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林业科学 ›› 2026, Vol. 62 ›› Issue (6): 56-70.doi: 10.11707/j.1001-7488.LYKX20250583

• 研究论文 • 上一篇    下一篇

大兴安岭雷击火时空聚集性及其驱动因素

高博洋1,徐健楠2,李伟克3,王明玉3,宁吉彬1,杨光1,*()   

  1. 1. 东北林业大学林学院 哈尔滨 150040
    2. 国家林业和草原局林草调查规划院 北京 100714
    3. 中国林业科学研究院森林生态环境与自然保护研究所 北京 100091
  • 收稿日期:2025-09-22 修回日期:2026-02-12 出版日期:2026-06-10 发布日期:2026-06-13
  • 通讯作者: 杨光 E-mail:yangguang@nefu.edu.cn
  • 基金资助:
    国家林业和草原局林草科技创新发展研究项目(2023132032);中国博士后科学基金(2025T180545)。

Spatiotemporal Clustering of Lightning-Ignited Forest Fires in Daxing’ anling Mountains and Itʼs Driving Factors

Boyang Gao1,Jiannan Xu2,Weike Li3,Mingyu Wang3,Jibin Ning1,Guang Yang1,*()   

  1. 1. College of Forestry, Northeast Forestry University Harbin 150040
    2. Academy of Forestry Inventory and Planning, National Forestry and Grassland Administration Beijing 100714
    3. Ecology and Nature Conservation Institute, Chinese Academy of Forestry Beijing 100091
  • Received:2025-09-22 Revised:2026-02-12 Online:2026-06-10 Published:2026-06-13
  • Contact: Guang Yang E-mail:yangguang@nefu.edu.cn

摘要:

目的: 全球气候变暖、极端天气频发,导致雷击火灾的规模更大、强度更高、破坏性更强。探究大兴安岭雷击火灾的时空分布及聚集性演变规律,并识别其关键驱动因素,为雷击火灾的防控和管理提供科学依据。方法: 基于2013—2024年大兴安岭雷击火灾历史数据,综合运用统计分析、二维高斯核密度分析、地理探测器等方法,分析雷击火灾的动态演化规律、空间聚集特征及关键驱动因素的解释力。结果: 1) 12年间共发生雷击火灾791次,2019年达到峰值。雷击火灾主要集中在4—10月,尤其是春季防火期和夏季生长期,最早记录为4月24日,最晚为9月19日。春季防火期结束后雷击火灾数量回落,但于7月中旬再次达到高峰。每日13:00—17:00(不含 17:00 时刻)为雷击火灾的高发时段,占总发生次数的50%以上。2) 12年间雷击火灾整体在研究区西北部呈明显聚集。逐年分析显示,聚集区呈现年度差异。采用自然断裂法将雷击火灾核密度值划分为5个风险等级,南部地区通常为极低风险区域(仅2022年出现少量雷击火灾)。Getis-Ord Gi*显著性检验显示,极高风险区具有稳定的空间聚集特征。3) 前3日平均气温、月最高气温、海拔、月平均气温、0~7 cm土层土壤湿度和归一化植被指数是各年份中解释力最强的核心驱动因素。相对湿度和月平均气温(较高解释力出现次数9次)、海拔和归一化植被指数(7次)等组合在历年数据中解释力普遍较强,表明其对雷击火灾的发生影响较为显著。此外,月平均气温、月最高气温和海拔与其他驱动因素的组合亦具有较高解释力。结论: 近年来大兴安岭雷击火灾发生整体呈波动趋势,建议在夏季(特别是午后14:00时左右)加强对重点林区的防范。12年间雷击火灾在乌玛、永安山、图强和阿木尔地区持续呈显著聚集特征,部分年份(2015和2018年)雷击火灾事件分布较散,呈随机分布特征,无显著聚集。不同类型因子的交互作用存在差异,其中气象因子之间的交互效应较为明显,在雷击火灾的发生机制中占据主导作用。本研究揭示了雷击火灾的时空演化规律及关键驱动机制,为防火决策的精细化和区域化管理提供了科学依据。

关键词: 雷击火灾, 驱动因素, 二维高斯核密度, 地理探测器, 大兴安岭

Abstract:

Objective: Global warming and the increasing frequency of extreme weather events have resulted in lightning-ignited forest fires with larger scale, higher intensity, and stronger destructiveness. This study investigates the spatiotemporal distribution and clustering evolution of lightning-ignited forest fires in the Daxing’anling Mountains, so as to provide a scientific basis for the prevention and management of lightning-ignited forest fires. Method: Based on historical records of lightning-ignited forest fires in the Daxing’ anling Mountains from 2013 to 2024, this study comprehensively applied statistical analysis, two-dimensional Gaussian kernel density analysis, and the geographical detector method to analyze the dynamic evolution patterns, spatial clustering characteristics, and explanatory power of key driving factors. Result: 1) A total of 791 lightning-ignited forest fires occurred during the past 12-year period, showing an overall fluctuating trend with a peak occurring in 2019. These fires were mainly concentrated between April and October, particularly during the spring fire prevention period and the summer growing season, with the earliest event on April 24 and the latest one on September 19. After the spring fire prevention period, the number of fires declined but rose again to a peak in mid-July. The period from 13:00 to 17:00 (excluding 17:00) was the high-incidence time, accounting for more than 50% of the events. 2) Spatially, lightning-ignited forest fires were significantly clustered in the northwestern of study area. Annual analysis revealed interannual variations in cluster locations. Using the natural breaks method, kernel density values were classified into five risk levels, with the southern region generally identified as very low-risk zones (only a few events occurred in 2022). The Getis-Ord Gi* significance test confirmed that high-risk areas had stable spatial clustering characteristics. 3) The three-day mean temperature before a lightning-ignited fire, monthly maximum temperature, elevation, monthly mean temperature, 0?7 cm soil layer soil moisture, and normalized difference vegetation index (NDVI) were identified as the core driving factors with the strongest explanatory power across different years. Combinations such as relative air humidity and monthly mean temperature (which showed higher explanatory power nine times), as well as elevation and NDVI (seven times), generally exhibited strong explanatory power across the years, indicating that they have a significant influence on the occurrence of lightning-ignited fires. Moreover, the combinations of monthly mean temperature, monthly maximum temperature, and elevation with other factors also demonstrated high explanatory power. Conclusion: This study summarizes the recent occurrence trends and characteristics of lightning-ignited fires in Daxing’anling Mountains, which show overall fluctuating patterns over time. It is recommended to strengthen fire prevention efforts in summer in key forest areas, particularly around 14:00. Lightning-ignited fires in the Wuma, Yong’anshan, Tuqiang and Amur regions have exhibited persistent and significant clustering during the past 12-year period, although in certain years (e.g., 2015 and 2018) the fire events were more scattered and random, showing no significant clustering. The interactions vary among different factor types, with meteorological interactions being particularly prominent and playing a dominant role in the mechanism of lightning-ignited fire occurrence. This study reveals the spatiotemporal evolution patterns and key driving mechanisms of lightning-ignited forest fires, providing scientific basis for more refined and region-specific forest fire prevention and management strategiess.

Key words: lightning-ignited forest fires, driving factors, two-dimensional Gaussian kernel density, geographical detector, Daxing’ anling Mountains

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