镉氮交互作用对小白菜生长及其体内镉累积的影响

采用温室盆栽试验,研究了镉氮交互作用对小白菜植株的干重和镉累积的影响。结果表明:在试验范围内,土壤施氮显著改善小白菜植株的生长状况,土壤镉污染水平对小白菜植株地上部分和根系干重的影响差异不显著。土壤镉污染显著导致镉在植株体内的累积,镉污染水平对小白菜植株镉浓度和镉累积量的影响差异显著。施氮条件下植株镉浓度的变化趋势因土壤镉污染水平不同而异,施氮在促进生长的同时,在一定程度上也促进了植株对镉的吸收和累积。植株地上部镉累积明显大于根系镉累积,且土壤外源镉污染水平下小白菜植株没有表现出镉毒害症状,说明小白菜植株地上部具有耐镉并累积镉的特性。

Interactive effects of nitrogen application and cadmium contamination on Pakchoi growth and Cd accumulation

Soil Cd pollution has negative effect on eco-environment as well as agricultural production.Loess soil was used to investigate the interactive effects of nitrogen application and cadmium contamination on dry weight and cadmium content in the shoot and root of Pakchoi in a greenhouse pot experiment.The results showed that Pakchoi growth status was significantly improved with the increase of nitrogen to loess soil in all cadmium treatments,while Pakchoi's dry weight was not significantly affected by soil cadmium contamination in any nitrogen treatments.Cadmium concentration and accumulation in the shoot and root were significantly increased with the increase of cadmium,changes in cadmium concentration in the shoot and root of Pakchoi with the increase of nitrogen was different with cadmium treatments,Pakchoi growth as well as cadmium accumulation was increased with the increase of nitrogen application.Cadmium accumulation in shoot of Pakchoi was greater than that in root of Pakchoi and there are not obvious toxic symptom appeared in the plant of Pakchoi,it indicated that the shoot of Pakchoi has the characteristic of both tolerating and accumulating cadmium from the soil.The results may be instructive in providing theoretical foundation for the prevention of cadmium contamination in vegetables.