Abstract
In wetland plants, internal transfer of gases is vital for growth on permanently water-saturated or waterlogged soils, being required to supply oxygen to the rhizomes and roots. Over the past decade, various physical mechanisms have been proposed to be responsible for pressurized ventilation in plants which are adapted to wetland and freshwater habitats. It has now become clear that transfer effects that can be described by Graham's law of diffusion are involved in this process, in addition to thermal transpiration, humidity-induced and venturi-induced gas transport in swamp grasses. Gas flow in accordance with Graham's law has also been reported for roots of Alnus (alder) trees. We suggest that this effect may contribute significantly to oxygen supply to the rhizosphere and to the remineralization of organic compounds in soil, thus improving plant nutrition.
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References
Armstrong, J. & W. Armstrong, 1990. Pathway and mechanisms of oxygen transport in Phragmites australis. In Cooper, P. F. & B. C. Findlater (eds), The Use of Constructed Wetlands in Water Pollution Control. Pergamon, Oxford: 529–533.
Armstrong, J., W. Armstrong, P. M. Beckett, J. E. Halder, S. Lythe, R. Holt & A. Sinclair, 1996. Pathways of aeration and the mechanism and beneficial effects of humidity-and Venturiinduced convections in Phragmites australis (Cav.) Trin. Ex Steud. Aquat. Bot. 54: 121–135.
Frick, H. J., D. Woermann & W. Grosse, 1997. How tree roots gather oxygen from soil for energy supply by respiration. Z. Naturforsch. 52c: 824–827.
Grosse, W., 1996. The mechanism of thermal transpiration (= thermal osmosis). Aquat. Bot. 54: 101–110.
Grosse, W., J. Armstrong & W. Armstrong, 1996. A history of pressurized gas-flow studies in plants. Aquat. Bot. 54: 87–100.
Schiwinski, K., W. Grosse & D. Woermann, 1996. Convective gas flow in plant aeration and Graham's law of diffusion. Z. Naturforsch. 51c: 681–690.
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Grosse, W., Frick, HJ. Gas transfer in wetland plants controlled by Graham's law of diffusion . Hydrobiologia 415, 55–58 (1999). https://doi.org/10.1023/A:1003885701458
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DOI: https://doi.org/10.1023/A:1003885701458