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林业科学 ›› 2011, Vol. 47 ›› Issue (11): 99-105.doi: 10.11707/j.1001-7488.20111116

• 论文 • 上一篇    下一篇

1972—2005年大兴安岭林区雷击火特征及其与干旱指数的关系

贾丙瑞1, 周广胜1, 于文颖2, 方东明1   

  1. 1. 中国科学院植物研究所植被与环境变化国家重点实验室 北京100093;2. 中国气象局沈阳大气环境研究所 沈阳110016
  • 收稿日期:2010-07-04 修回日期:2010-08-06 出版日期:2011-11-25 发布日期:2011-11-25
  • 通讯作者: 周广胜

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

摘要:

对1972—2005年大兴安岭林区雷击火特征及其与Palmer干旱指数(PDSI)和Keetch-Byram干旱指数(KBDI)的关系分析表明: 雷击火主要发生在5—9月,峰值出现在6月,约占全年雷击火次数的42%; 雷击火的最大过火面积出现在5月和6月,约占全年过火总面积的85%。雷击火发生次数和面积的月动态均呈单峰型曲线变化,不同干旱指数的动态不同,其中KBDI的月动态呈单峰型曲线变化,5,6,7月最干旱; 而PDSI则呈弱单峰型曲线变化,5月较干旱,6月和7月则较湿润。雷击火的年发生次数与9月的PDSI (R2=0.47,P<0.01)或6月和8月的KBDI (R2=0.57,P<0.01)关系密切,年过火总面积则与8月的PDSI(R2=0.20,P<0.01)或6月的KBDI(R2=0.40,P<0.01)有一定的关系。KBDI更适于描述大兴安岭林区的雷击火特征。

关键词: 雷击火, Palmer干旱指数(PDSI), Keetch-Byram干旱指数(KBDI), 大兴安岭林区

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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