| 近50年来抚仙湖重金属污染的沉积记录* |
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| 引用本文： | 曾海鳌,吴敬禄.近50年来抚仙湖重金属污染的沉积记录*[J].第四纪研究,2007,27(1):128-132. |
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| 作者姓名： | 曾海鳌 吴敬禄 |
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| 作者单位： | 1. 中国科学院南京地理与湖泊研究所,南京,210008;中国科学院研究生院,北京,100049
2. 中国科学院南京地理与湖泊研究所,南京,210008 |
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| 基金项目： | 国家自然科学基金
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国家重点基础研究发展计划(973计划) |
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| 摘 要： | 文章以抚仙湖污染严重的北部和基本未受人类活动影响的中部为研究对象,分别采集了沉积岩芯FB和FZ,通过对岩芯的137 Cs测年和重金属元素(Cu,Ni,Ti,Cr,V,Pb,Cd和Zn)的含量分析,研究了湖泊重金属来源和污染历史,并利用地质累积指数法评价了湖泊重金属污染程度。结果表明:抚仙湖北部的平均沉积速率约为2.0~2.8mm/a;20世纪80年代以前,湖泊北部和中部的重金属元素(Cu,Ni,Ti,V,Pb,Cd,Zn)以自然来源为主;80年代以后,抚仙湖受到人类活动的影响,但湖泊中部Cu,Ni,Ti,V,Pb,Zn以及湖泊北部Cu,Ni,Ti,V仍以自然来源为主;湖泊北部Pb和Zn地质累积指数值小于1,属无污染到中度污染;北部Cd地质累积指数为3~4,达强度污染;中部Cd地质累积指数为2~3,属中强度污染;且Pb,Zn和Cd污染程度有加速增大的趋势。
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| 关 键 词： | 抚仙湖 重金属 湖泊沉积物 地质累积指数 |
| 文章编号： | 1001-7410（2007）01-128-05 |
| 收稿时间： | 2006-04-02 |
| 修稿时间： | 2006-06-30 |
RECENT FIFTY-YEAR SEDIMENTARY RECORD OF HEAVY METAL POLLUTION IN THE FUXIAN LAKE |
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| Zeng Hai'ao,Wu Jinglu.RECENT FIFTY-YEAR SEDIMENTARY RECORD OF HEAVY METAL POLLUTION IN THE FUXIAN LAKE[J].Quaternary Sciences,2007,27(1):128-132. |
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| Authors: | Zeng Hai'ao Wu Jinglu |
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| Institution: | 1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008 ; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | The concentration of heavy metals in lake sediments has been an indicator of contamination level of water and can record the history of pollution. Fuxian Lake, the third deepest lake in China, has a long history of residence. Its water quality has been largely affected by industrialization, agricultural cultivation, and deforestation, particularly in recent 20 years. However, few studies have reported its environmental problems. This paper focused on the change of heavy metal concentration in sediments from the heavily polluted northern region (the FB core) and the less polluted middle area (the FZ core) of the Fuxian Lake respectively. Based on the analyses of 137 Cs activities and heavy metal (Cu, Ni, Ti, Cr, V, Pb, Cd and Zn) concentration-depth profiles from the cores, the sources and pollution history of heavy metals were investigated. The geo-accumulation index (Igeo) has been used to assess their contamination levels. 137 Cs dating showed that the mean sedimentation rates is 2.0~2.8mm/a in northern lake. Before the 1980s, the main sources of heavy metals(Cu, Ni, Ti, V, Pb, Cd and Zn)are natural. After the 1980s, despite being influenced by human activities, heavy metals (Cu, Ni, Ti, V, Pb, Cd and Zn) in middle lake as well as Cu, Ni, Ti and V in northern lake are still originated mainly from the nature, but the sources of Pb, Zn and Cd in northern lake are influenced by anthropogenic activities. The geo-accumulation indices (Igeo) revealed that Pb and Zn in northern lake were considered as "unpolluted to moderately polluted" (Igeo<1); Cd was "strongly polluted" (3<Igeo<4) in northern lake and "moderately to strongly polluted" (2<Igeo<3) in middle lake. It is obvious that the pollution of Pb, Zn and Cd has been increased since the 1980s. |
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| Keywords: | Fuxian Lake heavy metal lake sediment geo-accumulation index |
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