Conversion from double-rice to maize-rice increases iron-bound organic carbon by iron gate and enzyme latch mechanisms

To assess the impact of the incorporation of maize into double-rice (RR) on soil organic carbon (SOC) sequestration, a two-year experiment was conducted and changes in iron-bound SOC (Fe-SOC), as a proxy for stable carbon pool, were measured. The introduction of a maize-rice (MR) rotation enhanced Fe-SOC by 12-17 % in the maize season, and it stayed 13-36 % higher during rice cultivation compared to RR. Following the iron gate theory, Fe oxidation in the maize season was the leading mechanism for improving Fe-SOC content. However, enzyme latch, i.e. the suppression of Fe-SOC loss by decreased phenol oxidase activity, was a dominant factor controlling the increase of Fe-SOC in the rice season of MR. Thus, the introduction of maize into the paddy field increased Fe-SOC, which was caused by combination of iron gate mechanism in maize season and enzyme latch in rice season.

Automated summary

Introducing maize into paddy fields can increase Fe-SOC content, with Fe oxidation mechanism being the main driver in the maize season and enzyme latch mechanism controlling the increase of Fe-SOC in the rice season.