| 王丽超,江世杰,黎先发.放射性污染条件下土壤微生物活性及群落功能多样性特征[J].广东农业科学,2019,(8-9):- |
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放射性污染条件下土壤微生物活性及群落功能多样性特征 |
| Characteristics of soil microbial activity and community functional diversity under radioactive contamination |
| 投稿时间：2019-05-29 修订日期：2019-06-12 |
| DOI： |
| 中文关键词: 铀尾矿 放射性污染 土壤微生物活性 微生物群落多样性 |
| 英文关键词: uranium tailings radioactive contamination activities of soil microbial diversity of microbial communities |
| 基金项目:西南科技大学龙山学术人才科研支持计划“含磷化合物-植物联合修复技术在核污染土壤修复中的应用研究”（17LZXY10）；四川省科技厅农业领域研发项目“就地化秸秆炭化制备生物炭并用于重金属污染土壤治理的集成应用研究”(2018SZ0301);西南科技大学博士基金“耐辐射异常球菌drwH基因的胁迫响应与调控机制研究”（18zx7127）。 |
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| 中文摘要: |
| 【目的】为揭示放射性污染与土壤微生物活性及群落功能多样性的内在联系，同时为放射性污染土壤生物治理与安全评价提供一定参考，【方法】以我国南方某典型铀尾矿库中采集的土壤为研究对象，使用微生物活性测定方法和Biolog-Eco技术对土壤样品中微生物量氮（MBN）、微生物熵（qMB）、基础呼吸（BRC）和代谢熵（qCO2）等微生物活性指标及微生物群落功能多样性进行分析。【结果】结果表明，不同污染程度土壤微生物活性呈现显著差异，除qMB外，各取样点的MBN、BRC、qCO2都低于对照水平；相关性分析显示U、226Ra与各指标均呈负相关，但未达到显著；放射性污染整体上显著降低了土壤微生物群落对碳源的利用能力，主成分分析(PCA) 表明这种差异主要体现在碳水化合物上，其次是氨基酸；不同程度的放射性污染土壤中，微生物群落功能多样性也存在显著差异，污染程度较低的土壤中，微生物多样性整体表现较高。【结论】结果显示，放射性污染土壤中微生物的活性、群落代谢特征都发生了显著的改变，因此可以将他们为环境监测的敏感指标。 |
| 英文摘要: |
| Abstract: 【Objective】This study aims to reveal the intrinsic relationship between radioactive pollution and soil microbial activity and community functional diversity, it also provides a reference for bio-polluting and safety evaluation of radioactive contaminated soil.【Method】Soil sample was taken from the surrounding of a uranium tailings repository in South China, the activities and functional diversity of soil microbial communities was investigated by conventional microbial activity evaluation method and Biolog-Eco technology.【Result】The results showed that soil microbial activity is significantly correlated with pollution concentration,except for qMB, MBN, BRC and qCO2 of each sampling point were lower than the control level.Correlation analysis showed that U and 226Ra were negatively correlated with each index, but did not reach significant.Radioactive contamination as a whole significantly reduces the ability of soil microbial communities to utilize carbon sources. Principal component analysis (PCA) indicates that this difference is mainly reflected in carbohydrates, followed by amino acids.There are also significant differences in the functional diversity of microbial communities in different levels of radioactive contaminated soil. In soils with lower pollution levels, the overall microbial diversity is higher.【Conclusion】Compared with the control, the microbial activity and community metabolism characteristics of radioactive contaminated soils changed significantly, so they can be used as sensitive indicators for environmental monitoring. |
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