Soil Organic Matter MCQs Quiz 3

1. Soil respiration primarily measures _______

2. In soil organic matter (SOM) models (e.g., the three-pool model), the intermediate pool with a turnover time of several years to decades is most commonly referred to as _______

3. In soil science, biochar is best classified as _______

4. The C:N ratio of stable SOM is approximately _______

5. Immobilization in soil nutrient cycling is _______

6. In standard soil organic matter (SOM) models (e.g., the three-pool model), the most stable pool with the slowest turnover rate is referred to as the _______

7. Soil organic matter (SOM) enhances soil water retention by _______

8. In soil microbiology, carbon use efficiency (CUE) refers to the fraction of assimilated carbon that is ______

9. Recalcitrant carbon in soils is characterized as _______

10. Microbial biomass contributes to soil organic matter (SOM) primarily by _______