What does "microbial biomass" in soil consist of?

Microbial biomass in soil refers specifically to the total mass of microorganisms present in that environment. This includes a diverse range of organisms such as bacteria, fungi, archaea, and protozoa, which play critical roles in nutrient cycling, soil structure, and overall soil health. Microbial biomass is indicative of the biological activity and health of the soil ecosystem, contributing to functions like organic matter decomposition, nutrient availability, and even disease suppression.

Understanding microbial biomass is essential for managing soil fertility and ensuring sustainable agricultural practices. It reflects the living component of soil organic matter and highlights the importance of microbial life in both natural and agricultural systems. The measurement of microbial biomass can provide insights into soil quality and fertility levels, guiding appropriate management practices to enhance soil health.

Considering the other choices, they either refer to non-biological components of the soil or specific materials that do not encapsulate the living aspect of the soil's microbial community. Thus, focusing on the total mass of microorganisms accurately defines what microbial biomass entails.