As temperatures get warmer, scientists expect that there may be impacts on soil health.  To look at that, some Australian scientists tried to determine how warmer temperatures would affect soil carbon, a measure of oil health.  They looked at 12 different model simulations and found that while most of them predicted a decrease in soil carbon, a few showed an increase.  You can read the story by Ben Potter in AgWeb here.

Source: https://www.ars.usda.gov/is/graphics/photos/dec99/k8671-1.jpg