| 陕西榆林风沙滩区全新世气候和环境变迁 |
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| 引用本文： | 陈淑娥,樊双虎,刘秀花,董汉文,陆璐,王莉丽.陕西榆林风沙滩区全新世气候和环境变迁[J].地球科学与环境学报,2010,32(1):81-88. |
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| 作者姓名： | 陈淑娥 樊双虎 刘秀花 董汉文 陆璐 王莉丽 |
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| 作者单位： | 长安大学,地球科学与资源学院,陕西,西安,710054 |
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| 基金项目： | 陕西省自然科学基金项目 |
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| 摘 要： | 榆林长城沿线处于环境变化敏感带,其风沙滩区沉积剖面的磁化率和粒度分析结果显示,该区全新世早期11 500~10 000 a BP随着全球气候的逐渐转暖,磁化率、黏粒和粉沙含量逐渐增高;全新世中期的10 000~4 500 a BP气候相对比较湿润,植被覆盖度增大,风沙活动减弱,地表沉积物当中粉沙和黏土成分含量显著增大,风化成壤作用增强,地表发育沙质弱古土壤;全新世中期后段的4 500~3 000 a BP期间,气候以比较温和湿润为主,但在4 200~4 000 a BP出现一个气候干旱事件,风沙活动强烈;近3 000 a以来,气候显著干旱化,波动频繁,地表风沙沉积物显著变粗,表现出有5次沙漠扩张。该区生态环境演化、人文历史变迁基本上是自然因素与人为活动综合作用的结果,以自然演化为主,近代人为因素对环境变化起着加强和放大作用。
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| 关 键 词： | 全新世 气候 风沙活动 环境变化 榆林 |
Holocene Climate and Environmental Changes in the Eolian Sand Section of Yulin,Shaanxi Province |
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| CHEN Shu-e,FAN Shuang-hu,LIU Xiu-hua,DONG Han-wen,LU Lu,WANG Li-li.Holocene Climate and Environmental Changes in the Eolian Sand Section of Yulin,Shaanxi Province[J].Journal of Earth Sciences and Environment,2010,32(1):81-88. |
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| Authors: | CHEN Shu-e FAN Shuang-hu LIU Xiu-hua DONG Han-wen LU Lu WANG Li-li |
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| Institution: | CHEN Shu-e,FAN Shuang-hu,LIU Xiu-hua,DONG Han-wen,LU Lu,WANG Li-li (School of Earth Sciences and Resources,Chang'an University,Xi'an 710054,China) |
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| Abstract: | The eolian-sand section along the Great Wall in Yulin,Shaanxi province,is sensitive to climate and environmental changes.The magnetic susceptibility and particle-size analysis in Dabaodang profile showed that the early Holocene(11 500~10 000 a BP),was a transition during the change in eolian regime and dust source because of the weakened northwesterly monsoon along with the global climatic amelioration;the middle Holocene(10 000~4 500 a BP) was relatively humid,while vegetation coverage increased,aeolian ac... |
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| Keywords: | Holocene climate eolian sand activity environmental change Yulin |
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