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Background and Aims Reduced availability of calcium (Ca) has been linked to maple forest decline. We\udtherefore 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.\ud\udMethods 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.\ud\udResults The L and F horizons contributed most of the leaf Ca of beech and maple with likely small\udcontributions from the upper B and/or H/Ahe horizons. Leaf Ca/Sr ratios of beech were however more\udvariable 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.\ud\udConclusion 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

plant and soil

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