Nitrogen dynamics in Posidonia oceanica cuttings:: implications for transplantation experiments

MARINE POLLUTION BULLETIN

卷:48

Article

Lepoint, G ; Vangeluwe, D ; Eisinger, M ; Paster, M ; van Treeck, P ; Bouquegneau, JM ; Gobert, S

关键词: Posidonia;    seagrass;    transplantation;    nitrogen budget;    N-15 tracer;    NW Mediterranean;   

DOI  :  10.1016/j.marpolbul.2003.08.023

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free