| 摘要: |
| 以水稻土土壤浸提液作微生物接种液，人工合成的Fe（OH）3为唯一电子受体，测定了厌氧培养过程中Fe（Ⅱ）浓度的变化，探讨了添加Cu2＋，Zn2＋，Pb2＋，Cd2＋，Hg2＋和As5＋对铁还原过程的影响及添加不同浓度Cu2＋和Hg2＋对Fe（Ⅱ）浓度的影响，并以土壤中添加不同浓度的Cu2＋试验作为对比。结果表明，不同重金属对异化铁还原影响不同，在同一浓度的几种重金属中，Cu2＋和Hg2＋对异化铁还原抑制最强；不同浓度Cu2＋和Hg2＋对异化铁还原有不同程度的抑制，主要表现在增加异化铁还原发生前的时间，减慢异化铁还原的速率，当Cu2＋和Hg2＋浓度增加到一定程度时异化铁还原几乎不发生；水稻土中含有大量铜时，铁还原也会被抑制；添加外源氧化铁可以减轻铜对水稻土铁还原的影响。 |
| 关键词: 水稻土 异化铁还原 重金属 |
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| 基金项目:国家自然科学基金项目（40271067）；教育部博士学科点专项科研基金项目（20020712009）；西北农林科技大学创新团队项目 |
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| Effects of different heavy metals on dissimilatory iron reduction |
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| Abstract: |
| In this study,paddy soil water extraction was incubated anaerobically as inoculum in a mixed culture containing ferrihydrite as sole electron acceptor,the concentrations of Fe(Ⅱ) were measured during incubation to assess effects of adding Cu2＋,Zn2＋,Pb2＋,Cd2＋,Hg2＋ and As5＋ on dissimilatory iron reduction and observe effects of adding different concentrations of Cu2＋ and Hg2＋ on the change of Fe(Ⅱ) concentrations.At the same time,different doses of Cu2＋ were added in paddy soil to compare.The results showed that different heavy metals affected dissimilatory iron reduction differently,at the same concentration,Cu2＋ and Hg2＋ restrained dissimilatory iron reduction most.With the increase of the concentrations of Cu2＋ and Hg2＋,the time before iron reduction increased and the rate of iron reduction decreased.When the contents of Cu2＋ and Hg2＋ reached certain level,there was little dissimilatory iron reduction.When there was a large content of copper in soil,iron reduction were restrained too.The restriction of Copper to iron reduction was weakened when the ferric oxide was added to the copper contamination soil. |
| Key words: paddy soil dissimilatory iron reduction heavy metal |
