Soils are a large reservoir of carbon (C) on land, and there is uncertainty regarding how this reservoir will be affected by climate change. Currently, active research on (1) how changing precipitation patterns, a key aspect of climate change, will affect soil C and (2) how vulnerable subsoils are to climate change is still being undertaken. In this study, we examined subsoils after 20 years of experimentally manipulated precipitation shifts to see whether increasing precipitation would affect C amounts and chemistry.