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Acta Prataculturae Sinica ›› 2016, Vol. 25 ›› Issue (4): 16-25.DOI: 10.11686/cyxb2015286

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Temporal and spatial dynamics of grassland fires in Inner Mongolia

ZHOU Huai-Lin1, 2, WANG Yu-Hui1, *, ZHOU Guang-Sheng3   

  1. 1.State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
    2.College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3.Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • Received:2015-06-25 Online:2016-04-20 Published:2016-04-20

Abstract: Analyses of a dataset for grassland fires in Inner Mongolia from 1981 to 2005 showed that there were 3142 grassland fires in the last 25 years. Among them, 68.84% were caused by human activities, 5.19% were caused by lightening, and 25.97% were attributed to unknown causes. Grade Ⅲ and Ⅳ fires accounted for the majority (81.17%) of grassland fires with known causes. The number of grassland fires generally decreased over time, but tended to increase in the early 21st century. Spring and autumn were the main fire seasons, with more human-caused fires in April and more lightning-caused fires in May and June. During the main fire seasons, human-caused fires tended to occur between 9:00 am to 16:00 pm, while lightning-caused fires mainly started between 13:00 pm and 17:00 pm. In terms of geographical distribution, the number of grassland fires in Inner Mongolia decreased from the northeast to the southwest. The areas with the most fires were the Xin Barag Right Banner, the Chenbarhu Banner, and the Yakeshi-Oroqen Autonomous Banner, the total number of fires in these regions ranged from 119 to 187. These results indicate that the grassland fire prevention region in Inner Mongolia should include its central, eastern and northeast regions, and that efforts to detect and control fires should be made in the spring, especially between 9:00 am and 16:00 pm.