Abstract
Boron is present in many household, industrial, and municipal products and by-products. Uncontrolled release of boron-containing materials into wetland environments could cause toxicity in bottomland and swamp tree species. To test this hypothesis, boron was added to 10-liter pots containing seedlings ofBetula nigra, Nyssa sylvatica var. biflora, Nyssa aquatica, Platanus occidentalis, Taxodium distichum, Quercus alba, Q. falcata var. pagodaefolia, Q. nigra, Q. michauxii, and Q. phellos at rates of 0, 2, 4, 8, and 16 mg/L, and the seedlings grown for four months. Elemental leaf concentrations, growth, and biomass were determined. Boron concentration in leaves was linearly related to boron addition. The highest boron treatment significantly decreased growth forB. nigra, N. aquatica, P. occidentalis, andT. distichum. Platanus occidentalis had the highest boron recovery (23% at 4 mg/L), whileT. distichum had the most consistent recovery (11–13%) over all treatments. Although leaf damage was severe in the oaks, there were no significant differences in growth parameters between the control and boron treatments. This is attributed to the determinate growth of the oaks and possibly the short duration of the study.
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