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Long-Term Relationships between Molybdenum and Sulfur Concentrations in Redcedar Tree Rings

School of Forestry, Fisheries and Wildlife, 1-30 Agric. Bldg., Univ. of Missouri, Columbia, MO 65211.

^* Corresponding author.

ABSTRACT

Molybdenum and S concentrations were determined in growth increments of 13 eastern redcedar (Juniperus virginana L.) trees from the Ozark region of Missouri. Chonologies were constructed, which dated from 1280 to 1960 for Mo, and from 1580 to 1960 for S. A 45% increase in Mo concentrations occurred between 1720 and 1860 when compared with the previous 440 yr. A decline in heartwood Mo concentration, beginning in 1860, is hypothesized to be due to increasing soil sulfate from the atmospheric deposition of S compounds. There was a 65% reduction in Mo concentration concomitant with a 44% increase in S concentration in redcedar heartwood formed after 1860. Sulfur and Mo concentrations were found to be negatively correlated in serial heartwood increments. Competition between sulfate and molybdate ions in soil solutions are thought to have decreased Mo in recent heartwood growth increments.

Contribution from Univ. of Missouri School of Forestry, Fisheries and Wildlife, Columbia.

Research supported by USDA Grant 86-CRCR-1-2074. This is Paper No. 10816 in the Univ. of Missouri's Agric. Exp. Stn. Journal Series.

Received for publication October 6, 1988.