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基于MODIS的中国野火时空分布格局

焦琳琳1,2,常禹1**,胡远满1,王晓莉1,2   

  1. 1中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院大学, 北京 110049)
  • 出版日期:2014-05-10 发布日期:2014-05-10

Spatial and temporal distribution patterns of wildfires in China based on MODIS data.

JIAO Lin-lin1,2, CHANG Yu1**, HU Yuan-man1, WANG Xiao-li1,2   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;2University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2014-05-10 Published:2014-05-10

摘要: 野火是自然生态系统中重要的干扰因子,在维持生态系统多样性的同时,也对自然生态系统和人民的生命和财产构成重大威胁,野火时空分布格局研究有助于理解野火的发生规律,从而为野火的科学管理提供依据。本文基于MODIS火产品数据(2006—2012年),借助地理信息系统、遥感技术和SPSS统计软件,分析了中国野火的时空分布格局。结果表明:2006—2012年中国野火年过火面积呈下降趋势,年际变化波动较大,对年过火面积变化贡献率较大的省份主要分布在华南地区、西南地区和西北地区;中国野火过火面积月变化明显,其中3月过火面积最大,对月过火面积变化贡献率较大的是南方地区、西南地区、西北地区和东北地区;野火的发生和环境因子有密切关系为在丘陵地区、年降水量在400~800 mm的区域、年平均气温在0~10 ℃地区和针叶林中最易发生野火。本研究可为中国野火的火险区划和管理提供科学依据。

关键词: 种群结构, 植被组成, 外来种

Abstract: Wildfire is an important disturbance factor in natural ecosystems, posing great threats to people’s lives and properties while maintaining natural ecosystem diversity. Studying the spatial and temporal patterns of wildfires will help to understand the patterns of wildfire occurrence and thus provide the scientific basis for wildfire management. In this study, the spatial and temporal patterns of wildfires in China were analyzed using statistical software, SPSS, and GIS and remote sensing technology based on Terra/MOD14A2 data from 2006 to 2012. The results showed that the annual burned area tended to decrease generally although varied significantly among different years. The provinces greatly contributing to the change of the annual burned area were mainly from southern China, southwest and northwest regions. The monthly burned area had significant differences among various months and the most burned area occurred in March. The provinces greatly contributing to the change of the monthly burned area were from southern, southwest, northeast and northwest regions. Wildfires and environmental factors were closely related; wildfires easily occurred in hilly areas, in areas with average rainfall between 400 mm and 800 mm and average temperature between 0 ℃ and 10 ℃, and in coniferous forests. This study could provide a scientific basis for zoning wildfire risks and wildfire management in China.

Key words: exotic species., population structure, species composition