900 900~1 100 1 100~1 300 1 300~1 500 >1 500
    火点个数Number of firepot 1 993 2 972 2 316 1 797 1 197 935 593 199
    百分比Percentage/% 17 25 19 15 10 8 5 2
    下载: 导出CSV

    表  4  火点个数在不同坡度级别区的分布

    Table  4.   Distribution of firepots at different slope levels

    项目Item 1 2 3 4 5 6
    坡度值Slope degree value/(°) 0~2 2~7 7~15 15~25 25~35 >35
    火点个数Number of firepot 5 071 4 361 2 267 290 11 2
    百分比Percentage/% 42 36 19 2 0 0
    下载: 导出CSV

    表  5  火点个数在不同地形起伏度级别区的分布

    Table  5.   Distribution of firepots at different levels of amplitude of landform

    项目Item 1 2 3 4
    地形起伏度值Amplitude value of landform/m 1~30 30~70 70~200 >200
    火点个数Number of firepot 4 780 3 602 3 528 92
    百分比Percentage/% 40 30 29 1
    下载: 导出CSV
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  • 收稿日期:  2017-01-06
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