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| Chemical mechanisms of three alkaline materials for remediation of cadmium pollution in dryland soils of Yunnan Province |
| Received:September 02, 2024 |
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| KeyWord:alkaline materials;silicate-calcium powder;Yunnan dryland;dissolved organic matter;cadmium pollution remediation |
| Author Name | Affiliation | E-mail | | CAI Cheng | State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LIANG Ting | State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHOU Guopeng | Anhui Province Key Lab of Farmland Ecological Conservation and Nutrient Utilization, Anhui Province Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | CHANG Danna | State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | MA Zhengbo | State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | GAO Songjuan | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | FU Libo | Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Sciences, Kunming 650205, China | | | CAO Weidong | State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | caoweidong@caas.cn |
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| Abstract: |
| In order to choose the passivation materials to mitigate the pollution of Cd, a pot experiment with four treatments of blank control （CK）, application of hydrated lime（HL）, application of calcium-magnesium-phosphorus fertilizer（CMP）and application of silicatecalcium powder（SC）were conducted to investigate the effects of three alkaline passivation materials on the chemical structure of soil DOM, the availability of soil Cd and the Cd concentration of Lactuca sativa L. The results showed that the SC treatment had the lowest aboveground Cd concentration and Cd translocation factor, with decreases of 38.8% and 30.4%. Compared with CK, HL, CMP and SC treatments reduced the availability of soil Cd and the soil available Cd concentration reduced by 11.2%, 26.7% and 17.9%, exchangeable Cd by 15.5%, 14.9% and 28.1%, and residual Cd by 21.0%, 33.1% and 24.2%, respectively. Three passivation materials treatments increased soil pH significantly by 0.53, 0.74 and 0.36 units, respectively, compared to CK. Moreover, application of the three alkaline materials significantly increased soil DOM content, humin-like fractions and fulvic-like fractions, while the tryptophan-like substances significantly decreased compared to CK. Correlation analysis and aggregated boosted tree analysis showed that soil pH was significantly and negatively correlated with soil DOM content, soil DOM content, humin-like fractions and fulvic-like fractions were the three most critical factors affecting Cd concentration in the aboveground Cd concentration. In conclusion, the three alkaline materials may reduce the availability of soil Cd and inhibit the uptake and translocation of Cd in Lactuca sativa L. by increasing the soil pH and changing the content and spectral characteristics of the soil DOM, among which the combined effect of silica-calcium mineral powder is more prominent. |
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