三峡库区典型支流库湾消落带沉积泥沙特征及重金属评价
Characteristics of Deposited Sediment and Assessment of Heavy Metals in Typical Tributaries Bay Riparian Zone of the Three Gorges Reservoir
查看参考文献28篇
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文摘
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为了分析三峡库区支流消落带沉积泥沙的理化特征以及重金属污染的空间变化特征,选择9条典型一级支流,共采集54个消落带沉积泥沙样品,测定了粒径分布、 容重、 有机质(TOC)、 总氮(TN)、 总磷(TP)、 钾(K)等养分元素含量特征以及运用地累积指数评价铬(Cr)、 铜(Cu)、 镍(Ni)、 铅(Pb)、 锌(Zn)等重金属. 结果表明消落带沉积泥沙粒径分布在空间上(乌江-磨刀溪)中值粒径呈波动变化; 支流消落带下部(160~165 m)沉积泥沙相比上部(165~175 m)偏粗,不同高程带砂粒和黏粒体积分数变化属于中等变异,粉粒属于弱变异. 独立样本t检验表明消落带上部和下部之间沉积泥沙特征差异不显著. 地累积指数评价表明支流消落带沉积泥沙只有Zn元素在珍溪河、 龙洞河和龙河属于无-中的污染程度,Pb元素在磨刀溪属于无-中的污染程度,其他元素在所选支流消落带均为无污染. |
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其他语种文摘
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In order to analyze the spatial variation characteristics of grain diameter, nutrient elements and heavy metal pollution with deposition sediment in tributaries bay of the Three Gorges Reservoir, we selected 9 typical tributaries bay, 54 deposited sediment samples were collected from the riparian zone for analyzing grain diameter distribution, capacity, organic matter, nutrient elements of TN, TP and K, heavy metal elements of Cr, Cu, Ni, Pb, and Zn. The results indicated that particle size distribution from Wujiang River in Fuling to the Modao stream in Yunyang presented a trend of fluctuation, deposited sediment at 160-165 m elevation was coarser than that at 165-175 m elevation,volume percent of sand and clay presented a moderate variation at both altitudes, while silt had small variation. Independent sample t test showed that characteristics difference between the upper and lower sediments in riparian zone was not significant. The geo-accumulation index of heavy metal pollutants in the sediment from riparian zone of the Three Gorges Reservoir tributaries bay indicated that, only Zn element in Zhenxi River, Longdong River and Long River, Pb element in the Modao Stream belonged to non-moderate pollution levels, whereas there were no pollution of all other elements in tributaries. |
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来源
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环境科学
,2016,37(3):935-941 【核心库】
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DOI
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10.13227/j.hjkx.2016.03.018
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关键词
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支流库湾
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沉积泥沙
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理化性质
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重金属
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三峡库区
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地址
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中国科学院成都山地灾害与环境研究所, 中国科学院山地表生过程与生态调控重点实验室, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0250-3301 |
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学科
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环境科学基础理论;环境污染及其防治 |
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基金
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国家自然科学基金重点项目
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中国科学院知识创新工程西部行动计划项目
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文献收藏号
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CSCD:5650297
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