Methane emission from tropical savanna Trachypogon sp. grasses E. Sanhueza and L. Donoso IVIC, Atmospheric Chemistry Laboratory, Caracas, Venezuela
Abstract. Methane flux measurements from the soil-grass system were made during the
wet season in unperturbed plots and plots where standing dry and green
Trachypogon sp. grasses were clipped to just above the soil surface. Results support the
surprising discovery that vegetation emits methane. The results of this work
allows to infer that the savanna dry/green mixture of grasses produce
methane at a rate of ~10 ng m−2 s−1, which is in agreement
with early published soil-grass system fluxes. An extrapolation of this flux
to the global savanna produces an annual emission much lower than the
CH4 production recently suggested in the literature. On the other hand,
during the wet season savanna soil consume CH4 at a rate of
~4.7 ng m−2 s−1. Therefore, the tropical savanna soil-grass system
would make a modest contribution to the global budget of methane.
Citation: Sanhueza, E. and Donoso, L.: Methane emission from tropical savanna Trachypogon sp. grasses, Atmos. Chem. Phys., 6, 5315-5319, doi:10.5194/acp-6-5315-2006, 2006.