College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China; College of Biology and Agriculture, Jiamusi University, Jiamusi, 154002, China.
College of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China.
Environ Res. 2024 Apr 15;247:118194. doi: 10.1016/j.envres.2024.118194. Epub 2024 Jan 14.
To attenuate the risk of Cadmium(Cd) contamination and the deterioration of soil quality caused by excessive nitrogen fertilizer application in greenhouse, a composite organic amendment (spend mushroom substrate and its biochar) was prepared to remedy Cd(II) ions contaminated soil (0.6 mg/kg) under different N fertilizer levels. The results showed that in the absence of a composite organic amendment, the soil pH decreased by 0.15 when the N level increased from 0.1 to 0.8 g N⋅kg. However, the pH increased by 0.86-0.91, the exchangeable Cd(II) ions content decreased by 26.0%-26.7%, the microbial biomass increased by 34.34%-164.46%, and the number of copies of the AOB gene increased by 13-20 times with the application of composite organic amendment and the increase of N level. Both Pearson correlation analysis and Mantel test demonstrated the reduction in Cd(II) ions availability, the restoration of soil properties and the increase in microbial biomass all contributed to the composite organic amendment, which is of importance for soil remediation under excessive N fertilizer.
为了减轻过量施氮引起的温室土壤镉（Cd）污染和土壤质量恶化的风险，制备了一种复合有机改良剂（蘑菇渣基质及其生物炭），以修复不同施氮水平下被 Cd(II)离子污染的土壤（0.6mg/kg）。结果表明，在没有复合有机改良剂的情况下，当氮水平从 0.1 增加到 0.8gN·kg 时，土壤 pH 值下降了 0.15。然而，随着复合有机改良剂的施用和氮水平的增加，土壤 pH 值增加了 0.86-0.91，可交换的 Cd(II)离子含量减少了 26.0%-26.7%，微生物生物量增加了 34.34%-164.46%，AOB 基因的拷贝数增加了 13-20 倍。皮尔逊相关分析和 Mantel 检验都表明，Cd(II)离子有效性的降低、土壤性质的恢复和微生物生物量的增加都归因于复合有机改良剂，这对过量施氮下的土壤修复具有重要意义。
