浑善达克沙地高西马格剖面孢粉分析及植被演化的初步探讨  

A PRELIMINARY INVESTIGATION ON THE HOLOCENE VEGETATION CHANGES FROM POLLEN ANALYSIS IN THE GAOXIMAGE SECTION, HUNSHANDAK SANDY LAND

作　　者：李春雨[1] 徐兆良[1] 孔昭宸[1] 

机构地区：[1]中国科学院植物研究所系统与进化植物学重点实验室

出　　处：《植物生态学报》2003年第6期797-803,共7页Chinese Journal of Plant Ecology

基　　金：中国科学院知识创新工程重大项目 (KSCX1_0 8_0 2 )

摘　　要：为了探讨浑善达克沙地 5 0 0 0年以来的植被演化过程 ,我们对内蒙古正蓝旗境内高西马格湖人工挖掘2 .0m深的剖面进行了较高时间分辨率的孢粉分析 ,并参考孢粉组合与植被之间的对应关系 ,得出 :该期的植被和气候演化大致可以划分为 3个阶段 :阶段I(约 5 0 10～ 4 0 4 0aBP) ,孢粉组合是以落叶阔叶桦木 (Betula)和蒿属(Artemisia)植物花粉为优势 ,区域性分布有桦木林 ,当时气候较今温暖偏湿。阶段II(4 0 4 0～ 182 0aBP) ,旱生植物花粉占优势 ,其中蒿属和藜科的比值偏高 ,显示了草原植被占优势 ;根据该带蒿 /藜 (A/C)比值的频繁变化推断该时期可能有多次气候小波动。阶段III (182 0～ 2 0 0aBP) ,组合中仍然以草本植物的花粉为优势 ,但藜科植物在组合中大量增加 ,推测植被应为荒漠草原 ,气候更趋干旱 。In order to understand the changes of palaeoclimate and palaeovegetation in Hunshandak sandy land, pollen_spores have been studied from the Gaoximage section (42°57′14.2″ N, 115°22′3″ E, Alt 1 253 m) in the Hunshandak sandy land, Inner Mongolia, China. Combining pollen_spore assemblages and their relationships with vegetation, the result shows that climate and vegetation have experienced three periods of changes from 5 000 aBP to present. I. From 5 010 to 4 040 aBP, the main pollen_spore was deciduous broad_leaved plant (Betula) and the herb (Artemisia). During that time, Betula forest may have existed in that region. The climate was probably warm and humid. II. From the 4 040 to 1 820 aBP, the pollen assemblages of the area studied were dominated by pollen such as Artemisia and Chenopodiaceae. Grassland was developed during that time. There were probably several small climate fluctuations between aridity and humidity according to the changes of A/C (Artemisia/Chenopodiaceae) value. III. From 1 820 to 200 aBP, pollen spore assemblages show that Chenopodiaceae have dominated with some Artemisia, and the vegetation was deduced to be desert grassland. This implies that the climate became arid, which is similar to the current condition.

关 键 词：浑善达克沙地 高西马格湖 孢粉分析 植被演化 全新世 

分 类 号：Q948[生物学—植物学]