| 从沉积物组成变化看三峡水库蓄水对大宁河沉积环境的影响 |
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| 引用本文： | 王勇,李红春,罗尚德,郭芳旭,蔡金郎,王津.从沉积物组成变化看三峡水库蓄水对大宁河沉积环境的影响[J].中国岩溶,2008,27(1):32-37. |
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| 作者姓名： | 王勇 李红春 罗尚德 郭芳旭 蔡金郎 王津 |
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| 作者单位： | 1.西南大学地理科学学院 |
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| 基金项目： | 国家自然科学基金
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重庆市院士专项
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西南大学校科研和教改项目 |
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| 摘 要： | 对2006年10月采自长江重要支流大宁河中上游河底沉积物约42cm长的岩芯样品进行X射线衍射（XRD）、总碳（TC）和有机碳（TOC）分析。实验结果表明:（1）该研究时段内沉积物中主要的矿物类型是石英和方解石，总碳含量为33～57g／kg，有机碳含量为8～34g／kg；（2）沉积剖面中总碳和有机碳含量从10cm深的部位向岩芯顶部都发生了急剧的下降，沉积物颜色也在此处由灰色转为红褐色，这可能反映了三峡水库蓄水后，在较低的流速状态下，原来处于位置较高、含碳较低的褐红色粘土受水体淹没并被大量输入河流沉积物中，从而引起了泥沙沉积速率的迅速增加；（3）双龙沉积剖面中有机碳的变化结果还显示，在17～10cm深处沉积物有机碳含量大幅度增加，可能是本区域内该时段人类活动引起有机物质急剧输入到河流中的反映。
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| 关 键 词： | 沉积物 总碳含量 有机碳含量 矿物成分 三峡水库 大宁河 |
| 文章编号： | 1001-4810(2008)01-0032-06 |
| 收稿时间： | 2007/8/25 0:00:00 |
| 修稿时间： | 2007年8月25日 |
Impact on the Daning river sedimental environment by Three Gorge Reservoir in view of changes in sediment compositions |
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| WANG Yong,LI Hong-chun,LUO Shang-de,GUO Fang-xu,CAI Jin-lang and WANG Jin.Impact on the Daning river sedimental environment by Three Gorge Reservoir in view of changes in sediment compositions[J].Carsologica Sinica,2008,27(1):32-37. |
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| Authors: | WANG Yong LI Hong-chun LUO Shang-de GUO Fang-xu CAI Jin-lang and WANG Jin |
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| Institution: | 1.School of Geographical Sciences, Southwest China University2.School of Geographical Sciences, Southwest China University;National Chengkung University3.National Chengkung University4.Sun Yat-sen University of Taiwan5.School of Environmental Science and Engineering, Guangzhou University |
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| Abstract: | This study shows the results of analysis to X-ray diffraction （XRD）, total carbon （TC） and the total organic carbon （TOC） contents of fluvial sediment core nearly 42cm long collected from the Daning river. Three primary results are concluded: （1） The XRD results indicate that quartz and calcite are the dominant minerals in the sediment. The TC and TOC contents range from 33 to 57g/kg and from 8 to 34g/kg, respectively. （2） From 10cm deep toward the core top both TC and TOC continuously decrease and the sediment become brown color. The Three Gorge Reservoir may elevate water level and leads to dramatic increase in input of brownish low carbon content clay sediment into the Daning river. Then the sediment rate of the Daning river will be increased dramatically by this mechanism. （3） From 10 to 17 cm deep in Shuanglong profile, TOC content in the sediment dramatic increase may be resulted from intensive human activities which lead more organic matter input into the Daning river.. |
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| Keywords: | sediment total carbon content total organic carbon content mineral composition the Three Gorge Reservoir the Daning river |
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