Partitioning of the source of leaf calcium of American beech and sugar maple using leaf Ca/Sr ratios: A predominantly surficial but variable depth of Ca uptake [r-libre/435]

Chen, Ching-Chih; Beauregard, Frieda; Côté, Benoît; Bélanger, Nicolas; Courchesne, François et Hendershot, William H. (2013). Partitioning of the source of leaf calcium of American beech and sugar maple using leaf Ca/Sr ratios: A predominantly surficial but variable depth of Ca uptake. Plant and Soil, 373 (1-2), 229-242. https://doi.org/10.1007/s11104-013-1787-9

Fichier(s) associé(s) à ce document :

PDF - Chen et al 2013.pdf
Contenu du fichier : Manuscrit accepté (révisé après évaluation)

Télécharger

Catégorie de document :	Articles de revues
Évaluation par un comité de lecture :	Oui
Étape de publication :	Publié
Résumé :	Background and Aims Reduced availability of calcium (Ca) has been linked to maple forest decline. We therefore aimed at assessing the contribution of the different soil horizons to leaf Ca of competing beech (Fagus grandifolia Ehrh.) and sugar maple (Acer saccharum Marsh.) to better understand the dynamics of Ca uptake. Methods Leaf Ca was partitioned using the Ca/Sr ratio approach in two mature forests of southern Quebec. A mass balance was also used at one site to validate the results obtained with the Ca/Sr approach. Results The L and F horizons contributed most of the leaf Ca of beech and maple with likely small contributions from the upper B and/or H/Ahe horizons. Leaf Ca/Sr ratios of beech were however more variable than those of maple. Using a mass balance, the organic horizons and upper mineral soil horizons were found to provide ca. 80 and 20%of tree Ca uptake, respectively. Conclusion Beech and maple Ca uptake depth apportionment is on average similar but beech is likely more plastic in sourcing soil Ca. The low contribution of the mineral soil to leaf Ca at our sites can be linked to less favorable conditions for Ca uptake likely associated with low Ca/Al ratios.
Adresse de la version officielle :	http://link.springer.com/article/10.1007/s11104-01...
Déposant:	Bélanger, Nicolas
Responsable :	Nicolas Bélanger
Dépôt :	26 oct. 2014 19:27
Dernière modification :	16 juill. 2015 00:46

Actions (connexion requise)

RÉVISER