title: Growth in epiphytic bromeliads: response to the relative supply of phosphorus and nitrogen.
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.
authors.affiliation: Universität Oldenburg, Institut für Biologie und Umweltwissenschaften, AG Funktionelle Okologie, Oldenburg, Germany. gerhard.zotz@uni-oldenburg.de
authors.forename: G
authors.initials: G
authors.lastname: Zotz
authors.forename: R
authors.initials: R
authors.lastname: Asshoff
mesh_terms: D031229:Bromeliaceae / Q000254:growth & development*; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*
chemical_list: D010758:Phosphorus; D009584:Nitrogen