Foliar N and P resorption and nutrient levels along an elevational gradient in Juniperus oxycedrus L. subsp. macrocarpa (Sibth. & Sm.) Ball

Free access article

Issue		Ann. For. Sci. Volume 60, Number 5, July-August 2003


Page(s)		449 - 454
DOI		10.1051/forest:2003037

Ann. For. Sci. 60 (2003) 449-454
DOI: 10.1051/forest:2003037

Foliar N and P resorption and nutrient levels along an elevational gradient in Juniperus oxycedrus L. subsp. macrocarpa (Sibth. & Sm.) Ball

Hamdi Güray Kutbay^a and Tolga Ok^b

^a University of Ondokuz Mayis, Faculty of Science and Arts, Department of Biology, 55139, Kurupelit-Samsun, Turkey
^b University of Sütçü mam, Faculty of Forestry, 46060, Kahramanmaraç, Turkey

(Received 23 November 2001; accepted 19 November 2002)

Abstract
Juniperus oxycedrus L. subsp. macrocarpa (Sibth. & Sm.) Ball occurs in the Mediterranean region, on the southern part of Turkey and has been widely used in landscape planning and stabilization of coastal dunes. In this study foliar N and P resorption and foliar N, P and K concentrations (on a leaf mass basis) were investigated in J. oxycedrus subsp. macrocarpa. Foliar N, P, and K concentrations and absolute and proportional N and P resorption rates along the topographic position were not changed significantly. Significant correlations were found between absolute and proportional P resorption rates and soil moisture status. However, there were no significant correlation between absolute and proportional N resorption rates and soil moisture status. Foliar N and proportional N resorption were significantly correlated although absolute N resorption was not significantly correlated with foliar N. However, foliar P was significantly correlated both absolute and proportional P resorption.

Résumé
Résorption foliaire de N, P et niveaux de nutrition chez Juniperus oxycedrus L. ssp. macrocarpa (Sibth. & Sm.) Ball le long d'un gradient altitudinal. Juniperus oxycedrus L. ssp. macrocarpa (Sibth. & Sm.) se rencontre en région méditerranéenne dans le Sud de la Turquie. Il a été largement utilisé pour la stabilisation de dunes côtières et pour l'urbanisation. Dans ce travail, on a étudié chez cette espèce la résorption foliaire de N et P et les concentrations foliaires en N, P et K. Les concentrations foliaires en N, P et K et les taux de résorption (valeurs absolues et relatives) ne varient pas de façon significative avec la position topographique. Des corrélations significatives ont été trouvées entres les valeurs de résorption de P et l'humidité des sols. Cependant, il n'y a pas de corrélation significative entre les taux de résorption de N (valeurs absolues et relatives) et l'humidité des sols. La concentration foliaire en N et la résorption foliaire en N (valeurs relatives) étaient corrélées significativement bien que la résorption de N en valeurs absolues n'était pas corrélée avec la concentration foliaire en N. Pourtant les concentrations foliaires en P étaient significativement corrélées avec les résorptions de P (valeurs absolues et relatives).

Key words: Juniperus oxycedrus L. subsp. macrocarpa (Sibth. & Sm.) Ball / absolute N and P resorption / proportional N and P resorption / Cupressaceae / soil moisture status

Mots clés : Juniperus oxycedrus L. ssp. macrocarpa (Sibth. & Sm.) Ball / résorption de N et P / humidité du sol / Cupressacée

Correspondence and reprints: Hamdi Güray Kutbay
e-mail: hguray@omu.edu.tr

© INRA, EDP Sciences 2003

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