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- Weisner, Stefan E.B. 1954-
(författare)
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Factors affecting the internal oxygen supply of Phragmites australis (Cav.) Trin. ex Steudel in situ
- 1988
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Ingår i: Aquatic Botany. - Amsterdam : Elsevier. - 0304-3770 .- 1879-1522. ; 31:3-4, s. 329-335
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Tidskriftsartikel (refereegranskat)abstract
- Oxygen concentration in basal stems of Phragmites australis (Cav.) Trin. ex Steudel was measured in situ, in monospecific stands. The mean O2 concentration in basal stems, and mean shoot length above water, decreased in deeper water. Oxygen concentration in basal stems was correlated to shoot length above water at a given water depth, and the mean O2 concentration in basal stems of shoots with similar length above water decreased in deeper water. The results suggest that O2 transport from shoots to below-ground parts is restricted in deep water by: (1) small shoot length above water; (2) long O2 transport distance. No influence of substrate redox potential on O2concentration in basal stems was found. © Copyright 1988 Elsevier B.V.
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| 2. |
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| 3. |
- Weisner, Stefan, 1954-
(författare)
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The relation between wave exposure and distribution of emergent vegetation in a eutrophic lake
- 1987
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Ingår i: Freshwater Biology. - Chichester, United Kingdom : Wiley-Blackwell. - 0046-5070 .- 1365-2427. ; 18:3, s. 537-544
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Tidskriftsartikel (refereegranskat)abstract
- Maximum water depth penetration and changes in horizontal distribution during 39yr of the emergent vegetation in Lake Krankesjon, S Sweden, were investigated. The capacity of the emergent vegetation to penetrate into deeper water areas was higher at wave exposed than at sheltered sites. Differences in biomass and biomass allocation of the dominant species, Phragmites australis, between an exposed and a sheltered site suggest that horizontal expansion towards deeper water at sheltered sites is limited by unfavourable substrate conditions.
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