Soil CO2 efflux, also known as soil respiration, is the process by which carbon dioxide is released from soil to the atmosphere. This release of CO2 occurs through the respiration of soil microorganisms, plant roots, and other soil organisms as they break down organic matter and release carbon dioxide as a byproduct. Soil CO2 efflux is an important component of the carbon cycle and plays a crucial role in the exchange of carbon between the soil and the atmosphere. Studying soil CO2 efflux can help scientists better understand the dynamics of carbon cycling in terrestrial ecosystems and how it is influenced by factors such as temperature, moisture, vegetation, and land management practices.