College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
J Hazard Mater. 2022 May 15;430:128345. doi: 10.1016/j.jhazmat.2022.128345. Epub 2022 Jan 24.
Cadmium (Cd) contamination in soil poses a serious threat to ecological environment and crop quality, especially under high nitrogen level. Here, the efficiency of composite organic amendment (spent mushroom substrate and its biochar) on remediation of Cd contaminated soil under high nitrogen level has been studied through a 42 days' soil incubation experiment. The results showed: (i) the application of composite organic amendment minimized the repercussions of high nitrogen and significantly reduced the exchangeable Cd proportion by 28.3%-29.5%, especially for Ca(NO) treatment; (ii) the application of composite organic amendment improved the physicochemical properties of soil, such as pH, CEC and organic matter content increased by 0.63-0.99 unit, 39.69%-45.00% and 7.77%-11.47%, and EC decreased by 16.21%-44.47% compared with non-amendment Cd-contaminated soil, respectively; (iii) the application of composite organic amendment significantly increased the soil enzyme activities and microbial biomass, among which urease activity was increased most by 12.06-16.42 mg·g·d, and the copy number of AOA was decreased by 30.6%- 92.0%, and the copy number of AOB was increased most by about 45 times. In brief, the composite organic amendment can alleviate the adverse effects of Cd and nitrogen on the soil, but its long-term efficacy needs to be verified in further field study.
土壤中的镉（Cd）污染对生态环境和作物质量构成了严重威胁，尤其是在高氮水平下。在这里，通过 42 天的土壤培养实验研究了复合有机改良剂（废弃蘑菇基质及其生物炭）对高氮水平下镉污染土壤的修复效率。结果表明：（i）复合有机改良剂的应用最大限度地减少了高氮的影响，并使可交换 Cd 的比例降低了 28.3%-29.5%，尤其是 Ca(NO)处理；（ii）复合有机改良剂改善了土壤的理化性质，例如 pH、CEC 和有机质含量分别增加了 0.63-0.99 个单位、39.69%-45.00%和 7.77%-11.47%，而 EC 则降低了 16.21%-44.47%与非改良镉污染土壤相比；（iii）复合有机改良剂显著增加了土壤酶活性和微生物生物量，其中脲酶活性增加了 12.06-16.42 mg·g·d，AOA 的拷贝数减少了 30.6%-92.0%，AOB 的拷贝数增加了最多约 45 倍。总之，复合有机改良剂可以减轻 Cd 和氮对土壤的不利影响，但需要在进一步的田间研究中验证其长期效果。
