以大青山调角海子剖面的孢粉和地球化学分析资料为依据,结合邻区古土壤序列、湖泊演化及考古研究资料,阐明内蒙古中西部地区全新世气候最适宜期始于9250aB.P.左右,结束于4000aB.P.前后;6330aB.P.前后出现大暖期植被与气候变化的重要转折;6850～6330aB.P.为全新世气候最适宜期的鼎盛期,当时调角海子地区植被为针阔叶混交林,气温比现在高2～3℃,降水量至少高于现代150～200mm.

According to the sporo pollen and chemical analysis of Diaojiaohaizi section on the top of Daqing Mountain, refering to paleosoil, lake evolutions and archaeological materials in the nearby regions, this paper inquires into the climate and environment during the megathermal period of the Holocene in middle west Inner Mongolia. This study reveals that: (1) the megathermal period of the Holocene started in 9400 a B.P. and ended in 3800 a B.P., however the climatic Optimum of the Holocene marked by humidity started in 9250 a B.P. and ended in 4000 a B.P.; (2) the megathermal period was divided into two parts by 6330 a B.P., the climate of the early part was temperate and wet, yet the climate of the late part was relatively warm and dry. (3) 6850-6330 a B.P. is a climatic super period of the megathermal and the Optimum of the Holocene when temperature was 2-3℃ higher and precipitation was at least 150-200 mm more than those of present, and the vegetation was coniferous and declduous broad leaved mixed forest.