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| Web URL(s): | http://www.jstor.org/stable/2557658
Last checked: 12/18/2015
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| Publication Type:
| Refereed |
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| Author(s): | Armstrong, Jean;
Armstrong, William;
Beckett, Peter M. |
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| Author Affiliation: | Department of Applied Biology and Department of Applied Mathematics, University of Hull, HU6 7RX |
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| Title: | Phragmites australis: Venturi- and humidity-induced pressure flows enhance rhizome aeration and rhizosphere oxidation |
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| Source: | New Phytologist. Vol. 120, No. 2, February 1992, p. 197-207. |
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| Publishing Information: | Oxford, England: Cambridge University Press. |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Aeration; Phragmites; Light; Wind; Rhizosphere; Oxidation; Roots
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| Abstract/Contents: | "A Venturi-induced convection of gases through the Phragmites rhizome system is reported and the effects of this, and a humidity-induced convection previously described, are quantified. The Venturi-convection is driven by a pressure differential created by wind blowing across tall dead culms which sucks air into the underground system via culms snapped off closed to ground level. The results demonstrate how wind, by increasing Venturi-induced convection, and how radiant energy, by increasing humidity-induced convection, raise the oxygen concentrations in the rhizome system, thereby causing much greater fluxes of oxygen into root and rhizosphere than are achieved if rhizome aeration is by diffusion alone. In laboratory experiments convective flow rates of as low as 0.7-1.4x10-8 m3s-1(approx. 20-40 mm min-1 in the rhizome) were sufficient to raise rhizome oxygen concentration to 90% of atmospheric. The significance of this is discussed in connexion[connection] with pollution control by constructed wetlands, and photographic evidence is provided of the rhizosphere oxidizing activities in soil and anaerobic solution. A mathematical model is derived to help to evaluate the contributions of convection and diffusion in rhizome aeration, and to assess the likely effects of root and rhizosphere oxygen demands." |
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| Language: | English |
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| References: | 41 |
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| Note: | Pictures, color
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Armstrong, J., W. Armstrong, and P. M. Beckett. 1992. Phragmites australis: Venturi- and humidity-induced pressure flows enhance rhizome aeration and rhizosphere oxidation. New Phytol. 120(2):p. 197-207. |
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| Web URL(s):
http://www.jstor.org/stable/2557658
Last checked: 12/18/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: QK 1 .N38 |
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