The study looked at how roots grow and die in two types of trees in different seasons and soil depths. They used special tubes to watch the roots and found that one type of tree had slower growth and death rates than the other. The trees had different patterns of root growth and death in different seasons and soil depths. Factors like air temperature, precipitation, soil temperature, and soil nutrients affected how the roots grew and died. Overall, the study showed that these factors control how roots grow, die, and get replaced in the trees.