Growth in epiphytic bromeliads: response to the relative supply of phosphorus and nitrogen

Authors

  • G. Zotz,

    1.  Universität Oldenburg, Institut für Biologie und Umweltwissenschaften, AG Funktionelle Ökologie, Oldenburg, Germany
    2.  Smithsonian Tropical Research Institute, Balboa, Ancon, República de Panamá
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  • R. Asshoff

    1.  Botanisches Institut der Universität Basel, Basel, Switzerland
    2.  Present address: Zentrum für Didaktik der Biologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
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  • Editor
    M. Hawkesford

G. Zotz, Universität Oldenburg, Institut für Biologie und Umweltwissenschaften, AG Funktionelle Ökologie, Postfach 2503, D-26111 Oldenburg, Germany.
E-mail: gerhard.zotz@uni-oldenburg.de

Abstract

Insufficient nitrogen (N) and phosphorus (P) frequently limit primary production. Although most nutrient studies on vascular epiphytes have focused on N uptake, circumstantial evidence suggests that P rather than N is the most limiting element for growth in this plant group. We directly tested this by subjecting a total of 162 small individuals of three bromeliad species (Guzmania monostachia, Tillandsia elongata, Werauhia sanguinolenta) to three N and three P levels using a full-factorial experimental design, and determined relative growth rates (RGR) and nutrient acquisition over a period of 11 weeks. Both N and P supply had a significant effect on RGR, but only tissue P concentrations were correlated with growth. Uptake rates of N and P, in contrast, were not correlated with RGR. Increased nutrient supply led to an up to sevenfold increase in tissue P concentration compared to natural conditions, while concentrations of N hardly changed or even decreased. All treatment combinations, even at the lowest experimental P supply, led to decreased N:P ratios. We conclude that P is at least as limiting as N for vegetative function under natural conditions in these epiphytic bromeliads. This conclusion is in line with the general notion of the prevalence of P limitation for the functioning of terrestrial vegetation in the tropics.

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