不同钝化处理与叶面阻控剂对Cd污染稻田的修复效果

Effects of different passivation treatments and foliar blocking agents on remediation of Cd-contaminated rice fields

在湖北省荆州市松滋市纸厂河镇受Cd污染地区开展大田试验,分析不同钝化处理与叶面阻控剂对土壤中pH、有效Cd及糙米中Cd含量的影响。结果表明,不同处理能够在一定程度上提高土壤pH(0.16%~6.06%),降低土壤中有效Cd含量,与对照相比,土壤有效Cd含量降低了3.57%~33.33%。叶面阻控剂对土壤pH和有效Cd含量无显著影响,但能有效抑制Cd在水稻植株内的转运,降低糙米中Cd含量。土壤调理剂、重金属钝化剂能够适当调节土壤pH,降低土壤有效Cd含量,进而降低水稻对Cd的吸收。3 750 mL/hm2叶面阻控剂+1 200 kg/hm2土壤调理剂+1 200 kg/hm2重金属钝化剂处理效果最好,糙米中Cd含量最低,土壤中有效Cd和糙米中Cd含量分别下降了33.33%、44.95%。

Field experiments were carried out in the Cd polluted area of Zhichanghe Town of Songzi City,Jingzhou City,Hubei Prov⁃ince,and analyze the effects of different passivation treatments and foliar blocking agents on soil pH,available Cd and Cd content in brown rice were analyzed.The results showed that different treatments could increase soil pH(0.16%~6.06%)to some extent and de⁃crease the content of available Cd in soil.Compared with the control,the content of available Cd in soil decreased by 3.57%~33.33%.Foliar blocking agents had no significant effect on soil pH and available Cd content,but could effectively inhibit Cd transport in rice and reduce Cd content in brown rice.Soil conditioner and heavy metal passivator could regulate soil pH properly and reduce the con⁃tent of available Cd in soil,and then reduce the absorption of Cd by rice.3750 mL/hm2 foliar blocking agents+1200 kg/hm2 soil con⁃ditioner+1200 kg/hm2 heavy metal passivator had the best treatment effect.The Cd content in brown rice was the lowest,and the Cd content in soil and brown rice decreased by 33.33%and 44.95%,respectively.