[MIS25-10] Contribution of vegetation to methane emission produced in the soil of an upland forest: a 13CH4-labelling approach
Keywords:methane, forest soil, vegetation
In order to quantify if vegetation is a preferential way of methane emission in our field site, a 13CH4 labelling had been undertaken. A pulse of 13CH4 was injected in the soil at a depth of 40 cm and 13CH4 was traced for two days after the pulse labelling in upper soil layers (0,5, 10, 25 cm depth), on the soil surface with soil chambers including or not herbaceous vegetation and in tree stem chambers.
Labelled CH4 was recovered in all compartments even if the forest was a net methane sink during this period. However, the vegetation (tree stems and understorey vegetation) have a limited contribution to the total recovery of labelled CH4 at the forest level, which is dominated by soil emission. Our results also confirm that a large part of the methane that diffuse from the deep soil layers is consumed before reaching the soil surface.