Effects of different forms of nitrogen fertilizers on arsenic uptake by rice plants

被引:90
作者
Chen, Xue-Ping [1 ]
Zhu, Yong-Guan [1 ,2 ]
Hong, Mi-Na [3 ]
Kappler, Andreas [4 ]
Xu, Yu-Xin [3 ]
机构
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
[2] Chinese Acad Sci, Inst Urban Environm, Xiamen 361003, Peoples R China
[3] Shanxi Agr Univ, Coll Environm & Resource, Tai An 271018, Peoples R China
[4] Univ Tubingen, Ctr Appl Geosci, Geomicrobiol Grp, D-72076 Tubingen, Germany
关键词
nitrate-dependent iron oxidation; iron plaque; most probable number; arsenic; paddy soil;
D O I
10.1897/07-368.1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A pot microcosm experiment was conducted to investigate the effect of different forms of N fertilizers on As uptake by rice. Compared to a nontreated control, addition of nitrate reduced Fe(II) concentration in soil solution, while treatment with ammonium enhanced Fe(Ill) reduction, probably coupled to NH4+ oxidation in the nonrhizosphere. Most-probable-number (MPN) enumerations revealed high densities of nitrate-dependent Fe(II)-oxidizing microorganisms. The addition of nitrate decreased Fe plaque formation on the root surface, accompanied by much lower dissolved Fe(II) concentrations in the rhizosphere soil solution compared to the nonamended control. Nitrate addition also reduced As uptake by the rice plant. These results suggest that nitrate may inhibit Fe(III) reduction and/or stimulate nitrate-dependent Fe(II) oxidation, leading to As coprecipitation with, or adsorption to, Fe(III) minerals in the soil. Although Fe plaque formation on the root surface is reduced, nitrate-dependent stimulation of Fe(II) oxidation and/or inhibition of Fe(III) reduction in the bulk soil sequesters mobile As in the soil, resulting in reduced As uptake by rice.
引用
收藏
页码:881 / 887
页数:7
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