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| Assessing producing environment and potential ecological risk of tea plantation in southern Shaanxi Province |
| Received:March 11, 2020 |
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| KeyWord:southern Shaanxi;tea plantation soil;tea leaves;producing environment;ecological risk |
| Author Name | Affiliation | E-mail | | ZHAO Zuo-ping | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | FU Jing | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | YUE Si-yu | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | WANG Meng | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | SONG Feng-min | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | LIU Zhi-feng | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | TANG Bo | College of Chemical and Environment Science, Shaanxi University of Technology, Hanzhong 723001, China
State Key Laboratory of Qinba Bio-Resource and Ecological Environment, Hanzhong 723001, China | | | TONG Yan-an | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | tongyanan@nwsuaf.edu.cn |
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| Abstract: |
| In order to assessed the producing environment and potential ecological risk of tea plantation soils in southern Shaanxi Province, a total of 330 topsoil samples were collected and analyzed for physico-chemical properties(pH, organic matter, available potassium, available phosphorus, nitrate, total nitrogen, cation exchange capacity)and thirteen mineral element concentrations(Pb, Zn, Cu, Cr, Hg, As, Cd, Ni, Se, Mn, Fe, V and Mg). And 33 leaves samples were collected and analyzed for seven mineral element concentrations(Pb, Cu, Cr, Hg, As, Cd and Se). Results showed that the physical and chemical index average content in soil fertility between the environment of green food quality Ⅱstandard range. The average concentration of Pb, Zn, Cu, Cr, Hg, As, Cd, Ni, Se, Mn, Fe, V and Mg in tea plantation soils were 10.03, 87.61, 16.42, 12.38, 0.20, 6.89, 0.11, 24.81, 625.20, 0.15, 40 291.61, 4 774.51 and 76.82 mg·kg-1, respectively. The coefficient of variation of the different elements ranged from 29.16% to 58.82%, and was 49.30% for Cd and 48.55% for Hg. In 5.76% and 4.54% of the samples, Cd concentrations and Ni concentrations exceeded the risk screening value of the Soil environmental quality Risk control standard for soil contamination of agricultural land(GB 15618-2018), respectively. The average comprehensive potential ecological risk index was 102.15, and the overall potential ecological risk was low. Cd and Hg contributed the most to the potential ecological risk(35.47% and 46.53%, respectively), and the risks associated with other elements were relatively minor. Thus, measures should be taken to control Cd and Hg soil pollution to ensure the safe production of tea in the study area. The heavy metals in tea leaf samples all conform to the relevant standards of pollution-free food tea. |
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