What is one reason for the higher rate of respiration found in soil under trees?

Soil under trees typically has a higher rate of respiration primarily because tree roots contribute significantly to respiration. Tree roots not only engage in respiration themselves, breaking down sugars to produce energy, but they also support a diverse ecosystem of microorganisms and fungi that thrive in the nutrient-rich soil. These organisms also contribute to the overall respiration rate within that environment, as they decompose organic matter, enhancing soil aeration and nutrient cycling.

Factors like increased heat from sunlight and available water can also influence respiration rates, but they are not as directly related to the biological processes occurring in the soil as the respiration associated with tree roots and their supporting organisms.