Nitrogen dynamics in Posidonia oceanica cuttings: implications for transplantation experiments
2004
Lepoint, Gilles | Vangeluwe, Denis | Eisinger, Michael | Paster, Marcus | van Treeck, Peter | Bouquegneau, Jean-Marie | Gobert, Sylvie
Centre Interfacultaire de Recherches en Océanologie - MARE
Mostrar más [+] Menos [-]A N-15 tracer study was performed during an experimental transplantation trial of natural Posidonia oceanica cuttings. The experiment was done in situ at 17 m depth in the Revellata Bay (Calvi, NW Corsica, France). Despite high survival rates of transplants (>90%) after one year, the weight and the N content of transplants are significantly lower than those of reference plants. In absence of roots, the transplants are not able to meet their N requirement because, leaf uptake is insufficient to replenish the N lost during the natural leaf decay. This could constitute a major cause of long-term failure for transplantation experiments or natural recolonisation processes. The increase of the N-15 content in the roots shows that the plant re-allocates the nitrogen of one organ (i.e. leaves, rhizomes) to ensure the growth of another (i.e. roots). (C) 2003 Elsevier Ltd. All rights reserved.
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