内蒙古东部全新世地层发育特征与气候波动关系的研究

Study on the Relationship between theDeveloped Characteristics of Holocene Epoch Strata and Climatic Fluctation in the East Inner Mongolia

通过资料分析，通过对内蒙古东部各沙地第四纪全新世气候地层中的古土壤孢粉和Ｃ￣（１４）测年的分析，划分出四个气候湿润期：即１００００—７０００，６０００—５０００、３０００—２５００、１５００—１０００ａ，Ｂ．Ｐ与四个气候干燥期：即７０００—６００００、５０００—３０００、２５００—１５００、１０００ａ，Ｂ．Ｐ—现在；以及相对应的风沙固定期和风沙扩展期，风沙固定期原始自然景观为疏林草原、森林草原呈现，此时沉积了黑沙土或古土壤；目前本区正处于Ａ．Ｄ１０００ａ后的气候干燥期内，特别是Ａ．Ｄ１６００ａ后，气候异常干燥，风蚀—风积作用加强。

fter analysed the paleosol sporopollen and C￣(14)-measuring years of the Quaternary holocene epoch climatic strata in the sandy ground of the east Inner Mongolia. the four climatic wet periods were divided,there are 10000-7000.6000-5000,3000- 2500 and 1500-1000a,B.P. And the four climatic dry periods also were divided,there are 7000-6000,5000-3000,2500-1500 and 1000a,B. P till now.The corresponding fixed and extented periods of the wind-drift sand were got.The primitive nutural landscape in the fixed period of wind-drift sand was the veld or forest-steppe,but now the black- sand or paleosol had been deposited. Now the area in the studied are in the dry climatic pe- riod after A.D. 1000a,Especially,it was in the abnormal dry climate and wind deposit and erosion were increased after A,D 1600a.