Hvad viser denne figur?

Wetlands making methane: Methane production - anaerobic process. Three ways for methane to escape soil to atmosphere: 1 - simple diffusion (fast if water is mixing) 2 - if water is deep enough to trap methane in a springlag 3 - it can build up as gas bubbles in the soil. If it comes up as bubbles then it will not be oxidised on the way up. The dominant path is through plants aerenchyma (luftrør i planten). Så hvis der er meget methan kommer det faktisk ind i rødderne, ind i aerenchyma og ud igennem planten.