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| Zoning of cadmium and lead pollution for the safe production of facility leafy vegetables in northeast China |
| Received:March 20, 2020 |
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| KeyWord:facility leafy vegetables;zoning for safe production;cadmium;lead;species sensitivity distribution method |
| Author Name | Affiliation | E-mail | | LI Xiang | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | LONG Zhen-hua | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | ZHU Yan-yan | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | YANG Yi | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | | | LI Ming-tang | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China | limtdoc2008@163.com |
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| Abstract: |
| The rapid development of the facility vegetable planting industry in northeast China has led to different levels of cadmium(Cd) and lead(Pb)pollution in the soil, which has affected the safe production of vegetables. Based on the protection of 90% and 5% of vegetable varieties, the safe production zoning of Cd and Pb contaminated vegetable soil was studied using the species sensitivity distribution method. The results showed that the Cd and Pb in vegetables were 23.53% and 20.59% higher than that of the standard rates, respectively. There was a significant negative correlation between the enrichment coefficient of Cd in vegetables and soil pH(P<0.05), while there was a significant negative correlation between the enrichment coefficient of Pb in vegetables and the soil organic matter content (P<0.05). Spinach and pakchoi had a strong ability to accumulate Cd, whereas Indian lettuce vegetable had a weak ability to accumulate Cd. Pakchoi and leek had a strong ability to accumulate Pb, whereas chrysanthemum had a weak ability to accumulate Pb. The study suggested that the Cd content in the soil for the suitable, limited and forbidden production zones of facility leafy vegetables was ≤ 0.43 mg·kg-1, 0.43~2.88 mg·kg-1, and ≥ 2.88 mg·kg-1, respectively, whereas the Pb content for those zones in the soil was ≤ 24.21 mg·kg-1, 24.21~392.31 mg·kg-1, and ≥ 392.31 mg·kg-1, respectively. The absorption and accumulation characteristics of Cd and Pb in facility leafy vegetables were different, and there were obvious differences among vegetable samples. Therefore, the division of suitable, limited and forbidden production areas is of great significance for the safe production of Cd and Pb contaminated facility vegetable soil. |
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