湖南镉污染农田土壤钝化后两个品种水稻的生长效应

发布时间：2018-11-15 11:35

【摘要】：采用盆栽试验,考察镉污染农田土壤在添加不同含量ME钝化剂的条件下,不同品种水稻中镉分布规律及水稻生长效应。结果表明,添加ME钝化剂能提高土壤pH值,降低土壤中镉有效态含量,表现为分蘖期,湘晚籼13和岳优712品种土壤有效态镉质量比与空白比较分别降低了10%~13%和24.3%~45.7%;成熟期与空白比较分别降低了6.8%~15%和11.5%~21.8%。添加ME钝化剂能明显降低水稻植株、稻壳及糙米中镉质量比,湘晚籼13品种最大降幅分别为78.6%、80.9%及46.8%;岳优712品种最大降幅分别为59.2%、64.7%及79.5%。岳优712品种糙米中镉富集系数低于湘晚籼13品种。综合ME钝化剂对土壤有效态镉的钝化效果、水稻吸收重金属的抑制效应及水稻的生长效应,初步确定0.5%(质量分数)ME钝化剂处理优于1%。
[Abstract]:Pot experiment was conducted to investigate the distribution of cadmium in different varieties of rice and the effect of rice growth under the condition of adding different amounts of ME passivating agent in cadmium contaminated farmland soil. The results showed that the addition of ME passivating agent could increase the pH value of soil and decrease the content of available cadmium in soil, which appeared at tillering stage. The mass ratio of available cadmium in Xianglen-indica 13 and Yueyou 712 was decreased by 10% and 24. 3%, respectively, compared with that of blank, and the ratio of available cadmium decreased by 10% and 24. 3%, respectively. The maturation period decreased by 6. 8% and 11. 5% and 21. 8%, respectively. The addition of ME passivating agent could significantly reduce the mass ratio of cadmium in rice, rice husk and brown rice. The largest decrease of CD content in Xiang-late indica rice variety was 78.6% and 46.8%, respectively. The biggest decrease of Yueyou 712 was 59.2% and 79.5%, respectively. The CD enrichment coefficient in brown rice of Yueyou 712 was lower than that of Hunan late indica rice 13. Considering the passivation effect of ME passivator on soil available cadmium, the inhibition effect of heavy metal absorption by rice and the growth effect of rice, it was preliminarily determined that 0.5% (mass fraction) ME passivator treatment was better than 1%.
【作者单位】：湖南农业大学资源环境学院;湖南现代环境科技股份有限公司;
【基金】：环保公益性行业科研专项(201509032)
【分类号】：X53;S511

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