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| Content Provider | frontiers |
|---|---|
| Author | Wang, Luyao Liu, Siqi Li, Jianfeng Li, Shunqi |
| Description | Soil heavy metal pollution has become a major ecological and environmental problem and a serious threat to global food security. Organic fertilizer can not only improve soil quality and provide nutrients for plants but also reduce the harm of heavy metal ions to a certain extent, meaning it has become a current research hotspot in the field of heavy metal passivation. In this paper, a completely combined experimental design was used to compare the effects of five organic fertilizers [nutshell organic fertilizer (NOF), pig manure organic fertilizer (PMOF), sludge organic fertilizer (SOF), humus soil organic fertilizer (HSOF) and earthworm soil organic fertilizer (ESOF)] on available Cd in soil with different pollution levels at different dosages, and the passivation mechanism of soil Cd was preliminarily discussed. The results showed that all kinds of organic fertilizers were passivated by reducing the Cd availability, and their effects on the Cd availability of purple soil were closely related to the degree of soil pollution and the amount of organic fertilizers. The passivation effect of moderate Cd-contaminated soil was the best, which increased with the increase of organic fertilizer application rate, and the effects of NOF and SOF were the best. However, the passivation effect of organic fertilizers on soil Cd was the worst in mild Cd-contaminated soil, especially ESOF. The results of Cd morphological correlation analysis showed that Exe-Cd and FeMnOx-Cd in the soil ha... |
| Abstract | In order to explore the passivation effect and influence mechanism of different organic fertilizers on Cd in purple soil, the complete combination design was used to compare the effects of five organic fertilizers (nutshell organic fertilizer (NOF), pig manure organic fertilizer (PMOF), sludge organic fertilizer (SOF), humus soil organic fertilizer (HSOF) and earthworm soil organic fertilizer(ESOF) ) on available Cd in soil with different pollution levels at different dosages, and the relationship between the change of available Cd in soil and the transformation of Cd forms was discussed. The results showed that all kinds of organic fertilizers could effectively reduce the effectiveness of Cd in moderate and severe Cd-contaminated soil to achieve the purpose of passivation, and the passivation effect increased with the increase of organic fertilizer application rate, and the effective Cd content decreased by 9.09%~47.27% compared with the control. However, in mild Cd-contaminated soil, organic fertilizer could only reduce the effective Cd content under high dosage (8 g/kg). After the addition of organic fertilizer, the content of available Cd in soil decreased first and then increased over time, reaching the lowest value at 15 d and tended to be stable after 60 d. The change dynamics were consistent with the transformation dynamics of Cd forms. In addition, the results of Cd morphological correlation analysis showed that Exe-Cd and FeMnOx-Cd in soil had significantly positive contributions to available Cd, while Res-Cd showed significantly negative contributions. Organic fertilizer significantly reduced the contents of Exe-Cd and FeMnOx-Cd by increasing Res-Cd content, which significantly reduced the availability of Cd in soil. |
| ISSN | 2296665X |
| DOI | 10.3389/fenvs.2022.895646 |
| Volume Number | 10 |
| Journal | Frontiers in Environmental Science |
| Language | English |
| Publisher Date | 2022-07-22 |
| Access Restriction | Open |
| Subject Keyword | Cd Availability Heavy metals speciation Passivation Organic fertilizer |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Science |
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