Effects of planting years and cultivation methods on heavy metal accumulation in vegetable soil
WANG Su-ping, DU Lei, GUO Cui-ying, HUANG Xiang, ZHANG Gui-you, HONG Juan, LIAN Zhi-cheng, JIANG Li, ZHANG Li-hong, YE Li-xia, CHEN Gang
2020, 59(24):
88-91.
doi:10.14088/j.cnki.issn0439-8114.2020.24.018
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In order to study the effects of different planting years and cultivation methods on the accumulation of heavy metals and their bioavailability, the contents and bioavailability coefficients of 8 heavy metals (As, Cd, Cr, Cu, Ni, Pb, Zn, Hg) in vegetable soil with planting years less than 5, 5~10, 10~15 years and 15~20 years were studied. At the same time the content of heavy metals and bioavailability coefficient of soil under open and protected cultivation were analyzed. The results showed that the content of As, Cd, Ni and Pb increased with the increase of planting years, the effective state content and bioavailability of Cd, Cr, Cu, Pb and Zn were the highest and biggest in 10~15 years, the content of As, Cd, Hg and Ni was higher culture in open field than in the greenhouse soil, the content of Cr, Cu, Pb and Zn was higher culture in greenhouse soil than in open field. The bioavailability coefficient of Ni elements culture in the open field was higher than that in the greenhouse soil, and that of As, Cr, Cd, Cu, Hg, Pb, Zn elements culture in the greenhouse soil was higher than that in the open field. The average contents of As, Cr, Cu, Pb and Zn in the soil planted with leafy vegetables were higher than those with fruits, fruits and rhizomes. The average content of Hg was the highest in the soil planted with melons and fruits, and the average contents of Cd and Ni were the highest in the soil planted with rhizome vegetables.
