On the copper content of some northern conifers

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Abstract
New analyses of pine, spruce, fir, larch, and red maple tissue from the Tantramar Copper Swamp, New Brunswick, fail to confirm the exceptional high copper contents previously reported from this location. Foliar contents did not differ from those of nearby controls, and contents in 1st- and 2nd-year twigs were only two to three times higher than in controls, still within the normal range of values in the literature. In contrast, bulk samples of fine roots from the swamp contained over 2000 ppm Cu. Parallel comparisons of hemlock growing on Cu-enriched mineral soils from Long Island, New York, revealed that root Cu increased linearly with extractable soil content, whereas foliar Cu was unaffected. Thus, it appears that roots and twigs may be better indices of plant Cu status than foliage.

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