Can tree-ring δ15N be used as a proxy for foliar δ15N in European beech and Norway spruce?

Tomlinson G, Buchmann N, Siegwolf R, Weber P, Thimonier A, Pannatier EG, Schmitt M, Schaub M & Waldner P
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Tomlinson, G., Buchmann, N., Siegwolf, R., Weber, P., Thimonier, A., Pannatier, E. G., … Waldner, P. (2016). Can tree-ring δ15N be used as a proxy for foliar δ15N in European beech and Norway spruce? Trees: Structure and Function, 30(3), 627-638. https://doi.org/10.1007/s00468-015-1305-1