| 鄱阳湖湖滨十万年来沙山的演化 |
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| 引用本文： | 任黎秀,和艳,杨达源.鄱阳湖湖滨十万年来沙山的演化[J].地理研究,2008,27(1):128-134. |
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| 作者姓名： | 任黎秀 和艳 杨达源 |
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| 作者单位： | 南京大学地理与海洋科学学院,南京,210093 |
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| 基金项目： | 致谢：此前,朱海虹、刘键等对鄱阳湖湖滨沙山做过大量工作为我们的研究奠定了基础.胥勤勉、陈可峰积极参加了2005年实地调查、样品采集和处理.在此一并致谢. |
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| 摘 要： | 鄱阳湖湖滨及湖口－彭泽段长江南岸有成群沙垄、沙山分布。2005年调查发现,可分为4个风成沙山期及7类沉积物。4个风成沙山期分别为95kaB. P.的老红沙山期、46kaB. P.的红沙山期、27kaB. P.~15kaB. P.左右的黄沙山期、250年来的近代沙山期。此外还有温暖时期沟谷里水动力作用下的次生堆积,湖滩上的风蚀残余沙以及黄沙山表面现代松散沙。比较不同时期风沙沉积的粒度组成,4个时期的风力大小基本呈现黄沙山期>近代沙山期>红沙山期>老红沙山期的状态,以上特点与末次间冰期以来多个亚冰期全球气候寒冷程度的变化具有可比性。
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| 关 键 词： | 鄱阳湖 沙山 粒度分析 风力 |
| 文章编号： | 1000-0585（2008）01-0128-07 |
| 收稿时间： | 1/7/2007 12:00:00 AM |
| 修稿时间： | 2007-09-14 |
Study on the evolution of sandy hills along Poyang Lake area for the last 100,000 years |
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| REN Li-xiu,HE Yan,YANG Da-yuan.Study on the evolution of sandy hills along Poyang Lake area for the last 100,000 years[J].Geographical Research,2008,27(1):128-134. |
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| Authors: | REN Li-xiu HE Yan YANG Da-yuan |
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| Institution: | Dept. of Urban &;|Recources, Nanjing University,Nanjing 210093,China |
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| Abstract: | Poyang Lake, which lies to the east of Mount Lushan in Jiangxi, is the biggest fresh water lake in China. It is also one of the abandoned lakes of the Yangtze River. As it is in the eastern monsoon area, it has a line vision in winter and a vast expanse in summer. Large areas of sandy hills appear around the Poyang Lake and the riverside of the Yangtze Rriver in the Hukou-Pengze section. They are well sorted and always come to 40 to 140 m high, looking like a desert in East China. Lots of scientists have done research in these sandy hills since the mid-20th century. They started with the formation and evolution of these sandy hills, and some of them analyzed the ancient climate change by the magnetic properties of sand samples. Shaling sandy hill in Xingzi which lies on the west shore of Poyang Lake is one of those sandy hills. After field investigation and collection of 26 sandy sediment samples in March 2005, we used sifter and laser granularity to measure their grain size. We also use 14C dating and thermoluminescence dating for three samples. Based on the field investigation of the landform and physiognomy, we classified these sandy sediments in Xingzi into seven different kinds and four periods of aeolian sandy hills. Those four aeolian sandy hills periods are 95 kaB. P. Old Red Dune, 46 kaB. P. Red Dune, 27kaB. P.~15kaB. P. Yellow Dune and 250 years Modern Dune. The other three kinds of sediments are secondary deposit on valley bottom, wind-erosion residual deposit on the lake shore and loose aeolian sediments on the Yellow Dune surface. As the wind power is the main driver of sand, the grain size of these aeolian sediments can show the wind power for the time when they deposited. We compared the grain size of the sand samples and come to the conclusion that wind power in these four periods can be arranged by Yellow Dune, Modern Dune, Red Dune, and Old Red Dune in a descending order. By comparson of the sediment series with the deep-sea oxygen isotope curve change, the Old Red Dune period of Poyang Lake is in the late Wurm glaciation (MIS5b), Red Dune period is in the middle Wurm glaciation (MIS3), Yellow Dune is in the last glacial maximum (MIS2), and Modern Dune is in the Little Ice Age. This result accords with the research result of sandy hills of this area by other scientists and can be compared with the global change in stade since the last interglacial stage and show the change of winter monsoon in Poyang Lake area. |
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| Keywords: | Poyang Lake aeolian-dust deposit grain size analysis wind power |
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