文献类型：期刊文献

中文题名：气候变暖背景下内蒙古大兴安岭林区森林可燃物干燥状况的变化

英文题名：The changes of forest fuel dryness conditions under global warming in Inner Mongolia Daxing'anling forest region

作者：赵凤君[1] 舒立福[1] 田晓瑞[1] 王明玉[1]

第一作者：赵凤君

机构：[1]中国林业科学研究院森林生态环境与保护研究所,国家林业局森林保护学重点实验室,北京100091

年份：2009

卷号：29

期号：4

起止页码：1914-1920

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：林业公益性行业科技专项资助项目(200804001);国家“十一五”科技支撑资助项目(2007BAC03A02)

语种：中文

中文关键词：气候变暖;可燃物干燥状况;细小可燃物湿度码;半腐层湿度码;干旱码;大兴安岭

外文关键词：global warming,forest fuel dryness conditions,FFMC,DMC,DC,Daxing＇an mountains

分类号：Q143

摘要：可燃物湿度是评价林火发生危险程度的最直接指标。林火的发生和蔓延很大程度上受气象条件的制约,气候变暖对林火产生重要影响。利用每日气象数据和加拿大火险天气指数系统(FWI),计算了1972～2005年内蒙古大兴安岭林区森林可燃物的3个湿度码,即细小可燃物湿度码(FFMC)、半腐层湿度码(DMC)和干旱码(DC);并分别春季防火期、秋季防火期及夏季非防火期,研究了3个湿度码长时间序列的变化趋势,在此基础上分析了气候变暖背景下林区可燃物干燥状况的变化及对林火的影响。结果表明:1972～2005年FFMC、DMC和DC的季节性均值都呈增加趋势,且夏季FFMC和DMC增加趋势显著;这意味着1972～2005年可燃物的干燥状况呈增加趋势,其中夏季非防火期表层和半腐层可燃物的增加趋势显著。可燃物干燥状况的增加,特别是夏季可燃物干燥状况的增加,是近些年林区夏季雷击火灾频发的主要原因之一。半腐层和深层可燃物干燥状况的增加,会加大火灾控制和火场清理的难度。在未来更暖的气候条件下,林区可燃物的干燥状况会变得更加严峻。
Fuel moisture content is a good index to assess fire potential.Fire occurrence and spread are limited by meteorological conditions on large degree,and global warming have influences on forest fires.By using daily meteorological data and Canadian Fire Weather Index（FWI）System,three fuel moisture codes had been calculated during 1972-2005 for Daxing＇an mountains in Inner Mongolia,such as Fine Fuel Moisture Code（FFMC）,Duff Moisture Code（DMC）,Drought Code（DC）.Long-time trends of moisture codes and its effects on fire occurrence and spread were analyzed respectively in spring fire-prevention period,autumn fire-prevention period and summer non-fire-prevention period.The results show that the seasonal averages of FFMC,DMC and DC have an increasing tendency during 1972-2005,and FFMC,DMC increased significantly in summer.That means the fuel-dryness conditions during 1972-2005 had an increase-tendency and especially expressed in surface-layer and upper-duff layer fuel in summer.The fuel-dryness condition changes may be a reason for frequent lightning fires especially in summer in recent years.In addition,the duff fuel-dryness severity increased fire control and mop-up difficulties.In future,the fuel-dryness conditions in Daxing＇anling forest region will become more severe under a warmer climate.