Carbon Speciation by Microbes in Soil: Indicators of Carbon Sequestration and Soil Function

Soil represents Earth’s largest carbon reservoir, and comprehending the distribution of carbon within it is vital for maintaining this carbon store. Understanding the factors influencing carbon distribution is crucial for forecasting global carbon dynamics and their ecological impacts. Soil microbes actively engage in nearly all biochemical processes within soil. Carbon distribution and transformation occur through various soil components, with microbes playing a pivotal role in these processes. When carbon is readily accessible to microorganisms and their extracellular enzymes, it undergoes rapid oxidation. These microbial activities serve as indicators of carbon sequestration and soil functionality, which ultimately contribute to sustaining soil with high carbon reserves. To gain a comprehensive understanding of carbon sequestration potential, proper carbon mapping and speciation analyses are necessary. Furthermore, investigations into influencing factors such as soil microbes, microaggregates, and land use management are imperative. Anthropogenic activities have been observed to modify carbon distribution by altering storage capacity and impacting the composition and dynamics of soil organic carbon, thus influencing soil organic matter. Soil acts as a significant reservoir of carbon primarily in the form of soil organic carbon (SOC) and holds the potential to store more carbon than the atmosphere. Carbon from primary producers in ecosystems, utilized during plant photosynthesis, is transferred to the soil as soil organic matter (SOM). Microbial communities are instrumental in interconverting different carbon forms. Enhanced understanding of these mechanisms can facilitate improved carbon sequestration in soil, given their indicative role in the process.