土壤重金属污染修复剂在镉污染稻田中的应用效果

Application Effect of Repair Agent of Heavy Metal Pollution in Cadmium Polluted Paddy Field

采用田间小区试验,在典型的镉污染稻区长沙县江背镇、北山镇开展了重金属修复剂"镉康"的田间应用效果试验。结果表明,修复剂"镉康"对水稻增产有一定的促进作用,但不同处理间没有显著差异。施用修复剂能够降低水稻各部位对镉(Cd)的积累,降低土壤有效Cd的含量,且随着修复剂用量的增加,降镉的效果越明显。江背镇、北山镇施用量分别达450 kg/hm2、600 kg/hm2时,降镉效果达显著水平。施用修复剂1 500 kg/hm2可使糙米镉含量降低约0.05 mg/kg,同时,土壤有效Cd含量降低0.17 mg/kg(江背镇)和0.64 mg/kg(北山镇)。

Field experiments were carried out to study the effect of ＂Gekang＂ repair agent of heavy metal pollution on the rice yield and cadmium contents in rice and soil in typical cadmium pollution paddy field, which located at Jiangbei and Beishan of Changsha County.The results showed that the repair agent increased the yield of rice, while there was no significant difference among the treatments. Repair agent decreased the accumulation of cadmium in brown rice, stem and leaf of rice, and reduced the available cadmium of soil at same time.The effecst of reducing cadmium was positively correlated with the dosage of repair agent. While the amount of repair agent in Jiangbei and Beishan reached 450 kg/hm^2 and 600 kg/hm^2, respectively, the cadmium reduction effect was significant. While application of repair agent by 1 500 kg/hm^2 reduced the cadmium content 0.05 mg/kg in brown rice, and available cadmium contents 0.17 mg/kg and 0.64 mg/kg in soil of Jiangbei and Beishan, respectively.