Physiological processes affecting methane transport by wetland vegetation – A review

Wetland plants transport oxygen to belowground tissues survive in anoxic sediments, and simultaneously conduct methane (CH4) from the sediment atmosphere. Although plant-mediated is main CH4 emission pathway vegetated wetlands, contribution of areas total emissions wetlands remains uncertain. To accurately quantify these emissions, understanding physiological processes driving crucial. This review describes state art through trees, emergent, floating-leaved, submerged freshwater macrophytes. Gas mechanisms include diffusion, pressurized flow, transpiration-driven flow. Pressurized flow gas-filled aerenchyma leads higher gas rates than mostly occurs standing deeper water. Transpiration-driven xylem tissue whereby dissolved transported by sap both result diel cycles emission, with during day at night. The a wetland plant depends on its growth stage, balance between in-plant production oxidation. contribute substantially soil carbon content, temperature, nutrient availability, water depth are often stronger factors species. Nevertheless, accurate quantification requires standardization measurement protocols which capture diurnal seasonal variation emissions. Knowledge trees submersed free-floating macrophytes scarce warrants further research.