Influence of Common Reed (Phragmites australis) on CH₄ Production and Transport in Wetlands: Results from Single-Plant Laboratory Experiments

摘要

Laboratory culture experiments were conducted with common reed (Phragmites australis) to elucidate the role of root exudates on CH₄ production in wetland soils as well as the importance of different plant organs as routes of CH₄ to the atmosphere. In the 50 d experiment period, root exudates ranged from 0.03 to 1.53 µmolg−1d−1, which increased with reed growth. CH₄ production rate of soil was stimulated as root exudates collected was added. CH₄ transport capacity rate also increased with plant growth and influenced by light intensity. Root tips were the most important part of controlling diffusion of CH₄ into reed shoots, and leave transport accounted for 45.34% of total emissions into the atmosphere.