The effect of different passivation agents on the accumulation of heavy metals in Morchella
A deactivator was applied to the soil of Morchella cultivation in the experimental site,and the changes in soil pH,total ni-trogen and protein content,total potassium content,and Pb and Cd content before and after the growth of Morchella were analyzed,the effects of different treatments on the total nitrogen and protein content,total potassium,and the absorption of heavy metal Pb and Cd in Morchella were compared.The results indicated that,compared with no passivation agent,all treatments could increase soil pH.With the increase of the content of quicklime and hydroxyapatite,the soil pH increased by 0.15%～17.17%and 8.05%～14.89%respec-tively compared to the control.The soil treated with quicklime and sepiolite showed a certain degree of increase in total nitrogen and protein content,but the soil treated with organic bentonite and hydroxyapatite had no significant effect on total nitrogen and protein content.After adding a deactivator,the total nitrogen content of Morchella slightly increased compared to when no deactivator was add-ed,but the increase was not significant.Compared with CK,the total potassium in the soil slightly increased after the application of the additive,but the change was not significant;the passivation agent had little effect on the total potassium content of Morchella.Whether before or after the growth of Morchella,the addition of four deactivators,namely quicklime,hydroxyapatite,sepiolite,and or-ganic bentonite,could reduce the content of Pb and Cd in soil.When the addition of four deactivators was 0.016%,the total Pb con-tent in the soil before the growth of Morchella decreased by 91.84%,91.24%,76.94%and 10.32%compared to the control.The effect of soil treated with passivators on the Pb of Morchella was more significant than that of Cd.The comprehensive analysis indicated that the application of four additives could greatly reduce soil Pb and Cd and effectively control the enrichment of Pb and Cd by Morchella,while having little effect on conventional soil physical and chemical indicators.The four additives had certain application value for the control of soil heavy metal pollution in the cultivation area of Morchella.
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