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| 再论罗布泊"大耳朵"地区的干涸时间 | |
| 引用本文： | 钟骏平,马黎春,李保国,蒋平安,邱宏烈,武红旗.再论罗布泊"大耳朵"地区的干涸时间[J].干旱区地理,2008,31(1):10-16. |
| 作者姓名： | 钟骏平 马黎春 李保国 蒋平安 邱宏烈 武红旗 |
| 作者单位： | 1. 新疆农业大学资源与环境学院,新疆,乌鲁木齐,830052 2. 中国农业大学资源与环境学院,北京,100094 3. 美国加州州立大学洛杉机分校,洛杉机,CA90032-8253 |
| 基金项目： | 国家自然科学基金 , 教育部长江学者和创新团队发展计划 , 自治区土壤学重点学科基金 |
| 摘 要： | 在收集前人考察成果及各类遥感影像基础上,通过实地调查,对罗布泊"大耳朵"地区干涸时间获得若干新认识。经过对1958年航片重新解译,认为根据1958年航测资料估绘,于1963年出版的罗布泊1:100 000地形图在"大耳朵"地区标注地物属性不正确,1958年干涸的环状盐壳地貌已经形成,未被洪水淹没。盐沙包137Cs分析结果表明,高约1 m盐沙包自上世纪50年代以来含137Cs堆积层仅表层9 cm,证明1958年"大耳朵"未被洪水淹没。"大耳朵"地区干盐湖盐壳粉砂含量高达10%-30%,如此大量风尘堆积的存在,也说明其形成不可能在4~5年内完成。土壤下层湖积淤泥14C测定结果表明在剖面F01处全新世早、中期均为水淹没并植物茂盛,最上层位于深105 cm处淤泥距今3 000余年。罗布泊"大耳朵"地区除"耳心"在20世纪30年代还有水覆盖外,其余广大盐壳区主要是在全新世晚期,由西向东逐渐干涸,完成由淡水湖-半咸水湖-咸水湖-盐湖-干盐湖的转变。 |
| 关 键 词： | 罗布泊 “大耳朵”地区 干涸时间 |
| 文章编号： | 1000-6060(2008)01-0010-07 |
| 收稿时间： | 2007-06-14 |
| 修稿时间： | 2007-10-25 |
Rediscussion on the latest drying up of the "Great Ear" in the Lop Nor area |
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| ZHONG Jun-ping,MA Li-chun,LI Bao-guo,JIANG Ping-an,QIU Hong-lie,WU Hong-qi.Rediscussion on the latest drying up of the "Great Ear" in the Lop Nor area[J].Arid Land Geography,2008,31(1):10-16. | |
| Authors: | ZHONG Jun-ping MA Li-chun LI Bao-guo JIANG Ping-an QIU Hong-lie WU Hong-qi |
| Abstract: | Based on the previous survey results,various remote sensing imagery,and authors' field investigation,a few new understandings on the timing of the latest drying up of the "Great Ear" in the Lop Nor area were achieved.A reinterpretation of the 1958 aerial photographs completed suggest that the official topographic maps derived from the 1958 aerial photographs for the study area are incorrect in properties of several surface features.The concentric salt crust landform was already in place prior to the 1958 great flood and only a small portion of the area of the "Great Ear" was flooded.137Cs isotope dating results show since 1950's only 0-9cm surface soil had deposited that reject the hypothesis that the "Great Ear" in the Lop Nor area was formed by rapid drying up of the 1958 flood water within 4 to 5 years during the early 1960's.And the high sediment concentration of salt crust rejects the formation only 4~5 years also.14C isotope dating results at the 105 cm deep puddle soil layer of profile F01 shows its age more then 3 000 a.It means during the early and mid Holocene there were immersed by water and plant growth thickly.Except for the inner part of the "Great Ear" which was still covered by lake water in 1930's,the widespread slat crust area within the "great Ear" area was formed during the late Holocene(3 000 a B P).The "Great Ear" experienced the fresh water lake-semi saline lake-saline lake-salt lake-dry salt lake stages. |
| Keywords: | Lop Nor Lake "Great Ear" Area latest drying up time |
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