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Extractability of Elements in Sugar Maple Xylem along a Gradient of Soil Acidity

^a Environment Canada, 105 McGill St., Montreal, QC, H2Y 2E7, Canada
^b Dép. des Sciences Biologiques, Faculté des sciences, Université du Québec à Montréal, C.P. 8888, Succursale Centre-Ville, Montreal, QC, H3C 3P8, Canada
^c Direction de la Recherche Forestière, Forêt Québec, Ministère des Ressources Naturelles et de la Faune du Québec, 2700 rue Einstein, Sainte-Foy, QC, G1P 3W8, Canada
^d Dep. of Natural Resource Sciences, Macdonald Campus of McGill Univ., 21,111 Lakeshore Rd., Ste.-Anne-de-Bellevue, QC, H9X 3V9, Canada

View larger version (13K): [in this window] [in a new window]   Fig. 1. Reaction kinetics from H2O and HCl extractions for a few key elements. Values are means, and error bars are ranges (max minus min) from three replicates.

View larger version (41K): [in this window] [in a new window]   Fig. 2. Radial (temporal) trends of element concentrations in tree wood and distribution among fractions. Values are means, and error bars are SE (n = 9 trees for residual; n = 8 for water-soluble and acid-soluble from all three sites combined). The "total fraction" refers to the sum of the three distinct fractions. The vertical broken line is the heartwood–sapwood boundary.

View larger version (35K): [in this window] [in a new window]   Fig. 3. Comparison of average sapwood concentrations between sites (n = 3 for Clair and Duchesnay; n = 2 for Laurent) and for each fraction (H2O = water-soluble, HCl = acid-soluble, HNO3 = residual, TOTAL = sum of all fractions). Sites are ranked (left to right) from least to most acid. Bars with different letters indicate that means were significantly different (p < 0.05) according to Tukey-Kramer's honest significant difference.