Plant Biol (Stuttg) 2005; 7(2): 182-189
DOI: 10.1055/s-2005-837469
Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Environmental Constraints on Phenology and Internal Nutrient Cycling in the Mediterranean Winter-Deciduous Shrub Amelanchier ovalis Medicus

R. Milla1 , P. Castro-Díez2 , M. Maestro-Martínez1 , G. Montserrat-Martí1
  • 1Instituto Pirenaico de Ecología (C.S.I.C.), P.O. Box 202, 50080 Zaragoza, Spain
  • 2Departamento de Ecología, Facultad de Ciencias, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
Weitere Informationen

Publikationsverlauf

Received: June 8, 2004

Accepted: December 6, 2004

Publikationsdatum:
09. Februar 2005 (online)

Abstract

The functional adjustments of winter-deciduous perennials to Mediterranean conditions have received little attention. The objectives of this study were: (i) to determine whether Amelanchier ovalis, a winter-deciduous shrub of Mediterranean and sub-Mediterranean regions, has nutritional and phenological traits in common with temperate zone deciduous trees and shrubs and (ii) to determine the constraints of Mediterranean environmental conditions on these traits. Over two years, phenology and nitrogen, and phosphorus concentrations were monitored monthly in the crown of A. ovalis. Leaf longevity, survival and nutrient resorption from senescing leaves were used to infer nutrient use efficiency and retention times of nutrients within the crown. In A. ovalis, bud burst was much earlier than in temperate deciduous trees and shrubs. Most vegetative and reproductive growth occurred in spring. Limited phenological development took place during the summer drought period. Unexpectedly, leaf shedding was very gradual, which might be related to water shortages in summer. Leaf longevity, nutrient resorption from senescing leaves, and maximum leaf nutrient concentrations indicated that nutrient retention times were short and nutrient use efficiency was low compared to that found in temperate deciduous plants and co-occurring Mediterranean evergreens. A. ovalis exhibited phenological development appropriate for a Mediterranean climate, although its limited ability to retain nutrients likely restricts the types of sites that it can occupy.

References

R. Milla

Instituto Pirenaico de Ecología (C.S.I.C.)

P.O. Box 202

50080 Zaragoza

Spain

eMail: rmilla@ipe.csic.es

Editor: M. C. Ball

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