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Concentration of Micronutrients in Foliage of Three Coniferous Tree Species in British Columbia¹

ABSTRACT

Foliage samples were secured from the upper-one third of the crowns of Douglas fir (Pseudotsuga taxifolia P.), lodgepole pine. (Pinus contorta D.), and western hemlock (Tsuga heterophylla R.) trees. Needles of the 1961, 1962, and 1963 growth were obtained with the exception of western hemlock samples at Gold River where only the current growth was collected. The needles were analyzed for the micronutrients B, Cl, Co, Cu, Fe, Mn, Mo, and Zn and for the apparently nonessential elements Al and Si.

The ranges in concentration of B, Cl, Co, Cu, Fe, Mn, Mo, Zn, Al, and Si encountered in the various needle samples were: 2.5–17.0, 73–170, 0.05–0.46, 2.1–5.6, 38.6–68.3, 293–1982, < 0.5–0.10, 3.0–52.3, 175–787, and <467–8700 ppm in the dry matter, respectively. Manganese occurred in greater amounts than any of the other 7 micronutrients. Concentration of Fe, Mn, Al, and Si generally increased with age of needles. Levels of Mn, and Al tended to be higher in needles of western hemlock than in Douglas fir. Western hemlock needles contained much less Si than Douglas fir needles.

¹ Contribution from Research and Corporate Development, Technical Research, The Consolidated Mining and Smelting Company of Canada Ltd. (Cominco), Trail, B.C.; Pacific Logging Company Ltd., Victoria, B.C.; Crown Zellerbach Canada Ltd., Vancouver, B.C.; Forest Division, S. M. Simpson Ltd., Kelowna, B.C.; and Forestry Division, Tahsis Company, Ltd., Gold River Logging, Gold River, B.C. All chemical analyses were carried out by the Cominco Tadanac Analytical Laboratory. Mr. A. Green, Canada Dept. of Agr., Vancouver, B.C., provided valuable assistance in identification of some of the soils. Portions of these results were presented before the Western Society of Soil Science, June 24, 1964, at Vancouver, B.C.

² Head, Soil Science Research, Cominco; Development Analyst, Cominco; Research Assistant, Cominco; Forester, Pacific Logging Company Ltd.; Chief Forester, Crown Zellerbach Canada Ltd.; Woodlands Manager, Forest Division, S. M. Simpson Ltd.; and Resident Forester, Forestry Division, Tahsis Company, Ltd., Gold River Logging, respectively.

Received for publication July 2, 1964. Accepted for publication January 14, 1965.