Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (18): 75-84.doi: 10.11924/j.issn.1000-6850.casb2020-0387

Special Issue: 土壤重金属污染 资源与环境 园艺

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Evaluation and Source Analysis of Soil Potential Toxic Elements Pollution in Tea Garden in Yibin City

Cheng Qiangqiang1,2(), Wang Zhe1,2,3(), Yi Facheng1,2, Sun Qing1,2, Zhang Yiping1,2, Jiang Hu1,2, Wang Chengxia1,2   

  1. 1College of Environment and Resources, Southwest University of Science and Technology, Mianyang Sichuan 621010
    2Key Laboratory of Solid Waste Treatment and Recycling, Ministry of Education, Mianyang Sichuan 621010
    3School of Earth and Space Science, University of Science and Technology of China, Hefei 230026
  • Received:2020-08-21 Revised:2020-12-18 Online:2021-06-25 Published:2021-07-13
  • Contact: Wang Zhe E-mail:chengqq1996@126.com;wz2004@126.com

Abstract:

To reveal the current status and source of PTEs pollution in tea garden soil in Pingshan County, Yibin City, through the collection and detection of samples, the pollution assessment of 7 potentially toxic elements (PTEs) (Cd, As, Cr, Cu, Pb, Zn, Ni) was carried out by using the Nemerow index, geo-accumulation index and potential ecological risk index, and the source analysis was conducted by multivariate statistics and spatial analysis. The results showed that among the concentrations of the 7 PTEs, only Cd exceeded the screening value of agricultural land in the tea garden soil. Compared with the soil background value in Sichuan Province, the Cd over-standard rate was 88.45 times, and the average value of Nemerow pollution index, geo-accumulated pollution index and comprehensive potential ecological pollution risk index was 7.65, 3.38 and 1262.06 respectively, indicating that tea garden soil was seriously polluted, and the potentially ecological risk was high. Multivariate statistics and pollution spatial analysis showed that the enrichment of Cd, Cr, Ni and Zn might be caused by pyrite mining; Pb was mainly caused by the large-scale use of coal in the mining and smelting of pyrite. In addition to burning coal, As was also related to the use of fertilizers; the early generation of the paper mills along the Xiaolongxi caused Cu enrichment in the river and acidification of the surrounding soil in the study area. The spatial distribution characteristics of PTEs pollution indicated that Cd was the main source of risk, which had a controlling effect on PTEs pollution in tea garden soil in Yibin.

Key words: tea plantations, potentially toxic elements, Nemerow index, geo-accumulation index, potential ecological risk index, multivariate analysis, spatial analysis

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