花海湖泊全新世古风成砂的发现及其古环境解释  

Discovery of HOlocene Aeolian Sand in Huahai Lakeand its Environmental Significance

作　　者：胡刚[1] 王乃昂[1,1] 高顺尉[1] 李巧玲[1] 赵强[1] 郭剑英 王乃昂 

机构地区：[1]兰州大学资源环境学院,甘肃兰州730000

出　　处：《中国沙漠》2002年第2期159-165,共7页Journal of Desert Research

基　　金：中科院知识创新工程重大项目"西部生态环境演变规律与水土资源可持续利用研究"(KZCX1-10-02);国家自然科学基金项目(40071031);国家重点基础研究规划项目(G2000048701)联合资助

摘　　要：通过野外调查和室内分析，发现在花海剖面全新世出现了三次风成沙沉积，并对其原因进行了初步分析。初步认为风成沙的细粒组分可能主要为近源湖相，而粗粒组分则为沙漠戈壁区吹来。前两次风成沙在形成时代上可能与第一新冰期相对应，反映了沙漠的扩张状态。而且分析表明第一风沙形成期的冬季风强度和沙漠化过程似要比第二风沙期强，持续时间长。本区在全新世人类大规模活动之前就曾存在两次明显的沙漠化扩张过程，这为研究区域土地退化、荒漠化等问题提供了自然背景，特别是对西部大开发战略重点之一的生态环境保护与建设具有特殊的意义。Abstract: On the basis of field investigation and laboratory analysis, it was found that there were three lay-ers of aeolian sand in Huahai Section, a Holocene lacustrine sediments. It was primarily assumed that thefine group in aeolian sand was the deposition of nearly lacustrine composition, while the thick was fromdesert. The time of the earlier two layers of aeolian sand formed corresponds with the New Ice Age. More-over, it indicates that intensity of winter monsoon in the first period of aeolian sand formed was strongerthan that in the other twos in Holocene, and the duration is also longer. These provide natural backgroundof the soil regeneration, desertification and has significant implication to the preservation and constructionof ecological environments in West China.

关 键 词：花海 湖泊 全新世 古风砂 古环境 

分 类 号：P532[天文地球—古生物学与地层学]