Abstract:
To explore more promising ways improving the efficiency of phytoremediation of cadmium (Cd) contaminated soils, a pot culture experiment was conducted to study the impacts of accompanying anion fertilizer and chickpea intercropping on rape growth, Cd uptake and accumulation in soils containing 10.0 mg·kg 1. The results showed that in monoculture rape system, the order of soil DPTA extractable Cd content under different accompanying anion fertilizers was C
1- > NO
3- > SO
42- > non-accompanying anion. Intercropping with chickpea increased soil DPTA extractable Cd content, and the effects were significant under accompanying anion fertilizers of C
1- , NO
3- and SO
42- . In monoculture rape system, the order of rape taproot length under different accompanying anion fertilizers was NO
3- > C
1- > SO
42- > non-accompanying anion, that of rape root volume was SO
42- > NO
3- > C
1- > non-accompanying anion, it was NO
3- > SO
42- > C
1- > non-accompanying anion for rape root activity. Intercropping with chickpea significantly increased rape taproot length and root volume under non-accompanying anion fertilizer, and increased root activity under non-accompanying anion fertilizer, and SO
42- , NO
3- accompanying fertilizers. In monoculture rape system, accompanying anions fertilizers significantly increased rape shoot Cd content, with C
1- accompanying fertilizer presented highest Cd content (470.4 μg·plant
-1). Intercropping with chickpea increased rape shoot Cd content, especially under C
1- accompanying fertilizer, which reached 783.7 μg·plant
-1. The transfer coefficient of Cd was increased under SO
42- , NO
3- accompanying fertilizers, and it was higher than 1 under all accompanying fertilizers in rape monoculture system. Intercropping with chickpea enhanced transfer coefficient under all accompanying fertilizers. Thus in using rape as phytoremediation plant, the application of C
1- accompanying fertilizer with chickpea intercropping was a more effective measure for prompting remediation efficiency of Cd contaminated soils.