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• 研究报告 • 上一篇    下一篇

镉钝化剂与尿素配施对土壤镉钝化效果的影响

于春晓1,2,张丽莉1*,杨立杰1,2,李东坡1,武开阔1,2,崔亚兰1,2,薛妍1,2,武志杰1#br#   

  1. (1中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院大学, 北京 100049)
  • 出版日期:2017-07-10 发布日期:2017-07-10

Effects of passivators and urea on soil Cd availability.

YU Chun-xiao1,2, ZHANG Li-li1*, YANG Li-jie1,2, LI Dong-po1, WU Kai-kuo1,2, CUI Ya-lan1,2, XUE Yan1,2, WU Zhi-jie1#br#   

  1. (1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China).
  • Online:2017-07-10 Published:2017-07-10

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(P<0.05),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。

关键词: 可溶性有机质, 隔离降雨, 增温

Abstract: In the current research, an incubation experiment was conducted to test the passivation effect of biochar (B), sepiolite (S) and phosphorite (P) in combination of urea application on cadmium (Cd) availability in order to explore the effective materials for the development of Cdpassivation fertilizers. The results showed that surface area, specific surface area and functional group of passivators B, S and P were all increased after acid modification. Compared to the treatments without application of passivators, all the treatments with application of passivators alone or in combination decreased available Cd content, among which, S+P exhibited the best passivation effect, and available Cd content decreased by 23%. Compared to the application of urea alone, the application of urea combined with passivators decreased available Cd content and S+P treatment showed the best effect. Passivator addition can alleviate soil acidification caused by the ureaN transformation, increase the soil pH, and reduce the availability of Cd to a certain extent. The results suggest that acid modified P and S can be used in the development of new type toxic metalpassivation fertilizers.

Key words: dissolved organic matter, precipitation exclusion, warming