Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (32): 108-115.doi: 10.11924/j.issn.1000-6850.casb2021-0306

Special Issue: 土壤重金属污染 园艺

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Pollution Characteristics and Potential Risk Assessment of Heavy Metals in Tea Garden Soil Treated with Soil Conditioning Powder

Liu Xiaolan1(), Wei Fuxiao1, Wang Daoping1, Zhang Qinghai2, Lin Shaoxia1(), Pan Weidong1, Wang Ruoyan3,4   

  1. 1Guizhou Medical University/The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang 550014
    2Guizhou Medical University, Guiyang 550025
    3Zunyi Jinxi Agricultural Technology Co., Ltd., Zunyi 563000, Guizhou
    4Guizhou University of Traditional Chinese Medicine, Guiyang 550025
  • Received:2021-03-23 Revised:2021-08-05 Online:2021-11-15 Published:2022-01-07
  • Contact: Lin Shaoxia E-mail:952741179@qq.com;442377310@qq.com

Abstract:

In this paper, the characteristics of heavy metal content and pollution level of “waterfall Maofeng” tea garden soil under different soil conditioning powder treatments in Anshun, Guizhou Province were studied by means of sample test and physical and chemical analysis. The heavy metal content and pollution level of tea garden soil under CK treatment (0 kg/hm 2), A treatment (600 kg/hm2), B treatment (750 kg/hm2) and C treatment (900 kg/hm2) were discussed. The results showed that: under different soil conditioning powder treatments, the variation degree of heavy metal Cr, Hg, Pb, Cu, Zn, Ni, As and Cd in the study area were different, and the content of the eight heavy metals in the soil were also different. The pH and content of Cr, Pb and Ni were the highest in treatment C, the content of As, Hg and Cd were the highest in treatment A, and the content of Cu and Zn were the highest in treatment B. Correlation analysis showed that there was a significant correlation between Ni and Pb, indicating that they had high level of homology, while the correlation characteristics of other elements were not obvious. According to the comprehensive pollution index (P), treatment A was slightly polluted, CK, B and C were all moderately polluted. Cr in different soil treatments were within the scope of national class II standard (GB15618—2008), and the sample points were up to the standard and the rate was 100%. Among the selected pollution assessment factors, Cu was the most important factor, followed by Cd and Ni. As to the single potential ecological risk index ($E_{r}^{i}$) of heavy metals in the study area, Hg belonged to strong ecological risk, and the other seven heavy metals were in slight potential ecological risk level. The average value of the comprehensive potential ecological risk index (RI) was 196.79, which was generally at the level of medium potential ecological risk. Hg contributed the most to RI and was the most important ecological risk element.

Key words: soil conditioning powder, tea garden, heavy metals, pollution assessment, ecological risk assessment

CLC Number: