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The effect of composite passivators on the in-situ Cd contaminated soil and its absorption and accumulation of Cd in cabbage were explored, which would provide a scientific basis for the treatment and restoration of medium and mild Cd contaminated farmland. Field experiments were carried out in Cd polluted farmland soil with five passivator combinations: red mud + lime + phosphate rock powder (T1), red mud + lime + biochar (T2), lime + humic acid + sepiolite (T3), sepiolite + biochar + red mud (T4), sepiolite + biochar + phosphate rock powder (T5), in order to study the effects of the five passivating agent combinations on the content of various forms of Cd, enzyme activity, microbial carbon (MBC), microbial nitrogen (MBN) and the absorption and accumulation of Cd in various parts of Chinese cabbage in the cultivated layered soil. The five compound passivating agents could improve soil pH and reduce the availability of Cd in the soil in different degrees. Soil pH in T3, T4 and T5 treatments was significantly higher than that in CK, and soil available Cd content in T2, T3, T4 and T5 treatments was significantly lower than that in CK. In each form of Cd, in T5 treatment, the content of Cd in weak acid extraction state and reducible state was significantly higher than that in CK, while the content of Cd in residue state was significantly lower than that in CK. Compared with CK, T1, T3, T4 and T5 treatments significantly increased soil sucrase and acid phosphatase activities by 42.06%-152.46% and 15.95%-26.48%, respectively. Treatments T1, T2, T3 and T4 significantly increased urease activity by 18.43%-35.19%, treatments T3 and T4 significantly increased catalase activity by 18.78%-19.01%, treatments T1, T2 and T3 significantly increased soil MBC content by 31.83%-53.19%. T2, T3 and T4 treatments significantly increased soil MBN content by 19.14%-59.89%. Different treatments had different effects on Cd absorption and accumulation in different parts of Chinese cabbage. Compared with CK, T4 and T5 treatments significantly reduced Cd content in roots, T1, T4 and T5 treatments significantly reduced Cd content in stems, and the five treatments significantly reduced Cd content in leaves, and the enrichment and transport capacity of Cd in leaves of Chinese cabbage was greater than that in stems and roots. In terms of comprehensive passivation effect, T4 and T5 treatments, namely sepiolite + biochar + red mud (3∶5∶3), sepiolite + biochar + phosphate powder (3∶5∶3), had better passivation effect in the field soil mildly polluted by Cd during in-situ passivation restoration, which could effectively reduce the absorption of heavy metal Cd in soil by plants.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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