| 广西梧州六堡茶主产区茶叶-土壤重金属污染现状及源解析 |
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| 引用本文： | 彭学锐,周思裕,陈翔,陈琮友.广西梧州六堡茶主产区茶叶-土壤重金属污染现状及源解析[J].农业环境科学学报,2023,42(10):2231-2243. |
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| 作者姓名： | 彭学锐 周思裕 陈翔 陈琮友 |
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| 作者单位： | 广西壮族自治区二七〇地质队, 广西 柳州 545005 |
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| 基金项目： | 广西科技重大专项（AA20302018-7）；广西地质矿产勘查开发局科研项目（桂地矿综研〔2021〕19号） |
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| 摘 要： | 为探讨广西梧州六堡茶主产区茶叶及土壤重金属污染现状和来源，于2021年7—9月期间采集该区域六堡茶叶及根系土样品各45个，测定其中As、Cd、Cr、Cu、Hg、Ni、Pb、Zn 8种重金属含量，并基于单因子污染指数法、内梅罗综合污染指数法对土壤重金属污染现状进行评价，应用因子分析和正定矩阵因子分解法对土壤重金属来源进行研究，应用相关性分析等研究茶叶对土壤重金属的继承性。结果表明： Pb、Zn、Cd含量高值区主要聚集于铅锌矿开采区附近，西南部Hg元素含量整体上高于东北部，Cr、Ni、Cu的高含量区域出现在研究区西南部和东北部，As高含量区域则主要出现在研究区西部；茶园土壤存在As、Cd超标，超标率分别为6.67%、2.22%；土壤重金属来源于矿业活动、成土母质、化石燃料燃烧、农业活动，其贡献率分别为32.80%、28.86%、19.50%、18.84%。茶叶中重金属含量未发现超标情况；茶叶对Cd、Zn、Cu、Ni具有相对较高的生物富集系数，其中茶叶中的Cd主要来源于土壤，因此应该关注外界输入到茶园土壤中的Cd元素。
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| 关 键 词： | 土壤 六堡茶 重金属 污染现状 源解析 |
| 收稿时间： | 2023/3/10 0:00:00 |
Pollution status and source analysis of heavy metals in tea and soils in the main Liubao tea production area of Wuzhou, Guangxi |
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| PENG Xuerui,ZHOU Siyu,CHEN Xiang,CHEN Congyou.Pollution status and source analysis of heavy metals in tea and soils in the main Liubao tea production area of Wuzhou, Guangxi[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2023,42(10):2231-2243. |
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| Authors: | PENG Xuerui ZHOU Siyu CHEN Xiang CHEN Congyou |
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| Affiliation: | No. 270 Geological Team of Guangxi Zhuang Autonomous Region, Liuzhou 545005, China |
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| Abstract: | To examine the pollution status and sources of heavy metals in tea and soil in the Liubao tea growing areas of Wuzhou, Guangxi, we collected 45 samples of tea and the corresponding rhizosphere soils from July to September 2021 and determined the presence of eight heavy metal elements(As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn)in these samples. On the basis of single factor index analysis and the Nemerow comprehensive pollution index method, we evaluated the pollution status of heavy metals in the soil. Factor analysis and positive matrix factorization were applied to analyze the sources of heavy metals in soils, and correlation analysis and bioconcentration factors were used to assess the effect of soil-borne heavy metals on tea. The results revealed that areas in which soil contained high Pb, Zn, and Cd contents were mainly in the vicinity of a lead-zinc mine located in the study area. The content of Hg was found to be higher in the southwest than in the northeast of the study area; whereas high content areas of Cr, Ni, and Cu were detected in the southwest and northeast, and areas with high contents of soil-borne Hg were located in the west of the study area. As and Cd in tea garden soil were found to exceed the corresponding standards by 6.67% and 2.22%, respectively. We established that the heavy metals in soil were derived from mining activities, soil parent materials, fossil fuel combustion, and agricultural activities, with respective percentage contributions of 32.80%, 28.86%, 19.50%, and 18.84%, respectively. Analysis of tea samples indicated that the content of heavy metals in tea did not exceed the respective standards. Among the eight assessed heavy metals, tea showed a higher bioaccumulation of soil-borne Cd, Zn, Cu, and Ni. Given that the Cd content in tea is mainly derived from the soil, we should pay particular attention to Cd imported into tea garden soil from external sources. |
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| Keywords: | soil Liubao tea heavy metals pollution status source analysis |
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