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TECHNICAL REPORTS
Plant and Environment Interactions

Basal Area Growth of Sugar Maple in Relation to Acid Deposition, Stand Health, and Soil Nutrients

Direction de la recherche forestière, Forêt Québec, ministère des Ressources naturelles du Québec, 2700, rue Einstein, Sainte-Foy, QC, Canada G1P 3W8

* Corresponding author (louis.duchesne{at}mrn.gouv.qc.ca)

Received for publication April 26, 2001. Previous studies have shown in noncalcareous soils that acid deposition may have increased soil leaching of basic cations above the input rate from soil weathering and atmospheric depositions. This phenomenon may have increased soil acidity levels, and, as a consequence, may have reduced the availability of these essential nutrients for forest growth. Fourteen plots of the Forest Ecosystem Research and Monitoring Network in Québec were used to examine the relation between post-industrial growth trends of sugar maple (Acer saccharum Marsh.) and acid deposition (N and S), stand decline rate, and soil exchangeable nutrient concentrations. Atmospheric N and S deposition and soil exchangeable acidity were positively associated with stand decline rate, and negatively with the average tree basal area increment trend. The growth rate reduction reached on average 17% in declining stands compared with healthy ones. The results showed a significant sugar maple growth rate reduction since 1960 on acid soils. The appearance of the forest decline phenomenon in Québec can be attributed, at least partially, to soil acidification and acid deposition levels.

Abbreviations: BAI, basal area increment • BS, base saturation • DBH, tree diameter at breast height • RESEF, Forest Ecosystem Research and Monitoring Network (Réseau d'étude et de surveillance des écosystèmes forestiers)

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