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Chinese Agricultural Science Bulletin ›› 2018, Vol. 34 ›› Issue (29): 82-91.doi: 10.11924/j.issn.1000-6850.casb17090012

Special Issue: 土壤重金属污染 园艺

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Evaluation of Soil Quality and Heavy Metal Safety in Tea Garden of 13 Towns in Yingde, Guangdong

  

  • Received:2017-09-04 Revised:2018-09-18 Accepted:2017-10-25 Online:2018-10-15 Published:2018-10-15

Abstract: To investigate soil quality and heavy metal safety in tea growing areas in Yingde, Guangdong, the authors collected 76 tea garden soil samples from 13 towns and measured soil pH value, fertility index and 6 kinds of heavy metals included chromium, copper, lead, arsenic, cadmium and mercury according to national standards, and further evaluated the heavy metal safety. The results showed that there were 10 areas which had the phenomenon of acidification or basification, accounting for 13.15% of the total soil samples; among those samples, Shakou and Yunling samples were acidated, Dawan, Shigutang and Shihuipu samples were alkalized. The analysis of soil fertility showed that most samples located in the lower position of ± 2, relatively concentrated, indicating that the majority of Yingde tea garden soil had lower fertility. According to single heavy metal pollution index (Pi ), arsenic pollution index of 9.21% soil samples exceeded the standard, Hg and Cr pollution index of 1.31% soil samples exceeded the standard. The comprehensive pollution indexes (P ) of most soil samples were less than 0.70, which were at safe level. Heavy metal pollution of 3.95% soil samples (Wangfu, Shihuipu and Yinghong) reached the alert level; and 1.31% (Donghua) was in light pollution grade. The study shows that soil in Yingde is in lower fertility, with the phenomenon of acidification and basification, and a small amount of tea garden soil has heavy metal pollution.

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