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The remediation effect of Robinia pseudoacacia L. intercropped with Solanum nigrum L. and Pteris vittate L. on Cd and As contaminated soil was studied through a pot experiment. The results showed that the intercropping of R. pseudoacacia L. could promote the growth and the uptake of Cd and As in S. nigrum L. and P. vittate L., and reduce the content of Cd and As in soil, as well as enhance soil enzyme activities. Compared with the monocultures of S. nigrum L. and P. vittate L., the whole biomass of S. nigrum L. and P. vittate L. was significantly enhanced（P<0.05）by 50.4% and 86.2% when intercropped with R. pseudoacacia L. Meanwhile, the contents of Cd and As in the leaves of S. nigrum L. were significantly enhanced（P<0.05）by 78.4% and 260.7%, respectively. The total accumulation of As in aboveground parts of all plants under the intercropping of R. pseudoacacia L. with S. nigrum L. and P. vittate L. was significantly enhanced（P<0.05）by 1.11 and 2.17 times compared with the monocultures of R. pseudoacacia L. or S. nigrum L., and the total accumulation of Cd was significantly enhanced（P<0.05）by 1.89 and 15.72 times compared with the monocultures of R. pseudoacacia L. or P. vittate L. Moreover, the contents of available Cd and As in soil under the intercropping of R. pseudoacacia L. with two hyperaccumulators were significantly reduced（P<0.05）by 23.6% and 17.0% compared with the control, respectively. Meanwhile, the contents of soil organic matter and alkaline hydrolysis nitrogen were significantly enhanced（P<0.05）by 46.2%~83.2% and 18.5%~26.4% as compared with the monocultures, the activities of soil catalase was significantly enhanced（P<0.05）by 43.7%~53.0% compared with the monocultures of R. pseudoacacia L. or P. vittate L., the soil sucrase and urease activities were also significantly enhanced（P<0.05）by 11.5%~28.4% and 20.6%~36.4% compared with the monocultures of R. pseudoacacia L. and S. nigrum L., respectively. The results suggested that the intercropping of R. pseudoacacia L. with two different types of hyperaccumulator could effectively uptake and accumulate Cd and As to reduce the bioavailability of Cd and As in the contaminated soil, and effectively improve the soil environmental quality, which could be considered as a promising intercropping model for the simultaneous remediation of Cd and As contaminated soil in mining areas.
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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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