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Fitosociologia numero 44 (1)

pag. 11-16: Ecologia della duna: ritmo fenologico delle specie psammofile

L. Gratani, M.F. Crescente & L. Varone

Dipartimento di Biologia Vegetale, Università “La Sapienza”, P.le A. Moro 5, I-00185 Roma: e-mail: loretta.gratani@uniroma1.it

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abstract

Phenological trend of psammophilous species. The phenological behaviour of the most representative species of the psammophilous vegetation was analysed in two traits of the latial coast: the dune system inside the Presidential Estate of Castelporziano (S-SW of Rome) and inside the Circeo National Park (S-SE of Rome). Phenological observations were carried out on Cakile maritima Scop., Agropyron junceum (L.) Beauv., Sporobolus pungens (Schreber) Kunth, Cyperus kalli (Forsskål) Murb., Ammophila littoralis (Beauv.) Rothm., Ononis variegata L., Pancratium maritimum L., Eryngium maritimum L., Calystegia soldanella (L.) R.Br., Crucianella maritima L. and Anthemis maritima L. The influence of air temperature and rainfall on phenology was analysed; air temperature influenced in particular the beginning of the vegetative activity and the relative growth rate (RGR). The growth of the species happened in late winter, flowering in spring followed by fruiting. A new vegetative activity was monitored in autumn. The phenological trend of the psammophilous vegetation seemed to be an adaptative strategy to the climatic stresses of this environment.
The forecast increase of air temperature and the conversion of natural landscapes, including coastal zones, might  produce a global change in the structure and functioning of the ecosystems, including species extinctions, in particular of those most sensitive to changing environmental factors.

keywords

air temperature, climate, phenology, psammophilous vegetation