| 新疆柴窝堡湖沉积物中环境敏感粒度组分揭示的环境信息 |
| |
| 引用本文： | 马龙,吴敬禄,吉力力·阿不都外力.新疆柴窝堡湖沉积物中环境敏感粒度组分揭示的环境信息[J].沉积学报,2012,30(5):945-954. |
| |
| 作者姓名： | 马龙 吴敬禄 吉力力·阿不都外力 |
| |
| 作者单位： | 1. 中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室,乌鲁木齐,830011
2. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,南京,210008 |
| |
| 基金项目： | 中国科学院知识创新重要方向性项目(编号:KZCX2-EW-308;KZCX2-YW-GJ04);中国科学院“西部之光”人才培养计划西部博士项目(编号:XBBS201106)共同资助 |
| |
| 摘 要： | 通过对柴窝堡湖沉积物剖面和流域表层沉积物进行粒度分析，结合沉积剖面年代序列，研究了柴窝堡地区的环境演变与沙尘暴事件。首先通过主成分因子分析，对柴窝堡湖沉积物剖面粒度不同粒级组分含量进行了研究，探讨了湖泊沉积物的物质来源，获得了两个主控因子F1和F2，它们控制了湖泊沉积物近97.7%的粒度变化特征。研究表明，F2代表了以57 μm为众数粒径的次总体，主要来源于地表风沙侵蚀；而F1为以7 μm为众数粒径的次总体，主要受流水作用控制。进而通过粒径-标准偏差法，提取了湖泊沉积物中环境敏感粒度组分，风成组分C2（20~209 μm）反映了区域风沙活动的历史，并揭示了1910-1930年和1980-2000年为百年来的两个沙尘暴相对活动强烈的时期。沉积物中记录的1980年和2000年左右的沙尘事件与器测记录及历史文献记载具有很好的一致性。最后利用均值突变诊断分析，发现柴窝堡湖地区1910年前后存在近百年来最强的沙尘事件，揭示了近百年来该地区一次最强的环境突变事件。
|
| 关 键 词： | ,柴窝堡湖,湖泊沉积,粒度,敏感组分 |
Environmental Changes Inferred from Environmentally Sensitive Grain-size Component Records in Chaiwopu Lake,Xinjiang |
| |
| Institution: | MA Long1 WU Jing-lu2 JILILI Abuduwaili1(1.State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011; 2.State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences,Nanjing 210008) |
| |
| Abstract: | Grain-size analysis of a sediment core CW02 and surface sediments of the drainage area,retrieved from Chaiwopu Lake of Xinjiang,were carried out using a Malvern 2 000 grain-size analyzer.Combining with 137Cs dating,a continuous high-resolution record of environmental changes was studied over the past 150 years.Firstly,according to primary components analysis of the contents of different grain-size,the material source of lake sediment was discussed.It showed that the large particle fraction of lake sediment was from the drainage surface sediment.And then,environmentally sensitive grain-size components were extracted by the variations of the grain-size standard deviation.The results indicated that the content/mean-size of sensitive grain-size component(20~209 μm) is sensitive to the regional sand-dust storm events in Chaiwopu lake basin.During the last 150 years,the strong sand-dust storm occurred during 1910—1930AD and 1980—2000AD.Historical documents also recorded the strong dust storms around 1910s and 1980s.Based on the analysis of the abrupt change points,the sediment grain-size increased abruptly around 1910AD,which indicated an abrupt environmental event. |
| |
| Keywords: | Chaiwopu Lake lake sediment grain size sensitive components |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
