中文摘要：

如何根据沉积物中的炭屑记录准确重建火历史是当前古火研究的热点.在古火研究中,大于125μm的大炭屑和小于125μm的微炭屑是最常用的炭屑数据.本文根据大兴安岭以北的漠河县图强泥炭剖面（TQ）的微炭屑面积浓度（AC）、微炭屑颗粒浓度（MiN）和大炭屑颗粒浓度（MaN）这3种不同类型的炭屑数据并利用目前国际上使用比较广泛的CharAnalysis模型定量重建了该地区的火历史.研究结果表明,同一沉积剖面不同类型的炭屑数据所重建的火历史总体规律基本一致,均表现出在距今1690年以来着火次数为12～14次;火事件间隔期变化均较为平缓,单次火事件的平均间隔期为81～124年;火事件发生频率经历了先上升后下降再上升的变化趋势,平均频率为3.5～4.1次/500年.但3种不同类型的炭屑数据重建火事件的次数、频率和间隔期之间仍有一些差异.这种差异可能是由于炭屑破碎程度不同所致.

英文摘要：

Tuqiang section （TQ） （52°56＇28.61″N, 122°51＇30.65″E） with a peat sediment of 62cm thick is located in the north of Daxing＇an Mountain, Heilongjiang Province. We collected 62 samples at intervals of lcm. All the samples were used for charcoal analysis and number as well as area measurements from macroscopic and microscopic charcoal were used for fire-history reconstructions. Three dated samples, at depth of 19- 20cm, 39 40cm and 61-62cm, yielded ages of680±14cal.a B.P., 1295±20cal.a B.P. and 1690±30eal.a B.P., respectively. Age-depth model presented a good correlation between age and depth. Many studies have particularly focused on how to reconstruct fire-history accurately based on charcoal records in peat and lake sediments. In the field of paleo-fire research, macroscopic charcoal larger than 125μm and microscopic charcoal smaller than 125μm are the most common charcoal data. In this study, CharAnalysis technique was used to reconstruct fire regimes in Daxing＇an Mountain. Three kinds of charcoal data including area concentration of microscopic charcoal （ AC ）, particle concentration of microscopic charcoal （ MiN ） and particle concentration of macroscopic charcoal （MaN） were processed for Char Analysis. Results indicated that fire-history analysis based on AC, MaN and MiN identified 12, 12 and 14 fire events; mean fire return intervals （FRIs） were 124a, 81a and 107a per fire event; mean fire frequencies （fire frequ.） were 3.5, 3.5 and 4.1 fire events per 500a respectively. Comparison of the fire reconstruction results turns out that fire-history showed almost the same changing trend： 12 FRI varied smoothly and mean FRI was 81 - 124a per fire per 500a with a trend of firstly rising, then failing down return interval and fire frequency still presented some affecting the fire reconstruction results. 14 fire events occurred from 1690a B.P. to nowadays; event; and mean fire frequency was 3.5 - 4. 1 fire events and ultimately going up again. But the fire events, fi