Natural and anthropogenic forest fires recorded in the Holocene pollen record from a Jinchuan peat bog,northeastern China
作者单位：Institute for the EnvironmentBrunel University(West London)Uxbridge UB8 3PHUK Environmental Engineering Research CentreThe Queen's University of BelfastBelfast BT9 5AGUK
会议名称：《中国科学院地质与地球物理研究所2008学术年会》
会议日期：2009年
学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学]
基 金：supposed by National Natural Science Foundation of China(Grants 40772114 and 40273037) K.C.Wong Education Foundation fellowship(administered by the Royal Society,London) the National Basic Research Program of China(Grant 2004CB720203)
关 键 词：Pollen record Fire Vegetation Human activity Holocene Northeastern China
摘 要：Pollen and charcoal particles from a Jinchuan peat(northeastern China) were examined to investigate the fire origin and interaction between climate,vegetation,fire and human activity during the *** results show that:(i)a broadleaved deciduous forest was dominant during the early Holocene;(ii)from～5500 *** *** was a gradual increase in coniferous trees(mainly Finns),and a decrease in broadleaved deciduous trees(***,Juglans,and Ulmus-Zelkova);(iii)after～4200 *** B.P.,the deciduous forest was replaced by a mixed forest of coniferous and deciduous trees;(iv)coniferous trees including Pinus,Abies and Picea further increased after～2000 *** B.P.,reflecting a cooler and drier climate after～5500-4200 *** *** layers of abundant microfossil charcoal particles(250-10μm) and the coexistence of macrofossil particles(2 mm) suggest two local fires:fire event 1(5120±66 *** B.P.) and fire event 2(1288±8 *** B.P.,AD 662±8). Charcoal layer 1,with a large amount of Monolete psilate spores,is superimposed on the long-term trend of vegetation changes,indicating a natural origin for fire event 1 that was probably facihtated by drying environmental conditions since the ***-type pollen and a low percentage of Monolete psilate spores were observed in charcoal layer 2,indicating that fire event 2 was caused by *** suggest that fire event 2 may be related to the spread of the Han fanning culture accompanied by the territorial expansion of the Tang Dynasty to the studied area in AD 668.
