Effects of Heavy Metals on Ammonification,Nitrification and Denitrification in Maize Rhizosphere

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Effects of Heavy Metals on Ammonification,Nitrification and Denitrification in Maize Rhizosphere

机译：重金属对玉米根际氨化，硝化和反硝化的影响

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The amrnonification,nitrification and denitrification in maize rhizosphere of alluvial soils were compared with those in the bulk soil after exposure to different kinds of heavy metals.The addition of cadmium at low levels (2 mg kg-1 and 5 mg kg-1) could stimulate the arnmonification and nitrification in the soils,while inhibition influences were found at high levels of Cd addition (10 mg kg-1 and 20 mg kg-1).The relationship between microbial activity and cadmium concentration varied with the kind of microorganisms.The nitrifying bacteria were more sensitive to cadmium pollution than the armonifying bacteria.When Cd(II),Cu(II) and Cr(VI) were compared at the same addition concentration of 20 mg kg-1 soil,Cd(II) was the most effective inhibitor of amronification and denitrification among the three investigated heavy metals,and Cr(VI) had the most strong inhibitory influence on the nitrifying bacteria.The microbial activities in rhizosphere were higher than those in the bulk soil for most of the treatments.Cr(VI) proved to be the most effective in enhancing the microbial activities in rhizosphere,and this could be caused by the positive reduction of Cr(VI) to Cr(III) in rhizosphere,and the relatively sufficient existence of organic matter which intensified the adsorption of the metal.It seemed that the rhizosphere had some mitigation effect on heavy metal toxicity.

机译：比较了不同重金属暴露条件下，冲积土壤玉米根际的氨化，反硝化和反硝化作用。添加低浓度的镉（2 mg kg-1和5 mg kg-1）可以分别在10 mg kg-1和20 mg kg-1的高水平添加Cd时，可以刺激土壤中的氨化和硝化作用，而抑制作用受到影响。微生物活性和镉浓度之间的关系随微生物的种类而变化。硝化细菌对镉污染的敏感程度要高于军械细菌。当在相同的20 mg kg-1土壤中添加Cd（II），Cu（II）和Cr（VI）时，Cd（II）最多在研究的三种重金属中，氨化和反硝化的有效抑制剂，Cr（VI）对硝化细菌的抑制作用最强。根际微生物活性高于块状土壤中的钼。事实证明，Cr（VI）是最有效的增强根际微生物活性的方法，这可能是由于根际中Cr（VI）积极还原为Cr（III）以及存在相对充足而引起的。看来，根际对重金属的毒性有一定的缓解作用。

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《土壤圈（英文版）》 |2001年第2期|115-122|共8页
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Department of Environmental Engineering,Zhejiang University,;

Department of Environmental Engineering,Zhejiang University,;

Department of Environmental Engineering,Zhejiang University,;

Department of Environmental Engineering,Zhejiang University,;

Department of Environmental Engineering,Zhejiang University of Technology,;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类土壤学;
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Effects of Heavy Metals on Ammonification,Nitrification and Denitrification in Maize Rhizosphere

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