SUN Simiao,WANG Xiaojun,GU Xuejia,et al.Effects of Amendments on Cadmium Adsorption Capacity of Soil and Growth of Brassica rapa L.[J].HEILONGJIANG AGRICULTURAL SCIENCES,2024,(09):25-34.[doi:10.11942/j.issn1002-2767.2024.09.0025]
改良剂对土壤镉吸附能力和小白菜生长的影响
- Title:
- Effects of Amendments on Cadmium Adsorption Capacity of Soil and Growth of Brassica rapa L.
- 文章编号:
- 4
- Keywords:
- peat diatom amendment; biochar; steel slag; adsorption; cadmium; soil remediation
- 文献标志码:
- A
- 摘要:
- 为探究泥炭硅藻改良剂、牡蛎钙、生物炭和钢渣的吸附特征以及对镉（Cd）污染下小白菜生长性状的影响,通过吸附试验研究时间、浓度及投入量对改良剂吸附溶液中Cd的影响，并通过室内试验，研究在Cd污染下不同改良剂对小白菜生长、Cd浓度、根际土壤全量和有效态Cd浓度的影响。结果表明，（1）准二级动力学模型、Langmuir模型和颗粒内扩散模型更符合改良剂对Cd的吸附过程，钢渣和生物炭具有较好的吸附性能，当投入量>1.0 g时，二者对Cd的去除率均为99.0%以上；（2）施用改良剂均显著促进小白菜生长，与CK对比，4个处理干重分别增加了63.82%、42.38%、98.45%和30.23%，其中生物炭的促生效果最显著；改良剂促进Cd在根部富集并向地上部转运，钢渣的转运作用最显著，转运系数（TF）达到1.84；（3）泥炭硅藻改良剂显著降低根际土壤全Cd浓度，与对照相比降低了16.72%，并降低了潜在生态风险。钢渣能显著降低根际土壤有效态Cd浓度，与对照相比降低了56.91%，显著提高根际土壤pH，达到7.96。研究表明，钢渣具有良好的吸附Cd的性能，泥炭硅藻改良剂的综合改良效果最好。
- Abstract:
- In order to investigate the adsorption characteristics of peat diatom amendments, oyster calcium, biochar, and steel slag, as well as their differential effects on the growth characteristics of Brassica rapa under cadmium (Cd) pollution. Through adsorption experiments, the effects of time, concentration, and input amounton the adsorption of Cd by amendments in solution were studied. Through indoor experiments, the effects of different amendments on the growth, Cd concentration, total amount of rhizosphere soil, and effectiveCd concentration of Chinese cabbage under Cd pollution were studied. The results showed that: (1) thequasi-second order kinetic model, Langmuir model, and intra-particle diffusion model were more in line with the adsorption process of the modifier for Cd. Steel slag and biochar had good adsorption performance. When the input amount was >1.0 g, their removal rates for Cd were both above 99.0%; (2) The application of ameliorants significantly promoted the growth of bok choy. Compared to the CK group, the dry meight of the four treatments increased by 63.82%, 42.38%, 98.45%, and 30.23%, respectively, with biochar showingthe most pronounced growth-promoting effect. The ameliorants facilitated the enrichment of Cd in the roots and its translocation to the above-ground parts, among which biochar had the most significant growth-promoting effect, and steel slag had the most pronounced translocation effect, TF reaching 1.84; (3) The peat diatom amendment significantly reduced the total Cd concentration in rhizosphere soil, which decreased by 16.72%compared to the control group and reduced potential ecological risks. Steel slag significantly reduced the effective Cd concentration in the rhizosphere soil, which decreased by 56.91% compared to the control group, and significantly increased the pH of the rhizosphere soil, reaching 7.96. Studies have shown that steel slag has good adsorption performance for Cd, and the comprehensive improvement effect of peat diatom ameliorantis the best.
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备注/Memo
收稿日期：2024-06-14