The History Of Fire History And Human Activities In Taixue Village Of Luoyang Basin

The Luoyang basin is located in the sensitive zone of temperate monsoon environment in China,and the landscape of the region is constantly changing due to the global climate change and the comprehensive influence of human factors.Since the holocene,the continuous aggravation of human activities has caused the ecological environment in the region to become worse and worse.The flood and waterlogging disasters in the basin are frequent,the water and soil erosion is serious,and the relationship between people and land becomes more and more intense.As a special environmental management tool,fire is not only affected by global climate change and environmental evolution,but also reflects the change of land use mode.Chip based on high resolution carbon and black carbon records,system of the regional ecological environment evolution law of fire,to improve the natural ecological environment,seeking the human and the nature harmonious regional sustainable development has important scientific significance.Aiming at the evolution of fire evolution and natural landscape evolution,based on the previous researches,this paper selects the TXC section of luoyang as the research object after careful and careful field investigation.Analysis and determination of various environmental substitution indexes of TXC profile.The time sequence of fire evolution in the holocene is reconstructed.Chip based on the analysis of the black carbon,carbon,and the geochemical element indicates human activity such as geochemical index,system to explore the regional fire frequency and monsoon climate,the interaction between human activities,trying to expound business village site area climate change on the effects of the human way of land use and the surrounding ecological environment changes in response to climate;The results of the study for the deep understanding in the area since the holocene climate drying trend under the background of ecological environment and the evolution of human social production process has important value,and for the ecological environment construction under the background of global warning and promoting sustainable development to provide scientific data.The main conclusions are as follows:(1)early holocene(～8500a B.P.),magnetic susceptibility(74.18 x 10-8m3·kg-1)and total organic carbon(TOC)(0.085%)showed low values,indicating that the climate was dry and cold during this period.At this stage,the concentration of black carbon and fine particles is low,and the probability of wildfire is small.The limited vegetation in the desert steppe inhibits the spread of fire in this area.(2)in the middle holocene(8 500～3 100a B.P.),the magnetic susceptibility(133.18 X 10-8 m3·kg-1)and the total organic carbon(TOC)22.63～55.43%were all high,indicating that the climate was warm and humid at this stage.However,the concentration of carbon particles showed a decreasing trend(<47.99 grains/g),and the increase of seasonal precipitation resulted in the suppression of large-scale fire occurrence.However,6000～5000 a B.P.black carbon and carbon dust concentration significantly increased(0.263 mg/g,286.45grain/g)element Mn,high zinc are present value(641.59 PPM),this may be related to yangshao period paleoanthropology set fire to the bottom of the temple ditch culture period and cultivated farmland and other activities.4200～4200 a B.P.magnetic susceptibility values present low(as low as 67.82 × 10-8 m3·kg-1),soil particle size of clay/silt ratio(0.14),partial degrees(SK)(0.04～0.12 phi)partial low,sorting coefficient(S)to large(0.33)sorting is poorer,show that the period of the study area as the flood season,biological soil environment is poor.At the same time,the concentrations of black carbon and carbon chips were low(0.015mg/g,81.06 grains/g).It is indicated that the ecological environment in this area is worsening,and the frequent occurrence of flood reduces the level of artificial biomass combustion.(3)in the late holocene(3100a B.P.～present),the magnetic susceptibility is low(87.43～95.53×10-8m3·kg-1),and the climate is further dry and cold.About 3 100 a B.P.peak is apparent in the carbon dust concentration(74.26 grain/g),at the same time,the stage P,Mn,zinc and other elements are present high value,this may be due to China’s xia shang period human set fire to and cultivated farmland and other activities.The content of black carbon and carbon chips increased(0.56g/mg,86.9 grain/g),and the biomass burning showed a significant increase.This may be related to the increase of human production and living in the late eastern han dynasty.It can be seen that the fire pattern of the holocene may depend on seasonal monsoon climate change and human land use interaction and its response to the east Asian monsoon climate.