Emergence and submergence effects on the distributional pattern and exchange of phosphorus in the seagrass Zostera noltii Hornem
Pérez-Llorens, J.L.; Niell, F.X. (1989). Emergence and submergence effects on the distributional pattern and exchange of phosphorus in the seagrass Zostera noltii Hornem, in: Ros, J.D. (Ed.) Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3): pp. 497-503
In: Ros, J.D. (Ed.) (1989). Topics in Marine Biology: Proceedings of the 22nd European Marine Biology Symposium, Barcelona, Spain, August 1987. Scientia Marina (Barcelona), 53(2-3). Instituto de Ciencias del Mar: Barcelona. 145-754 pp., more
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, more
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Document type: Conference paper
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| Authors | | Top |
- Pérez-Llorens, J.L.
- Niell, F.X.
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| Abstract |
The distribution pattern of soluble and particulate phosphorus within the seagrass Zostera noltii and, at the same time, the exchange of soluble reactive phosphorus (SRP) between leaves and the environment during short time periods, are studied. Two types of field experiments have heen carried out: one, on plants under emersion stress, and the other on submerged plants. In submerged plants, SNRP and SRP concentrations are higher than in emersed ones. Concentrations of PP are higher in emersed plants. Maximum SRP concentration is generally found in the basal part of the leaf, reaching 94.8 ± 6.4 µmol P g dry wt, in emersed and about 105.8 ± 5.4 µmol P g-1 dry wt, in submerged plants. Depending on incubation time and the emersed-suhmerged conditions, maximum SNRP concentrations are generally found in the leaf tip and in the belowground parts (root-rhizomes) in the submerged plants, and in the stem and in the root-rhizomes in the emersed ones, reaching up to 190.0 ± 26,5 µmol P g-1 dry wt in submergence and 123.3 ± 7.6 µmol P g-1 dry wt in emergence. Maximum PP concentrations are found in the rhizome, reaching up to 334.0 ± 25.0 µmol P g-1 dry wt, in emersed and up to 237.0 ± 15.0 µmol P g-1dry wt in submerged plants. The phosphorus exchange dynamics between leaves and the environment was also different in both experiments. Net balance becomes a leaf uptake (0.23 µmol P g-1 dry wt h-1) in emergence and a leaf release in submergence (0.05 µmol P g-1 dry wt -1). |
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