《Proceedings of Symposium from Cross-strait Environment & Resources and 2nd Representative Conference of Chinese Environmental Resources & Ecological Conservation Society》 2010年
Climate Variation and Abrupt Change in Upper and Middle Yishu River during 4910-3030 cal.yr BP
【摘要】：正Based on the mean grain size of sediment,content of chemical element Strontium(Sr) and Zirconium(Zr),magnetic susceptibility,organic carbon stable isotope(δ~(13)C) and ~(14)C-constrained chronologies,the climate change during 4910-3030 cal.yr BP in upper and middle Yishu River was reconstructed.The climate was warm and humid between 4910 cal.yr BP and 4270 cal.yr BP.From 4270 cal. yr BP to 3900 cal.yr BP,the climate changed dramatically,the temperature and precipitation descend obviously,meaning an abrupt change has taken place in this period.During 3900 cal.yr BP - 3520 cal.yr BP, the climate is cold and instability,then the temperature went up gradually during 3520 cal.yr B.P.- 3030 cal. yr BP.