西北干旱区石羊河流域全新世早期植被与环境演化  

Vegetation and environmental changes based on high resolution pollen records in Shiyang River basin,arid lands NW China during early Holocene

作　　者：朱艳[1] 巨天珍[1] 陈发虎[2] 张家武[2] 

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070 [2]兰州大学资源环境学院,兰州730000

出　　处：《西北植物学报》2001年第6期1059-1069,共11页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金重点资助项目 ( 4 9731 0 1 0 );"973"国家重点基础研究发展规划项目 ( G1 990 4 35 0 1 )资助;西北师范大学创新工程资助

摘　　要：西北干旱区石羊河流域终闾湖泊边缘三角城剖面湖相沉积物 (1 0 .0 - 6 .3 ka.B.P.)高分辨率 (每样平均 40～ 5 0 a左右 )孢粉分析揭示该流域全新世早期植被与气候环境变化过程是 :全新世初期 (1 0 - 9.8ka.B.P.) ,温度、湿度开始上升 ,山上针叶林发育 ,该期持续较短时间后 ,温度、湿度下降 (9.8- 9.2 ka.B.P.) ,山上森林萎缩 ,山下荒漠范围扩大 ;此后是一个持续时间较长、波动的温度、湿度上升、植被发育状况逐步好转的过程 (9.2 - 7.75 ka.B.P.) ;随后又是短暂的气候冷干、植被恶化阶段 (7.75 - 7.2 5 ka.B.P.)和一个相对持续时间较长 ,植被发育较好的暖湿期 (7.2 5 - 6 .3 ka.B.P.)。石羊河流域全新世早期气候环境变化具有较强的不稳定性 ,每个相对暖湿期和冷干期中都有多个次一级的冷干、暖湿波动 。The Sanjiaocheng section,located at the end of Shiyang River (closed basin) in arid land,Northwest China,well suited for reconstruction of paleao climate and paleao environment.This study focuses on the lower portion (460-292 cm) of the Sanjiaocheng section.A series of radiocarbon dates bracketed those lacustrine sediments deposited between 10 ka.B.P.and 6.3 ka.B.P.The section was sampled at 2 cm intervals for pollen analysis and the resolution of each sample is ca 40-50 a.The results from pollen assemblages analysis indicate that the sequence of paleao environment and vegetation changes is:the initial period (10-9.8 ka.B.P.) is temperate warm and wet.Afterwards,there was a period (9.8-9.2 ka.B.P.) of cold and dry as well as deteriorated vegetation followed by a period (9.2-7.75 ka.B.P.) temperature and humidity increasing and vegetation growing well.Then a short period (7.75-7.25 ka.B.P.) of the coolest and driest climate and the seriously deteriorated vegetation appeared;and then it is shift to a longer period (7.25-6.3 ka.B.P.) of warmest and wettest,along with the vegetation growing well.The environment changed rapidly with sub changes in each period in the arid lands,Northwest China,during the early Holocene.

关 键 词：高分辨率 孢粉记录 植被变化 早全新世 石羊河流域 西北干旱区 气候变化 

分 类 号：Q914.72[天文地球—古生物学与地层学] Q914.5[生物学—古生物学]