Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, PR China.
Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, PR China.
Environ Pollut. 2019 Dec;255(Pt 2):113252. doi: 10.1016/j.envpol.2019.113252. Epub 2019 Sep 17.
To develop a high efficient and eco-friendly approach to remediate cadmium (Cd) contaminated soil, we designed the activation and extraction systems, on the basis of combined effects between the ability of organic acids to activate Cd and the ability of mushroom accumulator (Lentinus edodes) to extract Cd. The results showed that the proportion of acetic acid-extractable Cd significant increased with the application of exogenous organic acids. Additionally, soil microecology analysis indicated that exogenous organic acids evidently enhanced the numbers of microbial cells and the activities of soil enzymes. Besides, high throughput sequencing analysis revealed exogenous organic acids improved the diversity and structure of soil bacterial community after remediation. Particularly, the combination application of mushroom and exogenous citric acid had highest accumulation efficiency of Cd, and its efficiency was 59.19% higher than single mushroom treatment. Hence, exogenous organic acids could alleviate soil microecology and increase mycoextraction efficiency, which suggested it was a feasible route to remediate Cd contaminated soil by the activation and extraction systems.
为开发一种高效且环保的方法来修复镉（Cd）污染土壤，我们设计了基于有机酸激活 Cd 的能力和蘑菇积累器（香菇）提取 Cd 的能力的组合效应的激活和提取系统。结果表明，随着外源有机酸的应用，乙酸可提取 Cd 的比例显著增加。此外，土壤微生态学分析表明，外源有机酸明显增加了微生物细胞的数量和土壤酶的活性。此外，高通量测序分析表明，外源有机酸在修复后改善了土壤细菌群落的多样性和结构。特别是，香菇和外源柠檬酸的组合应用对 Cd 的积累效率最高，其效率比单独使用香菇处理高 59.19%。因此，外源有机酸可以缓解土壤微生态并提高菌根提取效率，这表明通过激活和提取系统来修复 Cd 污染土壤是一种可行的方法。
