State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China.
J Hazard Mater. 2023 Jun 5;451:131205. doi: 10.1016/j.jhazmat.2023.131205. Epub 2023 Mar 13.
Metals pollution of lead in agricultural soils is a serious problem for food safety. Therefore, we investigated the toxic effects of carbonate-bound fraction Pb on agricultural soil from various aspects. The results revealed that a higher carbonate-bound fraction of Pb had more toxic effects on wheat growth, as evidenced by higher malondialdehyde (3.17 μmol g FW) and lower catalase levels (9.77 μg FW min). In terms of nutrient cycling, soil nutrients including carbon, nitrogen, and phosphorus would slow down transformation rates in high concentrations. Compared to carbon, nitrogen and phosphorus were more likely to be affected by the initial carbonate-bound fraction at the earlier stage. Increased Pb dosage may reduce the soil enzymes activity such as urease (119-50 U g) and phosphatase (3191-967 U g), as well as the functional genes of nitrogen degradation related nirK, nisS, and carbon related pmoA. Correlation analysis and structural equation modeling indicated that carbonate bound Pb could regulate nutrients cycle via functional genes inhibition, soil enzyme activity reduction and wheat growth suppression in agricultural soil. Our findings will help with polluted agricultural soil monitoring and regulation through microbial activity to ensure food safety.
农田土壤中铅的金属污染对食品安全是一个严重的问题。因此，我们从多个方面研究了碳酸盐结合态 Pb 对农业土壤的毒害作用。结果表明，较高的碳酸盐结合态 Pb 对小麦生长的毒害作用更大，表现为较高的丙二醛（3.17 μmol g FW）和较低的过氧化氢酶水平（9.77 μg FW min）。在养分循环方面，包括碳、氮和磷在内的土壤养分在高浓度下会减缓转化速率。与碳相比，氮和磷在早期更有可能受到初始碳酸盐结合态的影响。增加 Pb 用量可能会降低土壤酶活性，如脲酶（119-50 U g）和磷酸酶（3191-967 U g），以及与氮降解相关的 nirK、nisS 和与碳相关的 pmoA 的功能基因。相关分析和结构方程模型表明，碳酸盐结合态 Pb 可以通过抑制功能基因、降低土壤酶活性和抑制小麦生长来调节农业土壤中的养分循环。我们的研究结果将有助于通过微生物活性监测和调控污染农田土壤，以确保食品安全。
