Field sampling was conducted in the sediment profile of Changxu Village(CX),Shandong Province,and the analysis and determination of paleoenvironmental indicators such as black carbon,magnetic susceptibility,loss on ignition,geochemical elements etc.were taken attempting to explore the interaction between biomass burning,human activities,and climates.The results show that:1)During 4000-2800a BP.,the climate changed from warm and humid to cool and dry,and local wildfires occurred occasionally,of which black carbon showed an obvious peak in 3500～3000 years ago.This might be due to the black carbon particles produced by local human production and life induced biomass burning events during the Shang and Zhou dynasties,which caused a significant increase in black carbon concentration,through the process of erosion and re-accumulation by flowing water,and climate and vegetation were the limiting factors for the occurrence and spread of wildfires.2)During 2800-2000a BP.,the climate changed to a warm and dry,and the frequency of wildfires increased significantly,which might be related to the large area land use of ancient humans during the Spring and Autumn,and Warring States periods.The occurrence of wildfires was closely related to human activities and production methods,but vegetation was still prerequisites affecting the occurrence of wildfires.3)During 2000-500a BP.,the climate became cold and dry,and the frequency of wildfires was at a lower level and stabilized,probably because human production reached a stable stage,the land had been fully cultivated,while irrigated agriculture was established.Climate was the main controlling factor for wildfire events.4)In the last 500 yearsa BP.,the climate has been further arid,with widespread biomass burning,especially in the nearly 300 years of BP.It has entered a rapid increase stage,which was due to the drought of the climate since the Qing Dynasty,coupled with a sharp increase in population,and the intensification of human activities such as burning forests and reclaiming land.Human activities had become a key factor in the occurrence of wildfires.
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NSTL
维普
万方数据
