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Cl、SO42或NO3条件下达显著水平。单作下,油菜主根长为NO3>Cl>SO42>无伴随阴离子,根系体积为SO42>NO3>Cl>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Cl>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Cl处理最大,达470.4μg·plant 1;间作鹰嘴豆也可提高油菜的Cd积累总量,且伴随Cl处理最大,达783.7μg·plant 1。除伴随Cl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。
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^- 〉 804^2- 〉 non-accompanying anion. Intercropping with chickpea increased soil DPTA extractable Cd content, and the effects were significant under accompanying anion fertilizers of CI^-, NO3^- and SO42^-. In monoculture rape system, the order of rape taproot length under different accompanying anion fertilizers was NO3^- 〉 C1^- 〉 SP4^2- 〉 non-accompanying anion, that of rape root volume was SO4^2- 〉 NO3^- 〉 C1^- 〉 non-accompanying anion, it was NO^-3 〉 SO4^2- 〉 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 SO4^2-, NO^3- accompanying fertilizers. In monoculture rape system, accompanying anions fertilizers significantly increased rape shoot Cd content, with C1^- accompanying fertilizer presented highest Cd content （470.4μtg.plant^-1）. Intercropping with chickpea increased rape shoot Cd content, especially under C1^- accompanying fertilizer, which reached 783.7 μtg.plant^-1. The transfer coefficient of Cd was increased under SO4^2-, 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 effectivemeasure for prompting remediation efficiency of Cd contaminated soils.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2013年第10期1264-1270,共7页
Chinese Journal of Eco-Agriculture
关键词
镉
间作
伴随阴离子
油菜
鹰嘴豆
Cadmium, Intercropping, Accompanying anion, Oilseed rape, Chickpea
