Rp. Guyette et Be. Cutter, BARIUM AND MANGANESE TRENDS IN TREE-RINGS AS MONITORS OF SULFUR DEPOSITION, Water, air and soil pollution, 73(1-4), 1994, pp. 213-223
Barium and manganese concentrations in radial growth increments of hea
rtwood from Juniperus virginiana L. are used to examine changes in soi
l reaction and sulfur deposition. Barium and Mn trends from trees grow
ing on 2 sites with acid, low-Ca soils, signaled sulfur-induced change
s in soil acidity after 1870, while Ba and Mn trends before 1870 did n
ot. Factors controlling Ba availability are hypothesized to have chang
ed from soil acidity before 1870 to precipitation of BaSO4 by increase
d soil sulfate after 1870.