Liu De-Ling, Yin Guang-Cai, Chen Zhi-Liang, Lin Qin-Tie, Liu Qian-Jun, Zhong Song-Xiong, Huang Ling, Zhang Jian-Qiang
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China.
Huan Jing Ke Xue. 2018 Jun 8;39(6):2927-2935. doi: 10.13227/j.hjkx.201709178.
The safety of vegetable production is a key link in reducing cadmium consumption through the food chains. Field experiments were conducted to investigate the effects of composite materials (calcium silicate-biological humus fertilizer) on the growth of shallots and the uptake of Cd by shallots from contaminated agricultural soil. Four treatments (T1: 0.5% calcium silicate+0.5% biological humus fertilizer; T2: 0.5% calcium silicate+1.0% biological humus fertilizer; T3: 1.0% calcium silicate+0.5% biological humus fertilizer; and T4: 1.0% calcium silicate+1.0% biological humus fertilizer) and a control group (CK) were adopted. The changes in soil pH, DTPA-extractable Cd, biomass of shallots, and cadmium concentrations in shallots over time under different treatments were analyzed. The results show that the application of composite amendments decreased the concentrations of DTPA-extractable Cd in the soil. In particular, after T3 treatment, the concentrations of soil DTPA-extractable Cd decreased by 60.71%, 49.54%, 44.63%, and 58.94% after 14, 28, 42, and 56 d, respectively. The biomass of the shallots aboveground increased significantly by 107.99% and 107.19% after T3 and T4 treatment, respectively. The composite amendments exhibited different effects on the uptake of Cd by the shallots from the soil, and the T4 treatment was the most effective in immobilizing Cd and inhibiting translocation of Cd into the shallots. The cadmium concentration in the shallots decreased by 43.80% after 56 d with the T4 treatment. In conclusion, T4 is the optimum treatment for soil cadmium immobilization.
蔬菜生产安全是通过食物链减少镉摄入的关键环节。开展田间试验，研究复合材料（硅酸钙 - 生物腐殖酸肥）对香葱生长以及香葱从污染农田土壤中吸收镉的影响。采用了四个处理组（T1：0.5%硅酸钙 + 0.5%生物腐殖酸肥；T2：0.5%硅酸钙 + 1.0%生物腐殖酸肥；T3：1.0%硅酸钙 + 0.5%生物腐殖酸肥；T4：1.0%硅酸钙 + 1.0%生物腐殖酸肥）和一个对照组（CK）。分析了不同处理下土壤pH值、DTPA可提取态镉、香葱生物量以及香葱中镉浓度随时间的变化。结果表明，施用复合改良剂降低了土壤中DTPA可提取态镉的浓度。特别是T3处理后，14、28、42和56 d时土壤DTPA可提取态镉浓度分别降低了60.71%、49.54%、44.63%和58.94%。T3和T4处理后，香葱地上部生物量分别显著增加了107.99%和107.19%。复合改良剂对香葱从土壤中吸收镉表现出不同影响，T4处理在固定镉和抑制镉向香葱体内转运方面效果最佳。T4处理56 d后，香葱中镉浓度降低了43.80%。总之，T4是土壤镉固定的最佳处理。
