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Influence of pressurized ventilation on performance of an emergent macrophyte (Phragmites australis)

Vretare, V and Weisner, Stefan LU (2000) In Journal of Ecology 88(6). p.978-987
Abstract
1 Pressurized ventilation, which increases gas exchange between aerial and submerged plant parts, has been found in various emergent macrophyte species. We investigated the potential for this mechanism to affect growth, morphology and biomass allocation in Phragmites australis in glasshouse experiments. 2 Inhibition of pressurized ventilation by perforation of stems above the water surface resulted in decreased oxygen concentrations in stem bases and rhizomes. Perforation caused little mechanical damage. 3 Allometric methods were used to evaluate treatment effects on biomass allocation and morphology. 4 Inhibition of pressurized ventilation resulted in decreased allocation to belowground weight and decreased rhizome penetration into the... (More)
1 Pressurized ventilation, which increases gas exchange between aerial and submerged plant parts, has been found in various emergent macrophyte species. We investigated the potential for this mechanism to affect growth, morphology and biomass allocation in Phragmites australis in glasshouse experiments. 2 Inhibition of pressurized ventilation by perforation of stems above the water surface resulted in decreased oxygen concentrations in stem bases and rhizomes. Perforation caused little mechanical damage. 3 Allometric methods were used to evaluate treatment effects on biomass allocation and morphology. 4 Inhibition of pressurized ventilation resulted in decreased allocation to belowground weight and decreased rhizome penetration into the substrate in two of three experiments. Treatment also decreased growth rate, rhizome length and number of rhizomes when substrate had a high organic content. In the third experiment, growth clearly decreased in deep water, although inhibition of pressurized ventilation did not affect growth, biomass allocation or morphology at either of the water depths tested. 5 Decreased allocation to below-ground parts and decreased rhizome lengths may be adaptations to allow the oxygen concentration in roots and rhizomes to be maintained above a critical level when the oxygen supply is low. 6 Pressurized ventilation may improve the performance of P. australis but only under certain conditions (e.g. not when growth rate is low or the substrate has a high redox potential). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Ecology
volume
88
issue
6
pages
978 - 987
publisher
Wiley-Blackwell
external identifiers
  • scopus:0034493855
ISSN
1365-2745
DOI
10.1046/j.1365-2745.2000.00505.x
language
English
LU publication?
yes
id
18d2341d-c332-4ae0-b9d9-87b01fd47d7f (old id 146688)
date added to LUP
2007-06-29 08:26:00
date last changed
2017-01-01 04:45:58
@article{18d2341d-c332-4ae0-b9d9-87b01fd47d7f,
  abstract     = {1 Pressurized ventilation, which increases gas exchange between aerial and submerged plant parts, has been found in various emergent macrophyte species. We investigated the potential for this mechanism to affect growth, morphology and biomass allocation in Phragmites australis in glasshouse experiments. 2 Inhibition of pressurized ventilation by perforation of stems above the water surface resulted in decreased oxygen concentrations in stem bases and rhizomes. Perforation caused little mechanical damage. 3 Allometric methods were used to evaluate treatment effects on biomass allocation and morphology. 4 Inhibition of pressurized ventilation resulted in decreased allocation to belowground weight and decreased rhizome penetration into the substrate in two of three experiments. Treatment also decreased growth rate, rhizome length and number of rhizomes when substrate had a high organic content. In the third experiment, growth clearly decreased in deep water, although inhibition of pressurized ventilation did not affect growth, biomass allocation or morphology at either of the water depths tested. 5 Decreased allocation to below-ground parts and decreased rhizome lengths may be adaptations to allow the oxygen concentration in roots and rhizomes to be maintained above a critical level when the oxygen supply is low. 6 Pressurized ventilation may improve the performance of P. australis but only under certain conditions (e.g. not when growth rate is low or the substrate has a high redox potential).},
  author       = {Vretare, V and Weisner, Stefan},
  issn         = {1365-2745},
  language     = {eng},
  number       = {6},
  pages        = {978--987},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Ecology},
  title        = {Influence of pressurized ventilation on performance of an emergent macrophyte (Phragmites australis)},
  url          = {http://dx.doi.org/10.1046/j.1365-2745.2000.00505.x},
  volume       = {88},
  year         = {2000},
}