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Scientia Silvae Sinicae ›› 2011, Vol. 47 ›› Issue (11): 99-105.doi: 10.11707/j.1001-7488.20111116

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Characteristics of Lightning Fire in Daxing'anling Forest Region from 1972 to 2005 and Its Relationships with Drought Index

Jia Bingrui1, Zhou Guangsheng1, Yu Wenying2, Fang Dongming1   

  1. 1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences Beijing 100093;2. Institute of Atmospheric Environment, China Meteorological Administration Shenyang 110016
  • Received:2010-07-04 Revised:2010-08-06 Online:2011-11-25 Published:2011-11-25

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Abstract:

The characteristics of lightning fires from 1972 to 2005 and its relationships with Palmer drought severity index (PDSI) and Keetch-Byram drought index (KBDI) in Daxing’anling forest region were analyzed in this paper. The results showed that the lightning fire mainly happened from May to September. A peak of the lightning fires occurred in June, accounting for about 42% of the annual numbers. The maximum burned area happened in May and June, accounting for about 85% of the annual burned areas. Monthly dynamics of numbers and burned area of lightning fires could be expressed as one-humped curves. The monthly dynamics varied with drought indexes. A typical one-humped curve presented with KBDI and the driest months were from May to July, while a weak one-humped curve presented with PDSI, with May drier and June and July wetter. Annual numbers of lightning fires could be closely correlated with PDSI in September (R2=0.47, P<0.01) or KBDI in June and August(R2=0.57,P<0.01), and annual burned areas of lightning fires with PDSI in August(R2=0.20, P<0.01) or KBDI in June(R2=0.40,P<0.01). It was indicated that KBDI was more suitable for simulating the characteristics of lightning fires in Daxing’anling forest region than PDSI.

Key words: lightning fire, Palmer drought severity index (PDSI), Keetch-Byram drought index(KBDI), Daxing&rsquo, anling forest region

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