PALAEOCLIMATIC RECONSTRUCTION OF SPOROPOLLON RECORDED IN FANGXIANGSI PROFILE,TAIBAISHAN MOUNTAIN

In this paper climatic reconstruction of sporopollen data from Fangxiangsi profile was studied,through the sporopollen-climatic model created by sporopollen from surface soil in Taibaishan,Qinling Mountains.Furthermore,the climatic sequence of past one thousand years was obtained (including annual mean temperature,January mean temperature,July mean temperature and annual precipitaion).The results show that the small ice age started at 1200a AD and ended at 1920a AD,in which the grand ice age was 1350~1700a AD,coincided with results of historical data,ancient lakes,tree rings and glaciers.The climatic changes of study area are closed to Foyechi area located in south slope of Taibaishan Mountain.Because the heigth above sea level of Fangxiangsi located at the north slope of Taibaishan Mountain,is lower than Foyechi's,the value,fluctuate range and dropping range of air temperature in Fangxiangsi area turn higher,and annual precipitation is a little greater.When the value of air temperature turns higher,the annual range turns higher;however it turns lower,the opposition.This indicated that July mean temperature is sensitive for climatic changes,showing that the rise and decline of summer monsoon can't be ignored.