【摘要】 为探究硫酸亚铁对六价铬[Cr（Ⅵ）]污染条件下水稻幼苗铬吸收、积累的影响，采用土壤盆栽的方法，基于同一重铬酸钾（K₂Cr₂O₇）含量基础上添加不同含量梯度的FeSO₄·7H₂O,共设置6个处理[分别为CK（FeSO₄·7H₂O添加量为0 mg/kg）、T1（FeSO₄·7H₂O添加量为40 mg/kg）、T2（FeSO₄·7H₂O添加量为80 mg/kg）、T3（FeSO₄·7H₂O添加量为120 mg/kg）、T4（FeSO₄·7H₂O添加量为160 mg/kg）、T5（FeSO₄·7H₂O添加量为200 mg/kg）],研究FeSO₄·7H₂O对铬污染条件下水稻幼苗的生长、铬吸收状况及抗氧化系统的影响。结果表明，T3处理、T5处理茎叶鲜重和根系鲜重显著高于CK（P<0.05）;添加FeSO₄·7H₂O后，水稻地上部和根系的铬含量显著下降（P<0.05）。FeSO₄·7H₂O可以显著降低土壤Cr（Ⅵ）含量（P<0.05）;此外，施用适量FeSO₄·7H₂O能有效提高土壤脲酶和土壤过氧化氢酶的活性以及水稻过氧化物酶（POD）和谷胱甘肽S转移酶（GST）的活性。总之，施用适量硫酸亚铁能够提高水稻抗氧化酶的活性，增强水稻对铬胁迫的耐受性，增加水稻幼苗的生物量，减少土壤和水稻中Cr（Ⅵ）的含量，减轻Cr（Ⅵ）对水稻的毒害作用。更多还原

【Abstract】 In order to explore the effect of ferrous sulfate on the absorption and accumulation of chromium in rice seedlings under Cr（Ⅵ） pollution conditions, the method of soil potting was adopted. Based on the same potassium dichromate（K₂Cr₂O₇） content, different content gradients of FeSO₄·7H₂O were added. A total of six treatments were set up, namely CK（with an addition of FeSO₄·7H₂O of 0 mg/kg）, T1（with an addition of FeSO₄·7H₂O of 40 mg/kg）, T2（with an addition of FeSO₄·7H₂O of 80 mg/kg）, and T3（with an addition of FeSO₄·7H₂O of 120 mg/kg）, T4（with an addition of FeSO₄·7H₂O of 160 mg/kg）, and T5（with an addition of FeSO₄·7H₂O of 200 mg/kg）, to investigate the influence of FeSO₄·7H₂O on the growth, chromium uptake and the antioxidant system of rice seedlings under chromium stress. The results showed that the fresh weights of stems, leaves and roots in treatments T3 and T5 were significantly higher than those in CK（P<0.05）. After the addition of FeSO₄·7H₂O, the chromium content in the aboveground and root systems of rice decreased significantly（P<0.05）. Addition of FeSO₄·7H₂O could significantly reduce the Cr（Ⅵ） content in soil（P<0.05）. In addition, the application of an appropriate amount of FeSO₄·7H₂O could effectively enhance the activities of soil urease and soil catalase, as well as the activities of rice peroxidase（POD） and glutathione S-transferase（GST）. In conclusion, the application of appropriate ferrous sulfate can enhance the activity of antioxidant enzymes in rice, strengthen its resistance to chromium stress, increase the biomass of rice seedlings, reduce the content of Cr（Ⅵ） in the soil and rice, and alleviate the toxic effects of Cr（Ⅵ） on rice.更多还原