内蒙古大青山调角海子地区全新世气候与环境重建研究

以全封闭湖泊调角海子湖相沉积的高分辨率采样为基本分析材料，采用孢粉分析、沉积地球化学分析、

Reconstruction of climate and environment since the holocene in Diaojiaohaizi Lake Area,Daqing Mountains,Inner Mongolia

By means of sporo-pollen and geochemistry analysing and 14C dating of the sediment of Diaojiaohaizi section,the climate and environment of the Holocene in Diaojiaohaizi area were reconstructed.There are following conclusions: 　　(1)Climate and environment changes since 11500 aBP in Diaojiaohaizi area can be divided into 5 phases:11500～10200 aBP,10200～9400 aBP,9400～6900 aBP,6900～3800 aBP and 3800～1900 aBP,and the last two phases can be further divided into 3 subphases separately. 　　(2)From 11500 to 10200 aBP,the temperature was 5℃ lower than that of today and the vegetation was high mountain frozen desert. 　　(3)Temperature abruptly rose in 10200～10100 aBP.During 10200～9400 aBP,temperature was only 1～1.5℃ lower and precipitation was 30～50mm higher than those of today.The vegetation was forest steppe. 　　(4)The Megathermal of the Holocene started in 9400 aBP and ended in 3800 aBP.However the climatic Optimum of the Holocene marked by humidity started in 9200 aBP,and ended in 4000 aBP. 　　(5)The Megathermal was divided into two parts by 6300 aBP,the climate of the early part was temperate and wet,yet the climate of the late part was relatively warm and dry. 　　(6)6900～6300 aBP was a climatic super period of the Megathermal and the Optimum of the Holocene in which temperature was 2～3℃ higher and precipitation was at least 150～200mm more than those of present.The vegetation was needle-leaved and deciduous broad-leaved mixed forest. 　　(7)During 6300～3800 aBP,climate was relatively warm and dry.temperature was 2～3℃ higher and precipitation was 150mm more than those of today and the vegetation was needle-leaved and deciduous and broad-leaved mixed forest with Pinus as the main kind of trees. 　　The period of 4700～3800 aBP was the climatic optimum which was only inferior to the super period of Optimum in 6900～6300 aBP. In this period,temperature was 3℃ higher and precipitation was at least 150mm more than those of present.