摘要
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、14 C测年等多种分析手段 ,对调角海子地区全新世气候与环境进行了综合研究。结果表明 :全新世气候与环境演化可划分为 5个阶段 ,其中后两个阶段又可分为 3个亚段 ;全新世大暖期的时代为 94 0 0～ 380 0 a BP;全新世大暖期具有二分性 ;690 0～630 0 a BP为全新世气候最适宜的鼎盛期 ,当时气温比现在高 2～ 3℃ ,降水量至少高于现代 1 50～ 2 0 0 mm,植被为针阔叶混交林。
By means of sporo-pollen and geochemistry analysing and 14 C 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.
出处
《生态学报》
CAS
CSCD
北大核心
2001年第4期538-543,共6页
Acta Ecologica Sinica
基金
国家"八五"攀登计划资助! ( 85-2 7-1 )资助项目
关键词
大青山
全新世
环境重建
内蒙古
气候重建
reconstruction of climate and environment
holocene
Daqing Mountains
