基于landsat影像大兴安岭地区林火烈度时空格局分析
收稿日期: 2019-09-23
修回日期: 2019-10-23
网络出版日期: 2020-05-09
基金资助
沈阳市科技计划项目(F16-158-9-00);长白山科学研究院开放基金项目(201806);国家自然基金面上项目(31770665);国家自然基金青年科学基金项目(41301200);国家自然基金青年科学基金项目(41201185)
Analysis on Temporal and Spatial Patterns of Forest Fire Intensity in the Greater Xing'an Mountains Based on Landsat Images
Received date: 2019-09-23
Revised date: 2019-10-23
Online published: 2020-05-09
基于大兴安岭地区1988—2009年landsat5 TM数据和地面火烧记录信息,在Envi5.3平台下获得大兴安岭地区多年连续火斑数据,提取火斑数据 dNBR 指数。结果表明:1988—2009年大兴安岭地区林火发生次数和过火面积均呈现上升趋势;在1998年天保工程实施之前,大兴安岭地区林火以低烈度火为主,1998年之后低烈度过火面积比率呈现显著下降趋势(P<0.05);1998年之后高烈度过火面积比率呈现显著上升趋势(P<0.01)。月均最高气温与高烈度火占比呈现显著的正相关关系(P<0.05),与低烈度火呈现显著的负相关关系(P<0.05);月平均风速与高烈度火呈现显著的负相关(P<0.05),与低烈度火呈现显著的正相关(P<0.05)。通过对比分析天保工程实施前后林火特征和气候的变化趋势,可以发现天保工程的实施对林火烈度产生极大的影响,是其改变的主要原因。
袁昊 , 陈宏伟 , 齐麟 , 房磊 , 乔泽宇 , 赵福强 . 基于landsat影像大兴安岭地区林火烈度时空格局分析[J]. 林草资源研究, 2019 , 0(6) : 91 -96 . DOI: 10.13466/j.cnki.lyzygl.2019.06.016
Based on the landsat5 TM data and local fire record information of the Greater Xing'an mountains from 1988 to 2009,the continuous fire spot data were obtained under the envi5.3 platform,and the dNBR index of fire spot data was established.The results showed that the number of forest fires and over-fire area in the Greater Xing'an mountains area increased from 1988 to 2009.Before the implementation of the Natural Forest Protection Project(NFPP) in 1998,the forest fires in the area were primarily low-intensity fires.After 1998,however,the ratio of low-intensity fires decreased significantly(P<0.05) while the high intensity fires increased significantly(P<0.01).The mean maximum temperature was positively correlated with high severity fire(P<0.05) but significant negative correlation with low intensity fire(P<0.05),monthly mean wind speed and high intensity fire showed a significant negative correlation,(P<0.05),there was a significant positive correlation with low intensity fire(P<0.05).From the results of this research we speculated that the implementation of the NFPP is the main driving force of the changed of fire severity.
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