间作及伴随阴离子肥料对油菜吸收积累镉的影响

Effects of intercropping and accompanying anion fertilizer on Cd uptake by Brassica campestris L.

  • 摘要: 为提高Cd污染土壤植物修复效率, 采用盆栽方法研究了Cd含量为10.0 mg·kg-1的土壤中, 伴随阴离子肥料和间作鹰嘴豆对油菜生长与吸收积累Cd的影响。结果表明: 单作下, 不同肥料处理土壤DTPA提取态Cd含量为Cl->NO3->SO42- >无伴随阴离子; 间作鹰嘴豆提高土壤DTPA提取态Cd含量, 且伴随C1-、SO42- 或NO3- 条件下达显著水平。单作下, 油菜主根长为NO3- >C1- >SO42- >无伴随阴离子, 根系体积为SO42->NO3- >C1- >无伴随阴离子, 根系活力NO3 >SO42 >Cl >无伴随阴离子; 间作鹰嘴豆在无肥处理下可显著提高油菜的主根长与根系体积, 在无肥处理、SO42- 、NO3- 处理下显著提高根系活力。单作下, 油菜地上部Cd含量表现为C1- >SO42- >NO3- >无伴随阴离子, 间作鹰嘴豆可显著降低无肥处理地上部Cd含量, 但显著提高施肥处理地上部的Cd含量。单作下, 施肥可显著增加油菜的Cd积累总量, 以伴随C1-处理最大, 达470.4 μg·plant-1; 间作鹰嘴豆也可提高油菜的Cd积累总量, 且伴随C1- 处理最大, 达783.7 μg·plant-1。除伴随C1- 处理外, 施肥处理均可显著提高油菜的Cd转移系数, 施肥处理的Cd转移系数均大于1; 间作鹰嘴豆也可提高油菜的Cd转移系数, 且施肥条件下达显著水平。因此, 如果把油菜用作Cd污染土壤植物修复作物, 可选择施用含Cl 肥料和间作鹰嘴豆, 以提高修复效率。

     

    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 C1- > NO3- > SO42- > non-accompanying anion. Intercropping with chickpea increased soil DPTA extractable Cd content, and the effects were significant under accompanying anion fertilizers of C1- , NO3- and SO42- . In monoculture rape system, the order of rape taproot length under different accompanying anion fertilizers was NO3- > C1- > SO42- > non-accompanying anion, that of rape root volume was SO42- > NO3- > C1- > non-accompanying anion, it was NO3- > SO42- > C1- > 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 SO42- , NO3- accompanying fertilizers. In monoculture rape system, accompanying anions fertilizers significantly increased rape shoot Cd content, with C1- accompanying fertilizer presented highest Cd content (470.4 μg·plant-1). Intercropping with chickpea increased rape shoot Cd content, especially under C1- accompanying fertilizer, which reached 783.7 μg·plant-1. The transfer coefficient of Cd was increased under SO42- , NO3- 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 C1- accompanying fertilizer with chickpea intercropping was a more effective measure for prompting remediation efficiency of Cd contaminated soils.

     

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