【摘要】 [目的]研究钝化管控技术对重度镉污染稻田的修复效果和水稻生长效应。[方法]选取湖南省镉污染稻田作为案例地,并对其进行污染特征分析、风险评价,采用钝化技术对其进行管控,最后对该管控技术进行分析与评价。[结果]采用钝化管控技术能使土壤pH显著提高,水稻稻米中镉含量显著降低,稻米中镉降低29.45%～37.5%;能促进水稻生长并具有增产效果,增产2.51%～6.31%。[结论]结合水稻生长和稻米镉含量的降低率以及钝化剂成本看,钝化剂的最佳添加量为3 000 kg/hm~2。更多还原

【Abstract】 [Objective]To study the effect of remediation on passivator and rice growth in a case of cadmium contaminated rice field in Hunan Province.[Method]Through the analysis of pollution characteristics of the case,passivation technology was used to control the risk assessment,finally,the results of the control technology were analyzed and evaluated.[Result]The passivation control technology could significantly increase the soil pH,significantly reduce the cadmium content in rice,and reduce the cadmium content in rice by 29.45%-37.5%.It could promote the growth of rice and increase the yield,which was 2.51%-6.31%.[Conclusion]Considering the growth rate of rice,the reduction rate of cadmium content in rice and the cost of passivating agent,the optimal addition amount of passivating agent in this case study was 3 000 kg/hm~2.更多还原