沙漠/黄土过渡带13kaBP以来季风演化的古植被记录  

The Palaeovegetation Record of Monsoon Evolution in the Desert_ loess Transition Zone for the Last 13 ka BP

作　　者：李小强[1] 周卫建[1] 安芷生[1] 董光荣[2] 

机构地区：[1]中国科学院黄土与第四纪地质国家重点实验室,西安710054 [2]中国科学院兰州沙漠研究所,兰州730000

出　　处：《Acta Botanica Sinica》2000年第8期868-872,共5页Acta Botanica Sinica（植物学报：英文版）

基　　金：国家重点基础研究专项! (G19990 43 4 0 2 ) ;中国科学院重大项目! (KZ_95 2_S1_419)

摘　　要：利用花粉分析结果并结合有机碳δ13 C及高精度14 C测年等资料 ,阐明沙漠 /黄土过渡区 1 3kaBP以来古植被记录的季风气候事件。古植被经历了荒漠草原_干草原_半荒漠_湿润草原_荒漠_疏林草原_荒漠草原_草原_荒漠草原 9个阶段。冰后期的半荒漠_湿润草原_荒漠对应于其中冷干_凉湿_冷干的YoungerDryas事件 ,全新世气候适宜期以及 4.5～ 3.The study was to clarify the events of monsoon climate recorded by the palaeovegetation, using the results of pollen analysis, organic carbon δ 13 C, together with high_resolution 14 C dating in the desert_loess transition zone for the last 13 ka BP. The palaeovegetation went though in the order of 9 periods viz.: desert_grassland, steppe, semi_desert, humid_grassland, desert, sparse_wood_grassland, desert_grassland, grassland, and desert grassland. The semi_desert, humid_grassland, and desert corresponded with the Younger Dryas events of cold_dry, cool_humid, and cold_dry climate after the end of the last glaciation. The optimum of the Holocene and other humid period between 4.5-3.5 ka BP were of high significance in research area.

关 键 词：沙漠/黄土过渡带 古植被 季风演化 气候事件 

分 类 号：Q914.5[天文地球—古生物学与地层学]