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Wetland trees are a significant overlooked source of the potent greenhouse gas methane, according to a new study. Wetlands are a well-established and prolific source of atmospheric methane. Yet despite an abundance of seething swamps and flooded forests in the tropics, ground-based measurements of methane have fallen well short of the quantities detected in tropical air by satellites. Methane emissions normally are measured by putting sealed chambers on the ground to capture gas seeping or bubbling from the soil. We also enclosed tree stems in chambers and the results were surprising. About 80 per cent of all methane emissions was venting through the trees. The roots of trees, like all plants, need oxygen to survive. One strategy that trees use to cope in waterlogged soil is to enlarge porous structures, known as lenticels, in their stems to allow air to enter and diffuse to their roots.
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