镉钝化剂与尿素配施对土壤镉钝化效果的影响

发布时间：2018-02-27 22:52

本文关键词： 土壤镉污染钝化剂肥料　出处：《生态学杂志》2017年07期 　论文类型：期刊论文

【摘要】：以生物炭(B)、海泡石(S)和磷矿粉(P)为重金属镉钝化材料,研究它们与尿素配施对土壤重金属镉(Cd)钝化效果的影响,为重金属钝化专用肥的研制提供理论依据。结果表明:3种钝化剂经盐酸改性后,表面积和比表面积显著提高,吸附能力增强;与未添加钝化剂的处理相比,3种钝化剂的单一和复合处理均显著降低土壤活性Cd的含量(P0.05),其中海泡石与磷矿粉复合处理(S+P)降低幅度最大,活性Cd含量降低了23%;与单施尿素比,尿素与钝化剂配施能有效降低活性Cd含量,其中S+P处理钝化效果最好,钝化剂的添加能缓解由于尿素态氮转化带来的土壤酸化的趋势,提高土壤pH,在一定程度上降低Cd的有效性。本研究表明,在未来重金属钝化专用肥的研制中,酸改性磷矿粉和海泡石可作为重点关注的钝化材料。
[Abstract]:The effects of combined application of biochar, Sepiolite (S) and phosphate rock (P) as heavy metal cadmium passivating materials on soil heavy metal cadmium (CD) passivation were studied. The results showed that the surface area and specific surface area of the three kinds of passivating agents modified by hydrochloric acid were significantly increased and the adsorption capacity was enhanced. Compared with the treatment without passivating agent, the single and compound treatments of three passivating agents significantly reduced the content of soil active CD (P0.05N), and the Sepiolite and phosphate rock powder compound treatment decreased the content of active CD by 23%, compared with the single application of urea, the content of active CD decreased by 23%, compared with the treatment without adding passivating agent, the content of active CD decreased significantly in the treatment of sepiolite and phosphate rock powder. The combination of urea and passivating agent can effectively reduce the active CD content, among which S P treatment has the best passivation effect, and the addition of passivating agent can alleviate the trend of soil acidification caused by urea nitrogen conversion. This study showed that acid modified phosphate rock powder and sepiolite could be used as passivating materials in the future development of heavy metal passivation special fertilizer.
【作者单位】：中国科学院沈阳应用生态研究所;中国科学院大学;
【基金】：国家科技支撑计划课题(2015BAD05B03) 国家重点研发计划课题(2016YFD0300904)资助
【分类号】：TQ447;X53

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