Exact(3)
To quantify how much methane was transported internally through plants (the chimney effect), we blocked diffusion from the soil surface with an agar seal.
And despite the absence of any interaction between water table and overall CH4 emissions (Table 1), there were interesting differences between species in how the water-level treatment affected the proportion of CH4 transported internally.
Indeed, there have been many studies showing that more than half of CH4 emitted from wetland soils, including rice paddies, was transported internally by plants [ 13, 20, 33- 36]; and in a study of Alaskan tundra vegetation, 92 98% of CH4 was attributed to plant-mediated transport [ 29].
Similar(57)
Birds are known to transport seeds internally and externally, but scientists had not linked them to the long-distance dispersal of microscopic plant spores, called diaspores.
This argument is supported by our results, showing that species with a high capacity to transport CH4 internally caused relatively lower emissions.
Thus, the effect of a plant species upon overall CH4 fluxes cannot be gauged from its capacity to transport CH4 internally, alone.
They may enhance emissions, both by providing a carbon substrate for methanogenesis in the form of root exudates [ 10, 11], and by transporting CH4 internally from the rhizosphere to the atmosphere [ 12- 15]; and they may reduce emissions, by creating oxidising conditions in the rhizosphere [ 14, 16].
Lance Corporal Brandon Dieckmann says on their first day, his team took the robot through some thick brush, which an internally transported vehicle could not go through.
This presumably allowed internally transported oxygen to sustain root aerobic respiration and elongation under soil oxygen shortage (Cardoso et al. 2013).
It distilled from them "five rules of greener freight": demand cleaner equipment and practices, choose the most carbon-efficient mode of transport, collaborate internally and externally, redesign logistics networks, and get the most out of every move.
Most species (C. palustris, M. aquatica, R. hydrolapathum E. angustifolium, C. rostrata and A. odoratum) transported a higher proportion of CH4 internally (higher chimney effect) when the water level was high.
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