Certainly! Here is a concise summary of the provided article section:

CH4 and O2 Source Terms

The key points are:

CH4 Net Source Term:
- Includes production, oxidation at the base of aerenchyma, transport through aerenchyma, methanotrophic oxidation, and ebullition (to the control volume above the water table if unsaturated or directly to the atmosphere if saturated).

O2 Net Source Term Below the Top Control Volume:
- Consists of O2 losses from methanotrophy, SOM decomposition, and autotrophic respiration.
- Has an O2 source through aerenchyma.

The summary captures the main components that contribute to the CH4 and O2 source terms in the described system.