| 【Objective】This study aims to reveal the intrinsic relationship between radioactive pollution and soil
microbial activity and community functional diversity, and it also provides a certain reference for bio-control and safety
evaluation of radioactive contaminated soil.【Method】Soil samples were taken from the surrounding of a uranium tailings
repository in South China, and the micobial activity indicators such as MBN, BRC and qCO2 in soil samples and functional
diversity of microbial communities were analyzed by microbial activity determination method and Biolog-Eco technology.
【Result】The results showed that soil microbial activity was significantly correlated with pollution concentration, except
for qMB, the activities of MBN, BRC and qCO2 of each sampling point were lower than those of the control level. Correlation
analysis showed that U and 226Ra were negatively correlated with each index, but were not significant. Radioactive
contamination significantly reduced the ability of soil microbial communities to utilize carbon sources as a whole. Principal
component analysis (PCA) indicated that such differences were mainly reflected in carbohydrates, followed by amino acids.
There were also significant differences in the functional diversity of microbial communities in radioactive contaminated soils
of different levels. In soils with lower pollution, the overall microbial diversity was higher.【Conclusion】Compared with the
control, the microbial activities and community metabolism characteristics of radioactive contaminated soils have changed significantly, therefore, they can be used as sensitive indicators for environmental monitoring. |
