Phosphorus limitation ofCymodocea nodosa growth |
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Authors: | M Perez J Romero C M Duarte K Sand-Jensen |
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Institution: | (1) Departemento de Ecologia, Universidad de Barcelona, Avg. Diagonal 645, E-08028 Barcelona, Spain;(2) Centro de Estudios Avanzados de Blanes, C.S.I.C., Camino de Santa Barbara, E-17300 Blanes, Gerona, Spain;(3) Freshwater Laboratory, University of Copenhagen, Helsingørsgade 51, DK-3400 Hillerød, Denmark |
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Abstract: | Experimental nutrient (N, P, and N+P) additions to shallow (ca. 1 m)Cymodocea nodosa (Ucria) Aschers. stands growing in patches and in a continuous meadow in a Mediterranean Bay (Alfacs Bay, NE Spain) in 1988 demonstrated mid-summer growth to be strongly P-limited, as suggested by the high N:P ratios (>35) in unmanipulated plants. P additions resulted in increased leaf P content, reduced N:P ratios, and enhanced shoot growth and turnover in both populations. These effects promoted in turn a stand response, leading to increased biomass and, therefore, increased areal productivity in the plots receiving P. The stand response was largely attributable to a doubling of shoot density, indicating enhanced rhizome growth and branching. |
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