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| Effects of different amendments on cadmium immobilization in naturally selenium-enriched and highcadmium soil |
| Received:February 17, 2025 |
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| KeyWord:selenium-rich and high-cadmium soil;combined application;cadmium immobilization;amendments;pakchoi |
| Author Name | Affiliation | E-mail | | SHI Jingyi | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | REN Rongxin | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHAO Wanchen | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | WU Hao | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHOU Fei | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | QI Mingxing | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LIANG Dongli | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | dlliang@nwsuaf.edu.cn |
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| Abstract: |
| To investigate the effects of different amendments on cadmium（Cd）immobilization in high-Cd soils from naturally selenium （Se）-enriched areas, this study took pakchoi（Brassica rapa）as the research object and used biochar and calcium magnesium phosphate fertilizer as amendments, and explored the effects of single and combined applications on Cd uptake, translocation in pakchoi, and soil Cd fraction transformation through potting experiment. Compared to the control, all amendment treatments increased plant height, root length, and underground biomass of pakchoi by 3.04%-11.14%、8.77%-23.07% and 10.42%-58.33% respectively. Except for the single application of biochar treatment, other amendments significantly enhanced aboveground dry weight by 8.23%-17.95%. Both amendments elevated the activities of peroxidase（POD）and catalase（CAT）, with the combined high-dose biochar and phosphate fertilizer treatment showing the most pronounced effect：POD and CAT activities reached 1.42 times and 1.73 times higher than the control, respectively. Concurrently, the content of malondialdehyde（MDA）was decreased from the control treatment by 9.68%-38.03%. All treatments reduced Cd concentrations in both shoots and roots. The combined high-dose biochar and phosphate fertilizer treatment decreased the Cd concentrations 13.99% in shoots and 30.28% in roots. Compared with the pre-seeding period, the amendments decreased the proportion of exchangeable Cd 4.01%-12.55% and increased residual Cd 5.76%-23.23%, indicating Cd stabilization via fraction transformation. In this study, Cd was effectively immobilized by the combined application of biochar and calcium magnesium phosphate fertilizer. However, truly solving the problem of Cd over accumulation in plants from Se-enriched and high-Cd soils requires integrated approaches with additional remediation measures. |
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