Combined Effects of Biochar-Sedum plumbizincicola on Cadmium Concentration in Cd-Contaminated Limestone Soil and Cadmium Absorption in Lactuca sativa

• Published in: Water, air, and soil pollution air, and soil pollution, 2023-02, Vol.234 (2), p.73, Article 73
• Main Authors: Liu, Ying-Ying, Luo, Wen-Min, Mu, Gui-Ting, Wu, Xian-Liang, Zhang, Zhen-Ming
• Format: Article
• Language: English
• Subjects: Absorption; Agricultural practices; Atmospheric Protection/Air Quality Control/Air Pollution; Biomass; Cadmium; Charcoal; Climate Change/Climate Change Impacts; Continuous cropping; Earth and Environmental Science; Efficiency; Environment; Environmental monitoring; Experiments; Hydrogeology; Intercropping; Lactuca sativa; Limestone; Monoculture; Pollution; Sedum plumbizincicola; Soil; Soil contamination; Soil investigations; Soil pollution; Soil remediation; Soil Science & Conservation; Water Quality/Water Pollution
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-023-06098-x

This study aimed to explore the possibility of “repairing while producing” Cd-contaminated limestone soil and to investigate the combined effect of biochar- Sedum plumbizincicola. A pot experiment was conducted to examine the effect of Cd-contaminated limestone soil remediation and Cd absorption by Lactuca sativa. Six treatments were examined: monocropping of Lactuca sativa and intercropping of Lactuca sativa with Sedum plumbizincicola in Cd-contaminated limestone soil with 0, 4%, and 10% biochar addition. The results showed that under the same biochar treatment, the biomass accumulation of Lactuca sativa under monoculture was 14.41%, 18.18%, and 42.83% higher than that under intercropping, respectively, but the differences were not significant; when 4% biochar was added, the concentration of Cd in the soil was significantly reduced. When 4% and 10% biochar were added, the Cd concentration under monoculture decreased by 45.42% and 158.75%, respectively, while the Cd concentration under intercropping decreased by 82.06% and 185.10%, respectively; the concentration of soil total Cd under intercropping was lower than that under monoculture, decreasing by 8.78%, 17.17%, and 36.61%, respectively. Biochar combined with Sedum plumbizincicola is a feasible strategy that can not only effectively reduce the concentration of Cd in Lactuca sativa but also enable the remediation of Cd-polluted soil.