PJB-2024-288
Soil organic matter content significantly regulates bacterial carbon metabolism capacity in mining areas
Peng Gao
Abstract
Microorganisms are pivotal in soil organic matter (SOM) and nutrient cycling, essential for the conversion and stabilization of organic carbon within the soil carbon pool. Despite extensive research on the relationship between soil organic matter and bacterial communities, the impact of SOM on bacterial carbon metabolism in mining areas remains largely unexplored. In this study, we conducted a pot experiment to investigate how varying SOM contents (ranging from 1.1% to 3.5%) affect the carbon metabolism of soil bacterial communities in mining areas. Our results indicate a significant influence of SOM on bacterial diversity and abundance (p<0.05), with the highest diversity observed at 2.5% SOM. Furthermore, we observed a positive correlation between SOM content and the metabolic activity of bacterial communities, suggesting that elevated SOM levels promote a more active and diverse microbial metabolism. Additionally, using the BugBase tool for functional prediction, we found that the relative abundance of biofilm-forming bacteria increased with higher SOM content. Overall, our findings highlight the direct impact of SOM on bacterial diversity and indirectly on carbon metabolism by modifying the proportion of biofilm-forming bacteria. These insights underscore the importance of regular monitoring and implementing integrated agricultural management practices to enhance organic matter inputs and improve soil fertility in mining areas.
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