Long-term warming offsets the beneficial effect of elevated CO on mineral associated organic carbon in Mollisols.

The stability of soil organic carbon (SOC) is fundamentally important to the carbon-climate feedback because soils act as a major carbon source or sink under climate change. The uncertainty of SOC stability in farming soils in response to climate change necessitates mechanistic studies on microbial attributes to the change of SOC. Here, we used open-top chambers to simulate elevated CO (eCO) and warming for 12 years in a soybean-grown Mollisol.